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RT420GPS-Based Time Reference

Reference Manual

Reason Tecnologia S.A.

Rua Delminda Silveira, 85588025-500 Florianopolis, SC

Brasil

Fone: (48) 2108-0300Fax: (48) 2108-0310

http://www.reason.com.br

Reason International, Inc.

7101 W Highway 71Austin, TX 78735

USA

Phone: (512) 615-0490Fax: (512) 615-0491

http://www.reason-international.com

Reason Europe GmbH i. G.

Ascherslebener Strae 3D-06333 Hettstedt

Deutschland

Telefon: +49 (0)3476 559345Fax: +49 (0)3476 559286

http://www.reason-europe.com

Applicable models: P025-Axx/1 P025-Axx/2P025-Axx/4 P025-Axx/5P025-Axx/6 P025-Axx/7

Firmware version: 08Axx

Document Id: rt420-manual-enRevision: 4.1

c© 2008, 2009 Reason Tecnologia S.A.All rights reserved.

Products developed by REASON are continuously improved and the associatedtechnical documentation is frequently updated. Please make sure you have thelatest release of this document before proceeding. All specifications are subjectto change without prior notice.

9001DIN EN ISO

Reason is committed to quality. Certifica-tion to the CE and the ISO 9001:2000 qual-ity standard are examples of this commit-ment. We encourage and appreciate anyfeedback and will use it to improve our prod-ucts and services.

Contents

Contents i

1 Safety Instructions 1

1.1 General Safety Instructions . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 1

1.2 Passwords and Remote Access . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 1

1.3 Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 1

2 Getting Started 3

2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 3

2.2 Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 3

2.3 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 4

2.4 Serial Number and Part Number Location . . . . . . . . . . . . . . .. . . . . . . . . . . 4

2.5 Powering-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 5

3 Specifications 7

3.1 GPS input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 7

3.2 IRIG-B000 optical input (optional) . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 7

3.3 Internal oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 7

3.4 TTL-level electrical outputs . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 7

3.5 Open-collector outputs . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 8

3.6 Optical outputs (optional) . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 8

3.7 Amplitude-modulated outputs . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 8

3.8 RS232 serial port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 8

3.9 Ethernet port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 8

3.10 LOCKED dry contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.11 Dimensions, weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 9

3.12 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 9

3.13 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 9

3.14 Type tests (EMC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 10

i

ii CONTENTS

3.15 Type tests (safety) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 10

3.16 Type tests (environmental) . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 10

3.17 Type tests (mechanical) . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 10

4 Installation 11

4.1 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 11

4.2 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 11

4.3 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 11

4.4 Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 13

4.5 Antenna Cable Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 14

4.6 Optical IRIG-B000 Input . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 15

4.7 Optical Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 16

4.8 TTL-level Electrical Outputs . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 16

4.9 Open Collector Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 17

4.10 Amplitude-Modulated Outputs . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 18

4.11 RS232 Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 18

4.12 Ethernet Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 19

4.13 Locked Dry Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 19

5 Operation 21

5.1 Front Panel Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 21

5.2 Power-Up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 22

5.3 Power-Down Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 22

6 Configuration 23

6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 23

6.2 Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 23

6.3 Running TELNET from Windows . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 23

6.4 Running SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 24

6.5 Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 24

6.6 Behavior during configuration . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 24

6.7 Configuration Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 25

7 ASCII Commands 27

7.1 Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 27

7.2 Command History and Editing . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 27

7.3 Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 28

iii

8 Datagrams 53

8.1 ACEB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 54

8.2 GPZDA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 55

8.3 MEINBERG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 56

9 Maintenance and Troubleshooting 57

9.1 Common Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 57

9.2 Forgotten Password or Unknown Network Parameters . . . . .. . . . . . . . . . . . . . . 58

9.3 CMOS Clock Battery Replacement . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 59

9.4 Returning a Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 59

Part Numbers 61

Modbus Interface 63

Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 63

Message Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 63

Implemented Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 63

Function 4 (Read Input Registers) . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 64

Registers Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 65

Summary of IRIG-B Standard 69

IRIG-B000 and IRIG-B120 Contents . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 69

1 Safety Instructions

1.1 General Safety Instructions

Before attempting to install or use the equipment describedin this manual, it is imperative that allDANGER

andCAUTION warnings are reviewed to help prevent personal injury, equipment damage and/or downtime.

This manual is intended for technically qualified personnelwhich has been trained or is knowledgeable ininstrumentation and automation fields.

This instruction manual is an integral part of the scope of delivery and provides basic instructions forinstallation, configuration, operation and maintenance ofthe equipment here described. Shall additionalinformation be needed, please contact REASONat the addresses provided at the beginning of this document.

1.2 Passwords and Remote Access

This equipment is delivered with factory-default passwords. This passwords should be changed by the useras part of equipment installation and initial configuration. Failure to do so may result in unauthorized accessto the equipment.

1.3 Safety Symbols

The following symbols are located on different parts of the units housing and in this manual.

Paragraphs marked with this symbol contain informationwhich, if not properly followed, may cause damage to theequipment and/or installation.Paragraphs marked with this symbol contain informationwhich, if not properly followed, may cause personal in-jury or even death.

Safety ground.

1

2 Getting Started

2.1 Overview

RT420 provides time, frequency and phase reference signalsvia configurable electrical, optical and logicaloutput ports. Time information is provided by a built-in GPSreceiver or an external IRIG-B000 source.

Time information is shown on a display and output in a varietyof formats including a DC-shift andamplitude-modulated IRIG-B signal, RS232C serial datagrams, and several types of time pulses. Accu-racy of the internal time-base is better than 100 ns (1 sigma).

The RT420 time reference is able to produce time informationreferred to UTC or to a local time-zone.Support for Daylight Saving Time is also provided.

The unit is intended for 19-inch rack-mounting and can be powered from a wide range of AC and DC powersources.

RT420 front and back views

2.2 Key Features

• 100 ns (1 sigma) maximum time deviation

• Built-in NTP and SNTP servers using 10/100Base-T Ethernet port

3

2. GETTING STARTED

• IRIG-B000 and IRIG-B120 time codes

• 100 pulses-per-second, 1 pulse-per-second, 1 pulse-per-minute signals

• Freely configurable low frequency pulse generator from 1 pulse-every-two-seconds to 1 pulse-every-24-hours

• Pulse-on-time and pulse-on-date signals (daily repetition or not)

• 8 optical fiber outputs (optional)

• 8 TTL-level electrical outputs, normal or inverted polarity

• 3 open-collector outputs, normal or inverted polarity

• 2 IRIG-B120 outputs modulated in amplitude

• RS232 serial port with PPS signal (normal or inverted polarity), freely configurable messages

• Status monitoring using SNMP or Modbus

• “Locked” dry contact for remote signalling

• User-configurable rules for daylight-saving-time (DST)

• Uses GPS satellites or external IRIG-B000 (optional) as time basis

• Time delay compensation for antenna cables and optical-fiber cables

• Configurable over Ethernet using SSH or TELNET protocols

2.3 Unpacking

Unpack the unit carefully and make sure that all accessoriesand cables are put aside so they will not be lost.

Check the contents against the packing list. If any of the contents listed are missing, please contact REASON

immediately (see contact information at the beginning of this manual).

Examine the unit for any shipping damage. If the unit is damaged or fails to operate, notify the shippingcompany without delay. Only the consignee (the person or company receiving the unit) can file a claimagainst the carrier for shipping damage.

We recommend that you retain the original packing materialsfor use should you transport or ship the unitin the future.

2.4 Serial Number and Part Number Location

The unit’s serial number and part number are engraved on a small nameplate, located on the unit’s rightside, near the MAINS terminal.

Serial number and part number location

For information about how to interpret the part number, refer to page 61.

