TransCore 05726 LOW POWER TRANSCEIVER MODULE User Manual Encompass IAG PnP Reader System User s Manual

TransCore LOW POWER TRANSCEIVER MODULE Encompass IAG PnP Reader System User s Manual

Users Manual

05726 IAG Read-Only Radio Module Developer’s Guide TransCore, Inc. 8600 Jefferson Street NE Albuquerque, New Mexico 87113 December 2010 P/N 412114
©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.com/rfidsupport NO UNAUTHORIZED MODIFICATIONS CAUTION: TRANSCORE IS NOT RESPONSIBLE FOR ANY RADIO OR TV INTERFERENCE CAUSED BY UNAUTHORIZED MODIFICATIONS TO THIS EQUIPMENT. SUCH MODIFICATIONS COULD VOID THE USER’S AUTHORITY TO OPERATE THE EQUIPMENT.
Contents Hardware Overview ........................................................................................................ 1RF Connector .............................................................................................................. 1Digital Connector ........................................................................................................... 2Firmware Overview ........................................................................................................ 2Regional Support ........................................................................................................... 3Frequency ....................................................................................................................... 3Host-to-Reader Communication ................................................................................... 4Reader -to-Host Communication .................................................................................. 5CCITT CRC-16 Calculation ......................................................................................... 6Antenna Connector ........................................................................................................ 8Communications Connector ......................................................................................... 8Connectors ..................................................................................................................... 9 List of Figures Figure 1. Host-to-Reader Communication Packets .......................................................................... 4Figure 2. Host-to-Reader Communication Packets .......................................................................... 5Figure 3. 05726 Radio Module Communications Interfaces ............................................................ 8 List of Tables Table 1. Features of the 05726 Radio Module ................................................................................. 1Table 2. Digital Connector Pin Assignments .................................................................................... 2Table 3. Host-to-Reader Communication Descriptions .................................................................... 5Table 4. Reader-to-Host Communication Descriptions .................................................................... 5Table 5. Proposed Host-to-Reader Format of IAG Read (follows ThingMagic requirements) ......... 7Table 6. Proposed Reader-to-Host Format of IAG Read Response ................................................ 7 iii
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. Hardware Overview The 05726 radio module is a single board module designed for more space-constrained applications. The digital and analog electronics are located on the same circuit board. The 05726 radio module is designed to be incorporated into products requiring capabilities in a small form factor. Table 1 shows the basic features of the radio hardware. Table 1. Features of the 05726 Radio Module Specification Value Input Power Requirements +5V DC Communication Interfaces High-speed serial interface Protocols supported IAG read-only Dimensions (L x D x H) 3.1 x 2.5 x 0.3 in. (78 x 63 x 8 mm) RF Connector The 05726 radio module supports one MMCX connector for a single monostatic antenna. 1
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. Description 1 GND 2 GND 3 GND 4 +5V 5 +5V 6 NO CONNECTION 7 NO CONNECTION 8 NO CONNECTION 9 NO CONNECTION 10 NO CONNECTION 11 RS-232 RX TTL from host 12 RS-232 RX TTL to host 13 NO CONNECTION 14 NO CONNECTION Firmware Overview The software for the 05726 radio module is loaded at the factory and cannot be updated in the field. If the software requires updating, the radio module has to be returned to the factory. 2
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. 3
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. This protocol allows for each command to have its own timeout because some commands require more time to execute than others. The host manages retries if necessary, and the host tracks the state of the intended reader if it reissues a command. Host-to-Reader Communication Host-to-reader communication is packetized according to Figure 1. The reader can only accept one command at a time, and commands are executed serially, so the host waits for a reader-to-host response before issuing another host-to-reader command packet. Header Data Length Command Data CRC-16 Checksum Hdr Len Cmd - - - - - CRC HI CRC LO 1 byte 1 byte 1 byte 0 to N bytes 2 bytes Figure 1. Host-to-Reader Communication Packets 4
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 Description Header (Hdr) 1 byte Defines the start of the packet. Equal to 0xFF 1Data Length (Len) 1 byte Defines the length, N, of the data field contained in the packet. Command 1 byte Specifies the command that the reader is to execute. Data N bytes (0 to 250) Defines the binary data required by the reader for use with a command. This could, for example, represent the transponder data to be written. The length, N, can vary between 0 and 250 bytes. CRC-16 Checksum (CRC HI, CRC LO) 2 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. See the CCITT CRC-16 Calculation section for more details. Reader -to-Host Communication Figure 2 defines the format of the generic response packet that is sent from the reader to the host. The response packet is different in format from the request packet. Header Data Length Command Status Word Data CRC-16 Checksum Hdr Len Cmd Status Word - - - - - CRC HI CRC LO 1 byte 1 byte 1 byte 2 bytes 0 to M bytes 2 bytes Figure 2. Reader-to-Host Communication Packets The response packet fields are summarized in Table 4. Table 4. Reader-to-Host Communications Field Length Description Header (Hdr) 1 byte Defines the start of the packet. Equal to 0xFF 1Data Length (Len) 1 byte Defines the length, M, of the data field contained in the packet. Length can be 0 to 248 bytes. 2Command 1 byte Specifies the command that the reader is to execute. 3Status Word 2 bytes Specifies the status of the last command. Successful = 0x0000, else it contains a fault code. 1 Minimum packet length is 5 bytes and the maximum packet length is 255 bytes. 2 Each host command receives a response from the reader. In the response packet, the Header, Data Length, Command, Data, and Checksum are functionally similar to the command packet. 3 The only difference is the addition of the Status Word field. The Status Word has two types of values: a Status Word value of 0 (zero) means the command received was successful; any other value represents a fault. 5
05726 IAG Read-Only Radio Module Developer’s Guide Field Length Description Data M bytes (0 to 248) 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 (CRC HI, CRC LO) 2 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. See the CCITT CRC-16 Calculation section for more details. CCITT CRC-16 Calculation The same CRC calculation is performed on all serial communications between the host and the reader. The CRC is calculated on the Data Length, Command, Status Word, and Data bytes. The Header (SOH, 0xFF) is not included in the CRC. 6
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. The microcontroller stops when a tag is seen or when 10 pulses have been generated. Following the command formatted used by ThingMagic and TransCore’s Encompass® 1d host programs, the commands necessary for the 05726 radio module prototype are listed in the following tables. Table 5. Proposed Host-to-Reader Format of IAG Read (follows ThingMagic requirements) Header Data Length Command Data CRC-16 FFH 02H 21H XXXXH XXH Where Data Length Number of bytes in the Data field Data payload Set Data 0000H CRC CRC-16 Checksum. See Reader-to-Host Communications for details. Table 6. Reader-to-Host Format of IAG Read Response Header Data Length Command Status Word Data CRC-16 FFH 20H 21H 0X00H (256 bits) XXH Where Data Length Number of bytes in the Data field Status Word 0000H if tag CRC check succeeds 0400H if no tag found 0500H if tag CRC check fails Data Payload Current firmware returns all zeros (0) CRC CRC-16 Checksum. See Host-to-Reader Communications for details. 7
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. For the interface pin-out, see the 05726 Radio Digital Connectors section for more detail. Figure 3 shows the 05726 radio module communications interfaces. Figure 3. 05726 Radio Module Communications Interfaces 8
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.2-H 9
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