05726 IAG Read-Only Radio Module Developer’s Guide TransCore, Inc.
©2010 TC License, Ltd. All rights reserved. TRANSCORE and ENCOMPASS are registered trademarks of TC License. All other trademarks listed are the property of their respective owners. Contents are subject to change. Printed in the U.S.A. For further information, contact: TransCore 3410 Midcourt Road, Suite 102 Carrollton, Texas 75006 USA Phone: (214) 461-4031 Fax: (214) 461-6478 Technical Support Web: transcore.
Contents Hardware Overview ........................................................................................................ 1 RF Connector .............................................................................................................. 1 Digital Connector ........................................................................................................... 2 Firmware Overview ........................................................................................................
Introduction to the 05726 IAG Read-Only Radio Module The 05726 embedded IAG read-only module is a radio frequency identification (RFID) radio that can be integrated into other systems to create RFID-enabled products that support the E-ZPass® Interagency Group (IAG) protocol. This document is written for developers and explains how to incorporate the 05726 TransCore Radio Module (hereafter called the 05726 radio module) into a third-party host system.
05726 IAG Read-Only Radio Module Developer’s Guide Digital Connector The digital connector provides power and serial communications signals. The connector is a 14-pin digital connector. Table 2 lists the pin-outs and descriptions. Table 2. Digital Connector Pin Assignments Pin No.
05726 IAG Read-Only Radio Module Developer’s Guide Functionality of the Embedded Module Regional Support This radio module has been designed to comply with the following regulatory requirements: North America Region FCC 47 CFG Chapter 1, Part 15 Industrie Canada RSS-210 Frequency The 05726 radio module has been designed to operate at a fixed frequency of 915.00 MHz.
05726 IAG Read-Only Radio Module Developer’s Guide Overview of the Communication Protocol The serial communication between a host and the reader is based on a synchronized command-response/master-slave mechanism. Whenever the host sends a message to the reader, it cannot send another message until after it receives a response. The reader never initiates a communication session, only the host initiates a communication session.
05726 IAG Read-Only Radio Module Developer’s Guide The communication packet fields are summarized in Table 3. Table 3. Host-to-Reader Communications Field Length Header (Hdr) 1 Data Length (Len) 1 byte 1 byte Command Data 1 byte N bytes (0 to 250) CRC-16 Checksum (CRC HI, CRC LO) 2 bytes Description Defines the start of the packet. Equal to 0xFF Defines the length, N, of the data field contained in the packet. Specifies the command that the reader is to execute.
05726 IAG Read-Only Radio Module Developer’s Guide Field Length Data M bytes (0 to 248) CRC-16 Checksum (CRC HI, CRC LO) 2 bytes Description Defines the binary data required by the reader for use with a command. This could, for example, represent data read from a transponder. Data length, M, can be a minimum of 0 bytes and a maximum of 248 bytes. CRC-16 checksum (high order byte first). CRC polynomial is CCITT CRC-16, with a preload of 0xFFFF. This does not fully specify the operation of the CRC.
05726 IAG Read-Only Radio Module Developer’s Guide Command Set The 05726 radio module uses only one command: • 0xFF – IAG read-only command. The Read command from the host causes the microcontroller to generate a Tx_enable signal, used by a 915-MHz oscillator and output RF switch, to generate a 20-microsecond trigger pulse. Instead of a timeout period specified in a command, the microcontroller generates up to 10 trigger pulses separated by 100 milliseconds.
05726 IAG Read-Only Radio Module Developer’s Guide Hardware Details This section details the physical components of the 05726 radio module including the pin 1 location for the serial connector. Antenna Connector The 05726 radio module has one MMCX connector for interfacing to an antenna. Communications Connector The communications interface on the module provides power, serial communications signals, and access to the general purpose inputs and outputs. The 05726 radio module has a 14-pin connector.
05726 IAG Read-Only Radio Module Developer’s Guide Connectors The connector used for the communications interface on the 05626 radio module is as follows: • JST SM14B-SRSS-TB The mating connectors are as follows: • Connector Shell: JST SHR-14V-S-B • Crimp Contacts: JST SSH-003T-PO.
05726 IAG Read-Only Radio Module Developer’s Guide 10