4

Powering-Up

2.5 Powering-Up

1. Be sure you are familiar with all appropriateDANGER andCAUTION warnings in this manual.

2. Refer to Chapter 4 for detailed mounting and wiring instructions. Do not operate the unit without thesafety ground connection in place.

3. Make sure the power switch at the back of the unit is in the OFF position.

4. [OPTIONAL] Connect a GPS antenna to the unit. Refer to section 4.4 for further information aboutantenna positioning and requirements.

5. Connect power to the unit. The MAINS indicator on the unit’s front panel will light immediately.

6. Power on the unit using the switch on the back panel.

7. A self-test will be executed, blinking all indicators except MAINS on the front panel twice.

8. The unit will now initialize the internal time-references, including the GPS receiver. This will takeup to one minute. Progress is indicated by successively lighting up the segments of the time displayon the front panel.

9. As soon as initialization is complete, the READY indicator will light up and the internal time will bedisplayed on the front panel.

10. If an antenna is connected to the unit, the LOCKED indicator will start blinking after a few minutes,indicating that the time produced by the unit is being derived from the GPS satellites. The LOCKED

indicator will stop blinking and stay on once full accuracy is achieved.1 A clear line-of-sight fromthe antenna to at least 4 GPS satellites is required for the unit to enter the locked state.

11. Factory defaults for Ethernet port are listed below.

IP address 192.168.0.199Network mask 255.255.255.0

Broadcast address 192.168.0.255Gateway address 192.168.0.1

Password cond3e89

Should this parameters not be appropriate for the installation, use across-over Ethernet cable toconnect the unit to a computer and change the parameters as needed with theETHER command(refer to page 35 for further details).

12. Shall the unit fail to operate as described, carefully review the power and all signal connections. Referto Chapter 9 for further help on troubleshooting.

13. To switch the unit off, flip the power switch to the OFF position. The unit will record date, time,satellite almanach and internal drift estimates in non-volatile memory so as to increase accuracy andreduce locking time at the next power up. After recording is finished, all indicators except MAINS onthe front panel will be turned off.

1This may take up to the 12 minutes if the unit has been moved over great distance since last powered off or if the unit has beenoff for several weeks.

5

3 Specifications

3.1 GPS input

Signal GPS L1 (1575.42 MHz), C/A codeNumber of channels 12Antenna type activeAntenna power 3.3 V, max 100 mAInput impedance 50ΩConnector type BNC (female)Sensitivity -152 dBm (tracking)

-142 dBm (acquisition)

3.2 IRIG-B000 optical input (optional)

Signal IRIG-B000 (with IEEE C37.118 CF extensions)Wavelength 820 nmFiber type 50/125µm, 62.5/125µm, 100/140µm or 200µm HCS

multimodeConnector type STSensitivity −24 dBm

3.3 Internal oscillator

Drift (free run) < 1 ppm (10−6)Time error (free run) < 100 ms per day

3.4 TTL-level electrical outputs

Signals IRIG-B000 (with IEEE C37.118 CF extensions), 1PPS,100PPS, 1PPM, low frequency pulses (from 1 pulse-every-two-seconds to 1 pulse-every-24-hours), pulse-on-time and pulse-on-date

“High” level voltage > 4 V“Low” level voltage < 0.2 VMaximum current 80 mAOutput impedance 15Ω

7

3. SPECIFICATIONS

3.5 Open-collector outputs

Signals IRIG-B000 (with IEEE C37.118 CF extensions), 1PPS,100PPS, 1PPM, low frequency pulses (from 1 pulse-every-two-seconds to 1 pulse-every-24-hours), pulse ontime and pulse on date

Maximum collector-emitter voltage 150 VMaximum current 200 mA

3.6 Optical outputs (optional)

Signal IRIG-B000 (with IEEE C37.118 CF extensions)Wavelength 820 nmFiber type 50/125µm, 62.5/125µm, 100/140µm or 200µm HCS

multimodeConnector type STOutput power (typical) −17.8 dBm (50/125µm)

−14.0 dBm (62.5/125µm)−8.5 dBm (100/140µm)−5.7 dBm (200µm HCS)

3.7 Amplitude-modulated outputs

Signal IRIG-B120 (with IEEE C37.118 CF extensions)No-load voltage 4 VppVoltage with 50Ω load 3 VppHigh/low amplitude ratio 3.33Carrier frequency 1 kHzOutput impedance 15ΩConnector type BNC (female)

3.8 RS232 serial port

Signal level RS232Bitrate 1200, 2400, 4800, 9600, 19200 or 38400 bpsDatabits 7 or 8Stopbits 1 or 2Parity none, even, oddConnector type DB9 (male), DTE layout

3.9 Ethernet port

Data rate 10 / 100 MbpsConnector type RJ 45Protocols NTP, SNTP, SNMP, Modbus, SSH, TELNET

8

LOCKED dry contact

3.10 LOCKED dry contact

Rating 300 mA @ 250 Vdc1000 mA @ 125 Vdc

3.11 Dimensions, weight

Height 1 UWidth (body) 430 mm (16.9 in)Depth 180 mm (7.1 in)Weight 2.7 kg (5.9 lbs)

3.12 Power

Rated operating voltage 100–250 Vdc, 110–240 VacInput voltage range 80–275 Vdc, 88–264 VacFrequency 50/60 Hz±3 HzPower consumption < 15 VA (AC)

3.13 Environmental

Temperature range (recommended)+5 . . .+55 C (+41 . . .+131 F)Temperature range (tested) −25 . . .+70 C (−13 . . .+158 F)Enclosure protection IP40Maximum altitude 2000 m (6560 ft)Relative humidity 5 . . . 95%, noncondensing

9

3. SPECIFICATIONS

3.14 Type tests (EMC)

IEC 61000-4-2 Electrostatic discharge 6 kV (contact), 8 kV (air)IEC 60255-22-2

IEC 61000-4-3 Radiated RF immunity 10 V/mIEC 60255-22-3

IEC 61000-4-4 Burst 2 kVIEC 60255-22-4

IEC 61000-4-5 Surge 2 kV (common mode)IEC 60255-22-5 1 kV (diferential mode)

IEC 61000-4-6 Conducted RF immunity 10 VIEC 60255-22-6

IEC 61000-4-8 Magnetic field immunity 30 A/m

IEC 61000-4-11 Voltage dips 0 % during 0.5 cycles, 0 and 180 degrees0 % during 1 cycle40 % during 10/12 cycles70 % during 25/30 cycles80 % during 250/300 cycles

IEC 60255-22-1 Burst 1 MHz 2.5 kV (common mode)1 kV (differential mode)

IEC 60255-25 Conducted RF emission 0.15 MHz to 0.5 MHz: 79 dB /66 dBCISPR-22 0.5 MHz to 30 MHz: 73 dB / 60 dB

Radiated RF emission 30 MHz to 230 MHz: 40 dB230 MHz to 1000 MHz: 47 dB

3.15 Type tests (safety)

IEC 60255-5 Dielectric test 2.8 kVDC @ 1 min5 kV impulse

Insulation resistance > 100 MΩ @ 500 VDC

IEC 61010-1 Safety tests

3.16 Type tests (environmental)

IEC 60068-2-1 Cold −25 C, 16 hours, 1 cycle

IEC 60068-2-2 Dry heat +70 C, 16 hourss, 1 cycle

IEC 60068-2-14 Change of temperature −25 C . . .+70 C, 9 hours, 2 cycles

IEC 60068-2-30 Damp heat +55 C, 95 %, 12+12 hours, 1 cycle

3.17 Type tests (mechanical)

IEC 60068-2-6 Vibration (sinusoidal) 0.035 mm, 0.5 g, 1 cycle on each axisIEC 60255-21-1 1 g, 20 cycles on each axis

IEC 60068-2-27 Shock 15 g, 11 ms, 3 pulses on each faceIEC 60255-21-2

10

4 Installation

Please refer to the figure below throughout this chapter.

