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Thinkify Application Note

Using the TR-65 RFID Module's Asynchronous Serial Ports withExternal 5V Power

Overview

The Thinkify TR-65 RFID Reader module is a flexible, low-cost Gen2 RFID Reader-Writer. It supports three different communication interfaces; USB configured as a CDC device (communication device class), asynchronous serial at RS232 voltage levels and asynchronous serial at TTL voltage levels (on one of two available ports). When using the asynchronous serial interface in either RS232 or TTL mode, the TR-65 Requires an external 5V supply. (+5V +/- 10% 600mA), and the USB interface must be disconnected. When the USB communication is used, the device is powered from the host USB port. This application note describes how to configure the TR-65 RFID module for operation with external power to use either the RS232 or TTL Ports.

Copyright 2010 Thinkify LLC. All Rights Reserved. Thinkify, LLC, 18450 Technology Drive, Suite E, Morgan Hill, Ca. 95037, www.thinkifyit.com 408-782-7111

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Illustration 1: The Thinkify TR65 RFID Module

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Configuring the Reader for USB or TTL Operation


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Illustration 2: Required Jumper Positions for USB Operation


Both ports have the same pin configuration, shown in the figures below with the board edge-on.

Pins are defined in the tables below.

Data is sent / received w/RS232 or TTL signaling levels depending upon whether Pin 7 is grounded. Grounding Pin 7 causes TTL signaling to be used on the active port. Ungrounding Pin 7 causes the active port to use RS232 signaling levels.

Note: If you are communicating with a PC, use RS232 Signaling levels.


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Illustration 3: Edge View Serial Port 1

Illustration 4: Edge View Serial Port 2


Configuration for RS232 Signaling Levels

Pin Description

PIN 1 +5V DC in. (Spec: +5V +/- 10% 600mA)

PIN 2 RS232 level data from PC coming into Reader

PIN 3 NC

PIN 4 RS232 level data from Reader going into PC

PIN 5 NC

PIN 6 RS232 GND

PIN 7 NC

PIN 8 5V Return (ground from power supply)

Configuration for TTL Signaling Levels

Pin Description

PIN 1 +5V DC in. (Spec: +5V +/- 10% 600mA)

PIN 2 NC

PIN 3 TTL level data from Embedded System coming into Reader

PIN 4 NC

PIN 5 TTL level data from Reader going into Embedded System

PIN 6 NC

PIN 7 TTL GND (Connect to PIN 8)

PIN 8 5V Return (ground from power supply)


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Serial Communication Parameters (Hyperterminal Screenshot)

Important Notes:

1: USB must NOT be hooked up when running over the RS232 interface.

2: Bootloader functionality only works over the USB interface.

3: Mating connectors for the Asynchronous Serial Ports and the GPIO port are available from Thinkify.


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Illustration 5: Serial Port Communication Parameters


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