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NATIONAL RADIO ASTRONOMY OBSERVATORYGREEN BANK, WEST VIRGINIA
ELECTRONICS DIVISION TECHNICAL NOTE NO 160
Title: WEATHER MONITOR SYSTEM
Author(s): Dwayne R. Schiebel
Date: June 7, 1990
DISTRIBUTION:
GB CV TU VLAGB Library ER Library Library Downtown VIA LibraryR. Lacasse IR Library Library Mountain P. NapierD. Schiebel M. Balister R. Freund J. CampbellE. Childers N. Bailey P. Jewell R. WeimerC. Brockway L. D'Addario J. LambJ. Coe N. HornerR. Norrod A. R. KerrS. White C. BurgessG. Behrens S. SrikanthR. FisherF. CrewsL. HowellF. Ghigo
WEATHER MONITOR SYSTEM
Dwayne R. Schiebel
Introduction
This note describes a WEATHER MONITOR SYSTEM that was built to enable aPC to input weather information through its serial port. This system was builtaround the VLBA MONITOR & CONTROL CARD. In addition to weather information, 16bits of digital input and output were provided. In order to provide isolationbetween the weather monitor chassis and the PC the data link is over fiber-optic cable. This fiber-optic cable is connected to a multiplexer built by R.Weimer.
Programming
The selected ID for VLBA M & C card is 8. All addresses are baseaddress plus indicated address.
ADDRESS0 Dew Point1 Temperature2 Barometric Pressure3 Wind Speed4 Spare Analog Ch 45 Spare Analog Ch 56 Spare Analog Ch 67 Spare Analog Ch 7
64 Digital Output, 16 BitsDO Alarm, output a 1 to close a contactD1-D3 Spare output contact closuresD4-D7 Complemented TTL output bitsD8-D15 True TTL output bits
68 Digital Input, 16 BitsDO-D3 Optical isolated input bitsD4-D15 TTL true input bits
Electronics Descriptions
M & C Card Interface
The VLBA MONITOR & CONTROL CARD and its associated interface logic iscontained in one chassis; the block diagram (B17215K001) for this system canbe found at the end of this note. It contains three modules: An RS422 toFiber-Optic Converter, Interface for VLBA M & C card and the VLBA M & C card.
The RS422 to Fiber Converter can be found on drawing B17215S002. Thiscircuit was a copy of R. Weimer's circuit used in the Receiver Monitor Controlsystem. This converter circuit card can be removed through the back panel ofthe Weather Monitor Chassis. For test purposes a card has been designed to
allow the connection of the Weather Monitor directly to the PC without goingthrough fiber cable, reference drawing B17215S006.
Logic to interface the outside world to the VLBA M & C card can be foundon logic drawings B17215L001. Page 1 of the drawings contain the logic togenerate the necessary VLBA M & C handshake signals. The digital output logicis on page 2 and digital input logic is on page 3. Take note of the opticalisolated inputs DO-D3; the maximum input current is 50 mA.
A complete wiring diagram of the weather monitor chassis can be found ondrawing number B17215S003.
Analog Buffer Cards
Two analog buffer cards were built to condition the weather informationbefore it is supplied to the weather monitor chassis.
The first card, drawing B17215S004, was an addition to an existingbuffer card. This card was used to buffer dew point, temperature andbarometric pressure before it was sent to the 140-ft telescope. This card wasmodified by duplicating the three buffers and providing this weatherinformation to the weather monitor chassis.
The second buffer card is used for wind speed. It plugs into the windspeed chassis and provides gain and filtering for the weather monitor.
Credits
Credit should be given to R. Weimer for the fiber-optic circuit, toJ. Turner for constructing the necessary equipment for the weather monitor, theGreen Bank Shop for constructing the chassis, and to the designers of the VLBAM & C card.
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