RT420 back view

4.1 Mounting

RT420 has been designed to be mounted in a standard 19-inch rack by means of four M6x15 screws. Allowadequate clearance for all connections.

Do not bend the antenna cable excessively since this might alter its impedance, degrading the units perfor-mance.

4.2 Environment

Temperatures inside the rack should not not exceed the limits stated in section 3.13. Appropriate heating orcooling measures must be provided to guarantee that this requirement is met at all times.

Air humidity should respect the limits described in section3.13.

4.3 Power Connection

The unit can be powered from DC or AC power within the limits specified in section 3.12.

All power connections should use insulated flexible cable with a 1.5 mm2 cross section attached to thesupplied header connector.

To reduce the risk of electrical shock, pre-insulated pin terminals should be uses on the ends of the powerconnections.

11

4. INSTALLATION

Pre-insulated pin terminals

The pin terminals should be completely inserted into the header connector supplied with the unit so that nometallic parts are exposed. Refer to the figure below.

Header connector assembly

A safety ground lead shall be connected to the terminal marked with the protective earth symbol.

For better electromagnetic compatibility, ground the unitusing a 10 mm (0.4 in) wide grounding strap toconnect the rear panel of the unit to a good ground point on themounting rack.

AC Power Connection

Phase should be applied to terminal “1”, neutral to terminal“2”.

AC power connection

Installation of an external 10 A, category C, unipolar circuit-breaker near the unit is recommended. Thecircuit breaker should have an interruption capacity of at least 25 kA and comply to IEC 60947-2.

12

Antenna

DC Power Connection

Positive should be applied to terminal “1”, negative to terminal “2”.

DC power connection

Installation of an external 10 A, category C, bipolar circuit-breaker near the unit is recommended. Thecircuit breaker should have an interruption capacity of at least 25 kA and comply to IEC 60947-2.

4.4 Antenna

A 3.3-Volt active GPS antenna (100 mA max) must be connected to the ANTENNA terminal if GPS satellitesare to be used as time reference. Refer to section 3.1 for additional information.

There is no need to connect an antenna if the unit is to be operated as a time repeater. In this case, theoptical IRIG-B000 shall be used (refer to section 4.6 for further information).

Antenna connector

The antenna must be mounted outdoors, in a vertical position, with an unobstructed view of the sky. Theantenna should be placed above the height of the building as much as possible. A partially obstructed skyview will degrade the units performance.

The antenna should not be located under overhead power linesor other electric light or power circuits, orwhere it can fall into such power lines or circuits.

An antenna mast or roof-mounting-kit and any supporting structure must be properly grounded to provideprotection against voltage surges and built-up static charges.

The antenna has to be connected to the unit using a coaxial cable with a 50Ω impedance. The antena cableshould be routed trough a conduit, shielded from rain and solar radiation. The conduit should not be sharedwith any power cabling.

Cables with lengths ranging from 15 m (50 ft) to 100 m (328 ft) are available from REASON. Contact

13

4. INSTALLATION

REASON for further information on using third-party antennas and cables.

4.5 Antenna Cable Effects

The GPS signal is attenuated before reaching the RT420 antenna input. If the attenuation is excessive, thesignal strength may not be sufficient to lock to the GPS satellites.

The GPS signal is also slightly delayed. If the ultimate timeaccuracy is desired, this delay should becompensated inside the unit.

Attenuation

GPS signal attenuation is a function of cable type and overall cable length. When using the active antennasupplied by REASON, total attenuation should not exceed 32 dB.

Total attenuation can be computed using

A = Au × l

whereAu is the attenuation per unit length for the given cable andl is the overall cable length.

The table below shows a few typical cable configurations and the associated total attenuation.

Cable Length RGC58 cable RGC8 cable

15 m (50 ft) 7 dB —25 m (82 ft) 12 dB —

50 m (164 ft) 23 dB —75 m (246 ft) — 12 dB

100 m (328 ft) — 17 dB125 m (410 ft) — 21 dB150 m (492 ft) — 25 dB

Propagation Delay

The cable delays the GPS signal. If the ultimate time accuracy is desired, this delay has be compensatedinside the unit.

Typically, the delay introduced by coaxial cables is in the magnitude of 4 ns/m (1.2 ns/ft) of cable length.

The exact delay can be computed by

T =1

CKv

× l

whereC = 3× 108 m/s is the light speed,Kv = 0.8 to 0.85 is a constant which depends on the cable andl

is the cable length in meters.

The table below summarizes some typical delays introduced by coaxial cables

14

Optical IRIG-B000 Input

Cable Length Typical Delay

15 m (50 ft) 60 ns25 m (82 ft) 100 ns

50 m (164 ft) 200 ns75 m (246 ft) 300 ns

100 m (328 ft) 400 ns125 m (410 ft) 500 ns150 m (492 ft) 600 ns

Delays of up to 10µs can be compensated with theDELAY ASCII command (see page 32).

4.6 Optical IRIG-B000 Input

The IRIG-B000 optical input should be used when the unit is operated as a time repeater.

There is no need to use this input if the unit is to be operated using GPS sattelites in which case theANTENNA input should be used instead (refer to section 4.4 for further information).

The optical IRIG-B000 is not available on all RT420 models. Please refer to the unit’s part number to findout if the model you are using supports this feature. Furtherinformation on how to interpret the part numbercan be found on page 61.

Optical IRIG-B000 input

For correct operation, the IRIG-B000 signal applied to thisinput should use theControl Field extensions asdefined in the IEEE C37.118 Standard. Particularly, the time-offset information is needed to convert localtime to UTC.

Propagation Delay

The optical fiber cable used to carry the IRIG-B000 signal to the RT420 introduces a significant delay. Ifthe ultimate time accuracy is desired, this delay has be compensated inside the unit.

Typically, the delay introduced by multimode optical fiber cables is in the magnitude of 5 to 6 ns/m (1.5 to1.8 ns/ft).

The following table summarizes some typical optical cable delays

15

4. INSTALLATION

Optical Fiber Length Typical Delay

100 m (328 ft) 500 . . . 600 ns250 m (820 ft) 1.25 . . . 1.50µs

500 m (1640 ft) 2.50 . . . 3.00µs750 m (2460 ft) 3.75 . . . 4.50µs

1000 m (3280 ft) 5.00 . . . 6.00µs1250 m (4100 ft) 6.25 . . . 7.50µs1500 m (4920 ft) 7.50 . . . 9.00µs

Delays of up to 10µs can be compensated with theDELAY ASCII command (see page 32).

4.7 Optical Outputs

The optical outputs are not available on all RT420 configurations. Please refer to the unit’s part number tofind out if the model you are using supports this feature. Further information on how to interpret the partnumber can be found on page 61.

Optical outputs

The signal present at this outputs is IRIG-B000 with CF extensions according to the IEEE C37.118 Stan-dard.

4.8 TTL-level Electrical Outputs

Length of cables connected to this outputs should not exceed5 m (16 ft). Refer to section 3.4 for signallevels and maximum load information.

TTL-level electrical outputs

The type of signal at each output can be configured with theOUTPUT command (page 40). Options includeIRIG-B000, 1PPS, 1PPM, 100PPS, a custom-defined low frequency, pulse-on-time and pulse-on-date.

16

Open Collector Outputs

The polarity of the signal at each output can be individuallyconfigured with thePOLARITY command(page 42).

For the 1PPS, 1PPM, custom-defined low-frequency, pulse-on-time and pulse-on-date signals, the width ofthe pulse can be configured with theWIDTH command (page 51).

4.9 Open Collector Outputs

Length of cables connected to this outputs should not exceed5 m (16 ft). Refer to section 3.5 for signallevels and maximum load information.

Open-collector outputs

The type of signal at each output can be configured with theOUTPUT command (page 40). Options includeIRIG-B000, 1PPS, 1PPM, 100PPS, a custom-defined low frequency, pulse-on-time and pulse-on-date.

The polarity of the signal at each output can be individuallyconfigured with thePOLARITY command(page 42).

For the 1PPS, 1PPM, custom-defined low-frequency, pulse-on-time and pulse-on-date signals, the width ofthe pulse can be configured with theWIDTH command (page 51).

The open-collector outputs are unfused and require an external resistor to limit the current that circulatesthrough the transistors.

The resistor’s value can be computed by

Rc ≥Vc

0.2

whereVc is the voltage being switched by the transistor.

The power rating of the resistor has to be adequate for the voltage and current applied and can be computedby

Pc ≥ 1.2 ×V 2

c

Rc

Do not connect the open-collector outputs without limitingthe current with an external resistor. Failure todo so will result in damage to this outputs.

17

4. INSTALLATION

4.10 Amplitude-Modulated Outputs

Use coaxial cables with an impedance of 50Ω and BNC on this outputs. Refer to section 3.7 for signallevels.

Amplitude-modulated outputs

Signal at this outputs is IRIG-B120 with CF extensions according to the IEEE C37.118 Standard.

4.11 RS232 Serial Port

This is a DB9 male connector with a DTE pin-layout.

RS232 serial port

The bitrate and format (number of data bits, parity, number of stop bits) of the characters sent out of thisport can be configured with theSERIAL command (page 44).

Several built-in datagrams can be selected with theDATAGRAM command (page 30) or a custom-definedone can be configured with theASCII-DATAGRAM command (page 29).

A one pulse-per-second pin is also provided. Polarity of thePPS signal can be configured with thePO-LARITY command (page 42) and the pulse width can be adjusted with theWIDTH command (page 51).

18

Ethernet Port

4.12 Ethernet Port

Connect a CAT5 cable with an RJ45 connector to the Ethernet port. The LINK led indicates that the cableis “live” and the ACTIVITY led blinks when there is a data exchange.

Ethernet port

Use theETHER command (page 35) to configure the IP address, the network mask and the broadcast andgateway addresses.

4.13 Locked Dry Contact

This dry contact can be used for remotely signaling the LOCKED state of the unit.

Length of cables connected to this terminals should not exceed 5 m (16 ft). Refer to section 3.10 forinformation on load switching limitations.

Locked dry contact

19

5 Operation

5.1 Front Panel Indicators

RT420 front panel

The RT420’s front panel has a time display, three green status indicators and three red alarm indicators.

Time Display

The time display always shows local time in a 24 hour format. If no valid time is available the display willshow ‘–:–:–’. This situation occurs during the unit’s initialization, during a configuration session or if theinternal CMOS clock battery is exhausted.

The time display might also briefly display ‘–:–:–’ when locking to GPS satellites or an external IRIG-B000time reference if a time-step occurs.

Status Indicators (Green)

These section comprises three indicators.

The MAINS indicator is lit whenever power is applied to the unit, even when it is switched off.

The READY indicator is lit as soon as the unit has completed its internal initialization.

The LOCKED indicator is lit when the unit has locked to an external time-reference (GPS satellites orIRIG-B000 optical input). It blinks while downloading almanach data from GPS satellites.1 It goes offsoon after the external reference is lost. There is a LOCKED dry contact on the unit’s back panel that closesonce full accuracy is achieved.

Alarm Indicators (Red)

These section also comprises three indicators.

The ANTENNA SHORT indicator lits up if the power consumption on the ANTENNA connector exceeds150 mA. This is normally associated with a short-circuit on the antenna itself, one of the connectors or the

1This is only noticed if the unit has been moved over great distance since last powered off or if it has been off for several weeks.

21

5. OPERATION

coaxial cable leading up to the antenna. This indicator is blanked out when the IRIG-B000 optical input isused as a time reference.

The ANTENNA OPEN indicator lits up when no current is drawn from the ANTENNA connector on theunit’s back panel. This is the case when no antenna is connected or if the cable leading up to the antenna isbroken. This indicator is blanked out when the IRIG-B000 optical input is used as a time reference.

The ALARM indicator lits up during power-up when the internal CMOS clock battery is exhausted. Referto Chapter 9 for instructions on replacing the battery. As a workaround until the battery is replaced, thecommandDATE can be used to allow the initialization to proceed.

5.2 Power-Up Sequence

The MAINS indicator is lit as soon as power is applied to the unit. Afterswitching the unit on, a briefself-test will be executed, blinking all indicators (except MAINS) on the front panel twice.

The unit will now initialize the internal time-references,including the GPS receiver. This will take up toone minute. Progress is indicated by successively lightingup the segments of the time display on the frontpanel.

As soon as initialization is complete, the READY indicator will lit up and the internal time will be displayedon the front panel.

If the initialization fails, the time display will show ‘Error’. In this case, refer to Chapter 9 for furtherhelp.

If the internal CMOS clock battery is exhausted, the ALARM indicator will lit up and the time display willshow ‘–:–:–’. The unit will only proceed on the power-up sequence after date and time are manually enteredwith theDATE command. Refer to Chapter 9 for instructions on how to replace the battery.

If an antenna is connected to the unit, the LOCKED indicator will start blinking after a few minutes, indicat-ing that the time produced by the unit is being derived from the GPS satellites. The LOCKED indicator willstop blinking and stay on once full accuracy is achieved. This may take up to the 12 minutes if the unit hasbeen moved over great distance since last power off or if the unit has been off for a very long time. A clearline-of-sight from the antenna to at least 4 GPS satellites is required for the unit to enter the locked state.

Alternatively, the LOCKED indicator will lit soon after a valid signal is applied to theIRIG-B000 opticalinput and theTIME-REFERENCE IRIGB command is issued to the unit.

5.3 Power-Down Sequence

After the power switch is turned to the ‘OFF’ position, the unit will record date, time, satellite almanachand internal drift estimates in non-volatile memory so as toincrease accuracy and reduce locking time atthe next power up.

After recording is finished, all indicators except MAINS on the front panel will be turned off.

22

6 Configuration

6.1 Overview

Configuration is performed using the Ethernet port. Factorydefaults for this port are:



Password cond3e89

6.2 Protocols

The ASCII commands described in this chapter can be used overthe SSH protocol (Secure SHell protocol)(port 22) or over the TELNET protocol (port 23).

If there is a choice, the SSH protocol should be used since it is much more secure than the TELNETprotocol.

The TELNET protocol can be disabled with theTELNET OFF ASCII command (refer to page 46 forfurther details).

6.3 Running TELNET from Windows

Windows 95, 98, ME, NT, 2000, or XP

To access Microsoft Telnet from Windows 95, Windows 98, Windows ME, Windows NT, Windows 2000,or Windows XP, click START,RUN, then type

telnet ip

where “ip” is the ip address of the RT420 you want to access. Then press ENTER.

Some setups of Microsoft Windows may prohibit users from running the telnet command. Check with yoursystem administrator if you are unable to open the program.

Windows Vista

By default, Telnet is not installed with Windows Vista. It can be installed by following the steps below.

23

6. CONFIGURATION

1. Click theStart button, clickControl panel, click Programs, and then clickTurn Windows featureson or off. If you are prompted for an administrator password or confirmation, type the password orprovide confirmation.

2. In theWindows Featuresdialog box, select theTelnet Client check box.

3. Click OK . The installation might take several minutes.

6.4 Running SSH

SSH clients are built-in in Linux, Unix and MacOS.

PUTTY is a free, open source SSH client for Windows, Linux, and Unix. TERATERM is another free SSHclient for Windows.

Please contact REASON for help in selecting and installing a SSH client for Windows.

6.5 Authentication

The equipment configuration is protected by ausername and apassword. The factory default settings are:

username configurationpassword cond3e89

The password can (and should) be changed withPASSWDASCII command (refer to page 41 for furtherdetails).

The default password can be restored by pressing and holdingthe RST button for at least 2 seconds. TheRST button is located on the unit’s back panel, near the Ethernet port. To reach the button, use a smallscrewdriver, a paper clip straightened out or similar object with a diameter less than 1 mm (0.04 in).

Please note that, apart from restoring the default password, the RST button will also reset the networkconfiguration (IP address, network mask, broadcast and gateway addresses) and also re-enable the TELNETprotocol.

After passing authentication, the user will be greeted witha message stating the date and time of the lastconfiguration session and the IP address of the computer fromwhere it was started.

Last login: Fri Feb 8 10:13:11 2008 from 192.168.0.23

Type ’HELP’ for help.>

6.6 Behavior during configuration

The following events will occur during the configuration:

• TTL-level, open collector and optical outputs stop sendingdata at the next second roll-over

• the RS232 serial port will stop sending datagrams after the current one has been sent

• the internal NTP server will stop responding to connection attempts

• front panel time display will show ’–:–:–’

• the LOCKED relay will open, the LOCKED indicator on the front panel goes out

24

Configuration Sequence

• the READY indicator on the front panel stays lit

The following actions will take place after ending the configuration session with theEXIT command(page 36)

• TTL-level, open collector and optical outputs start sending data at the next second roll-over

• the RS232 serial port starts sending datagrams

• the internal NTP server accepts connections

• front panel time display shows actual local time

• the LOCKED relay will close and the LOCKED indicator on the front panel will lit as soon as therequired conditions are met

6.7 Configuration Sequence

This section describes the steps required to configure a RT420. It is suggested that the configuration beperformed in the sequence described below.

The configuration uses the ASCII commands described in Chapter 7.

1. Communication

a) Use theETHER command (page 35) to set the required IP address, network mask, broadcastand gateway addresses.

b) Decide if the TELNET protocol is required. If it is not required, it should be disabled for safetyreasons with theTELNET OFF command (page 46).

c) Change the factory-default password with thePASSWDcommand (page 41).

2. Time Zone and Daylight Saving Time

a) Use theTZ command (page 49) to set the timezone.

b) Decide if Daylight Saving Time rules should be enabled anduse theDST command (page 34)to configure them. DST rules are disabled by default.

3. Time Reference

a) The unis is set by default to use GPS satellites as a time reference. In this case no action fromthe user is required since this is the default. If the unit is being operated as a time repeater usetheTIME-REFERENCE IRIGB command (page 47) to select the IRIG-B000 optical input.

b) The best possible accuracy is obtained when using theDELAY command (page 32) to specifythe cable delay (antenna cable or optical fiber) to be internally compensated. Typical propaga-tion delay times for antenna cables and optical fibers are listed on pages 14 and 15 respectively.

4. TTL-level outputs

a) Decide which signal is desired at each of the TTL-level outputs and use theOUTPUT command(page 40) to select it.

b) If a pulse-on-time or a pulse-on-date is desired, use theTMARK andDMARK commands(respectively described on pages 48 and 33) to configure the unit accordingly.

c) If a low-frequency pulse is desired, use thePPX command (page 43) to select the requiredfrequency.

d) Use thePOLARITY command (page 42) if needed.

e) Adjust the pulse width with theWIDTH command (page 51) if needed.

25

6. CONFIGURATION

5. Open-collector outputs

a) Decide which signal is desired at each of the open-collector outputs and use theOUTPUTcommand (page 40) to select it.

b) If a pulse-on-time or a pulse-on-date is desired, use theTMARK andDMARK commands(respectively described on pages 48 and 33) to configure the unit accordingly.

c) If a low-frequency pulse is desired, use thePPX command (page 43) to select the requiredfrequency.

d) Use thePOLARITY command (page 42) if needed.

e) Adjust the pulse width with theWIDTH command (page 51) if needed.

6. RS232 serial port

a) Select one of the built-in datagrams with theDATAGRAM command (page 30). If none ofthe built-in datagrams is adequate for the application, usetheASCII-DATAGRAM command(page 29) to define a datagram and then issue theDATAGRAM ASCII command.

b) Use theSERIAL command (page 44 to configure bitrate, number of data bits, parity and num-ber of stop-bits.

c) Use theHOLD command (page 37) to configure at which precise time after (orbefore) thesecond rollover the message will be sent.

d) If the PPS pin on the serial port is used, its polarity and pulse width can be configured with thePOLARITY andWIDTH commands (respectively pages 42 and 51).

26

7 ASCII Commands

7.1 Command Format

ASCII commands must be all uppercase or all lowercase. Mixedupper and lowercase commands are notrecognized.

If an ASCII command is entered without any parameters, a short usage message will be returned followedby the current configuration for that command. When using parameters, all of them must be entered in thespecified sequence.

If an invalid or out-of-range parameter is entered, a “Invalid parameter:” followed by the offending text willbe issued.

Similarly, if an unknown command is entered, a “command not found” message will be issued.

7.2 Command History and Editing

Durign a configuration session, the last commands issued by the user can be retrieved with the “up” and“down” keys.

Once retrieved, a command can be edited by moving the cursor with the “left” and “right” keys and insertingand deleting new characters as appropriate.

27

7. ASCII COMMANDS

7.3 Command Reference

ASCII-DATAGRAM ASCII datagram definitionDATAGRAM selection of datagram to be sent over serial port

DATE adjusts date and time of internal CMOS clockDELAY cable delay compensation

DMARK configures date and time for pulse-on-dateDST Daylight-Saving-Time rules configuration

ETHER network parameters configurationEXIT closes configuration sessionHELP lists all available commands with a short descriptionHOLD configures hold-time for serial port messages

NTP-OFFSET adjusts the time reported by the NTP serverOUTPUT configures signal present at TTL-level and open collector outputsPASSWD password change

POLARITY configuration of TTL-level and open collector outputs polarityPPX low frequency generator configuration

SERIAL RS232 serial port parametersSHOW shows current configuration

TELNET enables / disables TELNET protocolTMARK configures time for pulse-on-time

TIME-REFERENCE selects GPS or IRIGB time referenceTZ timezone configuration

VERSION reports firmware versionWIDTH configuration of TTL-level and open collector outputs pulsewidth

28

Command Reference

ASCII-DATAGRAM

Description

Allows the definition of the “ASCII” datagram which will be sent out of the RS232 serial portonce per second.

Syntax

ASCII-DATAGRAM “string”

Where “string” is the definition of the datagram comprising literal characters and escape-sequences for time and date-related parameters.

Below is a list of the escape-sequences and the values returned.

Escape-sequence Values Description

%H 00 . . . 23 hours%M 00 . . . 59 minutes%S 00 . . . 59 seconds%j 001 . . . 366 day-of-year%d 01 . . . 31 day-of-month%m 01 . . . 12 month%y 00 . . . 99 year (two last digits)%Y 2000 . . . 2099 year (four digits)%u 1 . . . 7 day-of-week (1 = Monday)%w 0 . . . 6 day-of-week (0 = Sunday)%s ‘S’ or ‘ ’ DST (‘S’ if Daylight-Saving-Time, ‘ ’ otherwise)%o ‘ ’ or ‘#’ status (‘ ’ if locked, ‘#’ otherwise)%O ‘ ’ or ‘*’ status (‘ ’ if locked, ‘*’ otherwise)%Q ‘ ’ or ‘?’ status (‘ ’ if locked, ‘?’ otherwise)%1 <SOH> start-of-header (ASCII 01)%2 <STX> start-of-text (ASCII 02)%3 <ETX> end-of-text (ASCII 03)%4 <LF> line feed (ASCII 10)%5 <CR> carriage return (ASCII 13)%x checksum type 1%% ‘%’ ‘%’ character (ASCII 37)

‘ ’ is the “blank space” character (ASCII 32).

Checksum type 1 consists two hexadecimal characters representing the XOR operation of allcharacters between a ‘$’ and ‘*’ (the ‘$’ and the ‘*’ are not included in the checksum). Usefulfor NMEA-type datagrams.

Example

ASCII-DATAGRAM “Day:%d;Mes:%m;Year:%Y;Hour:%H;Minute:%M;Second:%S;;%3”

29

7. ASCII COMMANDS

DATAGRAM

Description

Selects which datagram will be sent out of the RS232 serial port. The choices are any ofthe built-in datagrams (refer to Chapter 8) or the custom defined ASCII-datagram (refer tocommandASCII-DATAGRAM ).

Syntax

DATAGRAM type

type ASCII selects datagram defined byASCII-DATAGRAMACEB selects built-in ACEB datagramGPZDA selects built-in GPZDA datagramMEINBERG selects built-in Meinberg datagram

Example

DATAGRAM ASCIIDATAGRAM GPZDA

30

Command Reference

DATE

Description

This ASCII command sets date and time on the internal CMOS clock.

This command only has to be issued if the date and time information in the CMOS clock hasbeen corrupted by, for example, a weak battery.

Date and time should be informed in local time, as specified bytheTZ andDST commands.

Syntax

DATE yyyy-mmm-dd hh:mm:ss

yyyy 2000 . . . 2099 yearmmm Jan . . . Dec month

dd 01 . . . 31 dayhh 00 . . . 23 hour

mm 00 . . . 59 minutess 00 . . . 59 second

Example

DATE 2008-Feb-19 14:53:15

31

7. ASCII COMMANDS

DELAY

Description

Selects cable delay compensation. The command can be used tocompensate GPS antennacable propagation delays and IRIG-B000 optical fiber propagation delays.

Syntax

DELAY nanoseconds

nanoseconds 0 to 10000 ns (50 ns steps)

Example

DELAY 1400DELAY 200

32

Command Reference

DMARK

Description

Sets date and time for pulse-on-date.

Syntax

DMARK yyyy-mmm-dd hh:mm:ss

yyyy 2000 . . . 2099 yearmmm Jan . . . Dec month

dd 01 . . . 31 dayhh 00 . . . 23 hour

mm 00 . . . 59 minutess 00 . . . 59 second

Example

DMARK 2008-Mar-01 12:53:45

33

7. ASCII COMMANDS

DST

Description

Configures Daylight-Saving-Time rules. Can also be used to turn DST rules off.

Syntax

DST BEGIN hh:mm wday monthEND hh:mm wday month

hh:mm 00:00 . . . 23:59 time of DST start / endwday firstSun first Sunday

secondSat second SaturdaylastFri last Friday

month Jan . . . Dec month

DST OFF

Example

DST OFFDST BEGIN 00:00 lastSat Oct END 01:00 thirdSat Feb

34

Command Reference

ETHER

Description

Configures network parameters

Syntax

ETHER ip mask broadcast gateway

ip IP addressmask network mask

broadcast broadcast addressgateway gateway address

Example

ETHER 192.168.20.170 255.255.255.0 192.168.20.255 192.168.20.1

35

7. ASCII COMMANDS

EXIT

Description

Closes configuration session. New configuration is applied and the units resumes generatingtime, frequency and phase signals.

Syntax

EXIT

Example

EXIT

36

Command Reference

HOLD

Description

Configures hold time for the serial datagram. Time is relative to the second-rollover and canbe positive (message is sent later than the second rollover)or negative (message is sent earlierthan the second rollover).

Syntax

HOLD ms

ms -999 . . . 999 hold time in milliseconds

Example

HOLD 200HOLD -120

37

7. ASCII COMMANDS

HELP

Description

Prints list of all available ASCII commands.

Syntax

HELP

Example

HELP

38

Command Reference

NTP-OFFSET

Description

Allows correction of values reported by the NTP server.

Normally not needed, but can be used to compensate for systemic time differences.

Syntax

NTP-OFFSET milliseconds

Example

NTP-OFFSET 5

39

7. ASCII COMMANDS

OUTPUT

Description

Selects the signal to be output at the TTL-level and open collector outputs.

Factory default is a IRIG-B000 signal for the TTL-level outputs and no signal at the opencollector outputs.

Syntax

OUTPUT output signal

output TTL1 . . . TTL8 TTL-level outputsOC1 . . . OC3 open collector outputs

signal OFF no signalIRIGB IRIG-B000 signal100PPS 100 Hz square-wave1PPS 1 pulse-per-second1PPM 1 pulse-per-minutePPX low frequency pulse generator (refer toPPX ASCII command)

TMARK pulse-on-time, repeated daily (refer toTMARK ASCII com-mand)

DMARK pulse-on-date, never repeated (refer toDMARK ASCII com-mand)

Example

OUTPUT TTL1 1PPSOUTPUT TTL2 1PPMOUTPUT TTL3 PPXOUTPUT OC1 TMARK

40

Command Reference

PASSWD

Description

Changes the access password. The new password has to be informed twice and is not shownduring input.

Syntax

PASSWD

Example

PASSWD 3478bc

41

7. ASCII COMMANDS

POLARITY

Description

Selects the polarity of signals at TTL-level, open-collector outputs and at the PPS-pin of theRS232 serial port.

Factory default in normal (ie not-inverted) polarity at alloutputs.

Syntax

POLARITY output polarity

output TTL1 . . . TTL8 TTL-level outputsOC1 . . . OC3 open-collector outputs

SERIAL PPS pin at RS232 serial portpolarity + normal polarity

- inverted polarity

Example

POLARITY TTL1 -POLARITY SERIAL -POLARITY OC2 +

42

Command Reference

PPX

Description

Configuration of low frequency pulse generator. Values accepted range from one pulse every-two-seconds to one pulse every-twenty-four-hours.

Syntax

PPX interval

interval 2s, 3s, 4s, 5s, 6s, 10s, 12s, 15s, 60s2m, 3m, 4m, 5m, 6m, 10m, 12m, 15m, 60m2h, 3h, 4h, 6h, 8h, 12h, 24h

Example

PPX 5sPPX 60m

43

7. ASCII COMMANDS

SERIAL

Description

Configuration of bitrate and format (number of data bits, parity, number of stop bits) for datasent out of the RS232 serial port.

Syntax

SERIAL speed data parity stop

speed 1200 . . . 38400data 7 or 8 data bits

parity none (N), even (E) or odd (O)stop 1 or 2 stop bits

Example

SERIAL 19200 8 N 1SERIAL 1200 7 E 2

44

Command Reference

SHOW

Description

Prints unit current configuration.

Syntax

SHOW

Example

SHOW

45

7. ASCII COMMANDS

TELNET

Description

Enables / disables the TELNET protocol.

Factory default is enabled.

Syntax

TELNET status

status ON enables TELNET protocolOFF disables TELNET protocol

Example

TELNET OFFTELNET ON

46

Command Reference

TIME-REFERENCE

Description

Selects time reference (GPS satellites or external IRIG-B000).

Syntax

TIME-REFERENCE source

source GPS GPS satellitesIRIGB IRIG-B000 optical input

Example

TIME-REFERENCE GPSTIME-REFERENCE IRIGB

47

7. ASCII COMMANDS

TMARK

Description

Sets time for pulse-on-time. Pulse is repeated daily at the same time.

Syntax

TMARK hh:mm:ss

hh 00 . . . 23 hourmm 00 . . . 59 minute

ss 00 . . . 59 second

Example

TMARK 18:53:46

48

Command Reference

TZ

Description

Configures the timezone to be used when converting UTC time tolocal time. Note that half-hour time zones are supported.

Syntax

TZ hh:mm

hh -12 . . . 12 hoursmm 00 or 30 minutes

Example

TZ -03:00TZ -04:30TZ 01:00

49

7. ASCII COMMANDS

VERSION

Description

Prints version of installed firmware.

Might be required when contacting product support.

Syntax

VERSION

Example

VERSION

50

Command Reference

WIDTH

Description

Adjusts the pulse width for the 1PPS, 1PPM, PPX, TMARK and DMARK signals on the TTL-level, open-collector outputs and the PPS pin on the RS232 serial port

Factory default is 200 ms.

Syntax

WIDTH ms

ms 10 . . . 990 ms 10 ms steps

Example

WIDTH 250WIDTH 500

51

8 Datagrams

This chapter describes the built-in datagrams in alphabetical order.

If the datagram needed is not described on the following pages, use theASCII-DATAGRAM to define yourown datagram or contact REASON for further support.

Please note that the datagrams definition comprises only themessage itself and the frequency at which it issent.

The bitrate and format of the characters can be configured using theSERIAL ASCII command (refer topage 44 for further information).

The position of the on-time-mark characters can be configured using theHOLD ASCII command (refer topage 37 for further information).

53

8. DATAGRAMS

8.1 ACEB

Comprises 13 bytes, sent once per minute at second 02.

Byte Description Possible Values

1 Delimiter 0xFF2 Header 0x013 Status 0x00 (locked) or 0x01 (not locked)4 Start of transmission 0x025 Day of week BCD 01 (Monday) . . . BCD 07 (Sunday)6 Year BCD 00 . . . 997 Month BCD 01 . . . 128 Day of month BCD 01 . . . 319 Hour BCD 00 . . . 23

10 Minute BCD 00 . . . 5911 Second BCD 0212 End of transmission 0x0313 Synchro byte 0x16

54

GPZDA

8.2 GPZDA

Comprises 32 characters, sent once per second.

$GPZDA,hhmmss.0,DD,MM,YYYY,,*CC<CR><LF>

where

Parameter Possible Values Description Remarks

hh 00 . . . 23 hoursmm 00 . . . 59 minutesss 00 . . . 59 seconds

ddd 001 . . . 366 day-of-yearDD 01 . . . 31 day-of-monthMM 01 . . . 12 month

YYYY 2000 . . . 2099 year (4 digits)

Character ASCII ASCII Description(decimal) (hexadecimal)

<LF> 10 0A line feed<CR> 13 0D carriage return

Parameter Description Possible Values

CC checksum two hexadecimal digits representing the result of theexclusive OR of all character between ‘$’ e ‘*’(‘$’ and ‘*’ not included in the computation)

55

8. DATAGRAMS

8.3 MEINBERG

Comprises 32 characters, sent once per second.

<STX>D:DD.MM.YY;T: w;U:hh.mm.ss;uv <ETX>

where

Parameter Possible Values Description Remarks

hh 00 . . . 23 hoursmm 00 . . . 59 minutesss 00 . . . 59 seconds

DD 01 . . . 31 day-of-monthMM 01 . . . 12 monthYY 00 . . . 99 year (2 digits)w 1 . . . 7 day-of-week 1 means Monday

Character ASCII ASCII Description(decimal) (hexadecimal)

<STX> 02 02 start-of-datagram<ETX> 03 03 end-of-datagram

32 20 blank space

Parameter Description Possible Values

u status ‘ ’ if locked, ‘#’otherwisev status ‘ ’ if locked, ‘*’ otherwise

56

9 Maintenance and Troubleshooting

9.1 Common Problems

ALARM indicator lit

Possible causes Solution

CMOS clock backup battery is empty Replace CMOS clock battery

ANTENNA OPEN indicator lit


No antenna connected Connect antennaAntenna cable defect Replace antenna cable

ANTENNA SHORT indicator lit


Deffective antenna cable Replace antenna cableWrong antenna connected Use only active GPS antenna (3.3 Vdc,

100 mA max)

Time Display shows ‘–:–:–’


Configuration session in progress Close the configuration session with theEXIT command

57

9. MAINTENANCE AND TROUBLESHOOTING

Time step Normal behavior, no action required if itoccurs briefly when locking to GPS orIRIG-B000 time reference

L OCKED indicator off


Configuration session in progress Close the configuration session with theEXIT command

No reachable satellites (if using GPS input) Check antenna location, refer to section 4.4for details

No IRIG-B000 signal at the optical input(if using IRIG-B000 input)

Check cable and signal type, refer to sec-tion 4.6 for details

L OCKED indicator blinking


Almanach being downloaded from satellite Normal behavior,no action required. TheLOCKED indicator will stop blinking afterthe download is complete (approximately12 minutes). Occurs only if the unit hasbeen moved over great distance since lastpowered off or has been off for severalweeks.

9.2 Forgotten Password or Unknown Network Parameters

Press and hold the ‘RST’ button on the back of the unit for at least 2 seconds with a paper clip. The unitwill revert to the following factory default values.



Password cond3e89TELNET protocol enabled

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CMOS Clock Battery Replacement

9.3 CMOS Clock Battery Replacement

1. Switch the unit off and disconnect it from the power source.2. Open the unit by removing the six Philips-headed screws that hold the top cover in place. Two of the

screws are located at the unit’s top, two on the right side andthe remaining two on the left side.3. Replace the battery with a 3 V Lithium battery, model CR2032 or equivalent. The battery can only

be inserted in one way (with the postive pole towards the unit’s back panel).4. Re-assemble the unit’s top cover using the previously removed screws.5. Re-connet power to the unit and switch it on.6. The unit will stop after initialization, showing ‘–:–:–’on the time display. The ALARM indicator on

the front panel will be on.7. Use theDATE command to set the date and time.

9.4 Returning a Unit

To request equipment repair service, call REASON or representative to check out shipment options andreceive atechnical assistance reference code.

The equipment shall be packed in its original package or a suitable package to protect against impacts andmoisture.

Send equipment to address supplied including the sender’s identification and thetechnical assistance refer-ence code on the outside of the package.

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Part Numbers

P025-A 2 2 / 2

IRIG-B000 inputNo IRIG-B000 input 0

IRIG-B000 optical input 1Number of optical outputs

∗0 to 8 *Hardware revision code

∗1 to 9 *

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Modbus Interface

Implementation

The Modbus implementation follows the “OPEN MODBUS/TCP Specification” from Schneider Electric(29th March 1999).

Connections are accepted at TCP port 502. All data is ‘big-endian’ (most significant byte first).

Message Format

Bytes Contents Remarks

0-1 transaction identifier from request, normaly 02-3 protocol identifier always04-5 number of remaining bytes in message from byte 7 onwards6 unit identifier unit only responds to identifier 1

Implemented Functions

The unit only supports Modbus function 4 (read input registers).

All other functions will return the following


7 8Xh number of requested funtion with most significant bit set to ‘1’8 exception code 1 unimplemented function

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MODBUS INTERFACE

Function 4 (Read Input Registers)

Only one register can be read at a time.

Request


7 04h function code8-9 address of the register to be read

10-11 number of consecutive registers to read always 1

Response


7 04h function code8 number of bytes in response always 2 (single register)

9-10 contents of register

Exception


7 84h8 exception code 2 address not valid or number of registers different from one

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Registers Map

Registers Map

Status

Register Address Type Min Max Interpretation

Locked 010 RO 0 1 1 if LockedAlarm 011 RO 0 1 if AlarmAntenna Open 012 RO 0 1 1 if Antenna cable openAntenna Short 013 RO 0 1 1 if Antenna cable short-circuitedSatellite Count 014 RO 0 12 number of satellites used

Local Time

Register Address Type Min Max

Year 020 RO 1969 2070Month 021 RO 1 12Day Of Month 022 RO 1 31Hours 023 RO 0 23Minutes 024 RO 0 59Seconds 025 RO 0 59

UTC Time

Register Address Type Min Max

Year 030 RO 1969 2070Month 031 RO 1 12Day Of Month 032 RO 1 31Hours 033 RO 0 23Minutes 034 RO 0 59Seconds 035 RO 0 59

Time Zone & Time Offset

Register Address Type Min Max Scale Factor

Time Offset 040 RO -24 24 0.5Time Zone 041 RO -24 24 0.5

Daylight Saving Time

Register Address Type Min Max Interpretation

DST 042 RO 0 1 1 if DST0 if Standard Time

DST Pending 043 RO 0 1 1 during the minute that preceedsDST activation / deactivation

65

MODBUS INTERFACE

Position

Register Address Type Min Max Scale Factor Units

Latitude South 050 RO 0 1 0 if Northern Hemisphere1 if Southern Hemisphere

Latitude Degrees 051 RO 0 90 degreesLatitude Minutes 052 RO 0 59 minutes of arcLatitude Seconds 053 RO 0 5900 0.01 seconds of arcLongitude West 054 RO 0 1 0 if Eastern Hemisphere

1 if Westhern HemisphereLongitude Degrees 055 RO 0 180 degreesLongitude Minutes 056 RO 0 59 minutes of arcLongitude Seconds 057 RO 0 5900 0.01 seconds of arcAltitude 058 RO 0 65535 meters

GPS Channels

Register Address Type Min Max Scale Factor Units / Interpretation

Channel 1 Status 060 RO 0 2 0: channel not in use1: locked to satellite2: searching for satellite

Channel 1 Sat Number 061 RO 0 32 0: channel not in use1 to 32: satellite number

Channel 1 Signal Level 062 RO 0 65535 0.01 dB-HzChannel 1 Sat Elevation 063 RO 0 900 0.1 degreesChannel 1 Sat Azimuth 064 RO 0 3600 0.1 degrees










Channel 5 Status 100 RO 0 2 0: channel not in use1: locked to satellite

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Registers Map

2: searching for satelliteChannel 5 Sat Number 101 RO 0 32 0: channel not in use

1 to 32: satellite numberChannel 5 Signal Level 102 RO 0 65535 0.01 dB-HzChannel 5 Sat Elevation 103 RO 0 900 0.1 degreesChannel 5 Sat Azimuth 104 RO 0 3600 0.1 degrees


















Channel 11 Signal Level 162 RO 0 65535 0.01 dB-Hz

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MODBUS INTERFACE

Channel 11 Sat Elevation 163 RO 0 900 0.1 degreesChannel 11 Sat Azimuth 164 RO 0 3600 0.1 degrees




Obs. Repetir o conjunto de registradores Channel01 para Channel02 a Channel12 onde os endereos iniciaisdevem ser, respectivamente, 070 e 170.

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Summary of IRIG-B Standard

IRIG-B000 and IRIG-B120 Contents

Bit Time Contents Description

0 Pr reference bit (Pr)

1 Pr + 10 ms seconds 1 seconds (0 . . . 59 or 60)2 Pr + 20 ms seconds 23 Pr + 30 ms seconds 44 Pr + 40 ms seconds 85 Pr + 50 ms index bit (0)6 Pr + 60 ms seconds 107 Pr + 70 ms seconds 208 Pr + 80 ms seconds 40

9 Pr + 90 ms position identifier 1 (P1)

10 Pr + 100 ms minutes 1 minutes (0 . . . 59)11 Pr + 110 ms minutes 212 Pr + 120 ms minutes 413 Pr + 130 ms minutes 814 Pr + 140 ms index bit (0)15 Pr + 150 ms minutes 1016 Pr + 160 ms minutes 2017 Pr + 170 ms minutes 40

18 Pr + 180 ms index bit (0)19 Pr + 190 ms position identifier 2 (P2)

20 Pr + 200 ms hours 1 hours (0 . . . 23)21 Pr + 210 ms hours 222 Pr + 220 ms hours 423 Pr + 230 ms hours 824 Pr + 240 ms index bit (0)25 Pr + 250 ms hours 1026 Pr + 260 ms hours 20

27 Pr + 270 ms index bit (0)28 Pr + 280 ms index bit (0)29 Pr + 290 ms position identifier 3 (P3)

30 Pr + 300 ms days 1 day-of-year (1 . . . 365 or 366)31 Pr + 310 ms days 232 Pr + 320 ms days 433 Pr + 330 ms days 834 Pr + 340 ms index bit (0)35 Pr + 350 ms days 1036 Pr + 360 ms days 20

69

SUMMARY OF IRIG-B STANDARD

37 Pr + 370 ms days 4038 Pr + 380 ms days 8039 Pr + 390 ms position identifier 4 (P4)40 Pr + 400 ms days 10041 Pr + 410 ms days 200

42 Pr + 420 ms index bit (0)43 Pr + 430 ms index bit (0)44 Pr + 440 ms index bit (0)45 Pr + 450 ms index bit (0)46 Pr + 460 ms index bit (0)47 Pr + 470 ms index bit (0)48 Pr + 480 ms index bit (0)49 Pr + 490 ms position identifier 5 (P5)

50 Pr + 500 ms year 1 last two digits of year (00 . . . 99)51 Pr + 510 ms year 252 Pr + 520 ms year 453 Pr + 530 ms year 854 Pr + 540 ms index bit (0)55 Pr + 550 ms year 1056 Pr + 560 ms year 2057 Pr + 570 ms year 4058 Pr + 580 ms year 80

59 Pr + 590 ms position identifier 6 (P6)60 Pr + 600 ms index bit (0)61 Pr + 610 ms index bit (0)

62 Pr + 620 ms Daylight Saving Pending (DSP) 1 during the minute that precedesstart or end of DST

63 Pr + 630 ms Daylight Saving Time (DST) 1 during DST

64 Pr + 640 ms Time Offset Sign (0=+, 1=-) sign of difference between local time and UTC(minus to the west of Greenwich)

65 Pr + 650 ms Time Offset 1 difference between local time and UTC66 Pr + 660 ms Time Offset 2 (-12 . . . +12)67 Pr + 670 ms Time Offset 468 Pr + 680 ms Time Offset 869 Pr + 690 ms position identifier 7 (P7)70 Pr + 700 ms Time Offset /2

71 Pr + 710 ms Time Quality 0000 (0) : locked72 Pr + 720 ms Time Quality 1111 (F) : no-time73 Pr + 730 ms Time Quality 1011 (B) : never locked74 Pr + 740 ms Time Quality 0100 (4) : free-wheeling

75 Pr + 750 ms Parity (odd) modulo 2 sum of all preceding data bitsBits 75-99 are not included in the sum

76 Pr + 760 ms index bit (0)77 Pr + 770 ms index bit (0)78 Pr + 780 ms index bit (0)79 Pr + 790 ms position identifier 8 (P8)

80 Pr + 800 ms time-of-day 1 straight binary seconds81 Pr + 810 ms time-of-day 2 (0 . . . 86399 or 86400)82 Pr + 820 ms time-of-day 483 Pr + 830 ms time-of-day 8

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IRIG-B000 and IRIG-B120 Contents

84 Pr + 840 ms time-of-day 1685 Pr + 850 ms time-of-day 3286 Pr + 860 ms time-of-day 6487 Pr + 870 ms time-of-day 12888 Pr + 880 ms time-of-day 25689 Pr + 890 ms position identifier 9 (P9)90 Pr + 900 ms time-of-day 51291 Pr + 910 ms time-of-day 102492 Pr + 920 ms time-of-day 204893 Pr + 930 ms time-of-day 409694 Pr + 940 ms time-of-day 819295 Pr + 950 ms time-of-day 1638496 Pr + 960 ms time-of-day 3276897 Pr + 970 ms time-of-day 65536

98 Pr + 980 ms index bit (0)99 Pr + 990 ms position identifier 0 (P0)

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