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Tait T2000-A76 Operation Manual

Manual is about: AVL Modem

Summary of T2000-A76

  • Page 1

    T2000-a76 avl modem operation manual © tait electronics limited corporate hq: po box 1645, christchurch, new zealand. Tel: +64 3 358 3399 fax: +64 3 358 0340 web: www.Taitworld.Com/ march 2003 m2303-00-p00-805.

  • Page 3: Contents

    Contents section title page 1 overview 5 1 operation 6 2 compatibility 8 3 gps interfaces 9 4 programming the a76 12 5 operation sequences 14 6 commands to the remote radio 17 7 responses from the remote radio 21 8 ccdi reference 24.

  • Page 5: Overview

    March 2003 m2303-00-p00-805 5 1 overview the t2000-a76 avl modem is fitted as an options pcb within a t201x mobile radio. The avl enabled t201x radio collects and stores avl data from a gps receiver in its internal memory, which can then be relayed to central control equipment. A typical avl system ...

  • Page 6: Operation

    6 m2303-00-p00-805 march 2003 2 operation features the a76 modem in the t201x radio performs the following avl functions: • avl data collection from the gps receiver • simple avl polling by the despatcher radio • group avl polling by the despatcher radio • emergency unsolicited avl reports to the de...

  • Page 7: Ptt Activated Avl Reporting

    March 2003 m2303-00-p00-805 7 ptt activated avl reporting the a76 can be configured to send an unsolicited avl report each time the ptt is pressed or released. Refer to the ptt activated avl reporting section. Ffsk tone blanking tone blanking is used for applications in which voice and data share th...

  • Page 8: Compatibility

    8 m2303-00-p00-805 march 2003 3 compatibility t201x radio firmware when programming the t201x radio firmware for use with the ccdi, use version 3.01 or greater. Retrofitting an a76 avl modem into a t201x radio, radios require radio firmware version 2.22 or later. If your radio uses an earlier firmwa...

  • Page 9: Gps Interfaces

    March 2003 m2303-00-p00-805 9 4 gps interfaces rs232 interface the rs232 interface on the despatcher radio has the following parameters which are fixed in the radio modem firmware. For every byte sent, there are 10 bits sent including the start and stop bits: • number of data bits = 8 • parity = non...

  • Page 10

    10 m2303-00-p00-805 march 2003 rs232 from remote radio to gps receiver the nmea data transfer between the remote avl radio and the gps receiver uses only the rxd data line. Cts and rts are used to active/deactivate the aux control line and emergency mode respectively. Nmea-0183 rmc sentence format t...

  • Page 11

    March 2003 m2303-00-p00-805 11 note: the shaded rows define the sentence segments that are not sent by this application of the rmc sentence format. N latitude reference n = north s = south 12345.123 longitude 123 degrees : three fixed digits 45.123 minutes : two fixed digits plus up to three optiona...

  • Page 12: Programming The A76

    12 m2303-00-p00-805 march 2003 5 programming the a76 before the a76 can operate, the radio must be configured correctly. The program command is used to set up the default configuration of the a76. An tait pc application is available for this. As the serial port of the a76 is expecting nmea data, the...

  • Page 13

    March 2003 m2303-00-p00-805 13 [item2] avl report delay time : default = 10h (1600ms) two ascii hex characters. The time that the a76 delays after receiving an poll command until it sends back the response sdm. Range : 01 to ffh (25600) in steps of 100 ms. Refer to the section. [item3] sdm lead in d...

  • Page 14: Operation Sequences

    14 m2303-00-p00-805 march 2003 6 operation sequences polling the remote avl radio a simple avl poll is sent from the pc avl application to the remote avl radio. The remote radio automatically responds with an avl report. The avl poll command is sent by the despatcher radio using a send_sdm command. ...

  • Page 15: Auxiliary Output Control

    March 2003 m2303-00-p00-805 15 auxiliary output control the auxiliary output from the a76 uses the rs232 cts line on the a76 serial port to switch external devices on or off. It can be remotely controlled by the despatcher radio by sending a aux on or aux off message. This feature can be enabled or ...

  • Page 16: Emergency Mode Activation

    16 m2303-00-p00-805 march 2003 emergency mode activation an emergency switch can be connected to the rs232 rts input on the a76 serial port. When the switch is activated, the avl radio sends an emergency avl report to the despatcher radio. The operation of emergency mode is controlled by the followi...

  • Page 17: Commands to The Remote Radio

    March 2003 m2303-00-p00-805 17 7 commands to the remote radio commands to the remote radio are sent using the send_sdm ccdi command. It has the format : s [lead_in_delay] [data_message_id] [command] [data] notes: the [data] field is only sent with some commands. The [command] and [data] fields are l...

  • Page 18

    18 m2303-00-p00-805 march 2003 [message] first byte function bit 0 - 2 parameter the parameter is set depending on the command type that is sent. Refer to the table below for the parameter options. Bit 3 return address 0 : the avl report is sent to the default despatcher address 1 : the avl report i...

  • Page 19

    March 2003 m2303-00-p00-805 19 command type bits 4,5 and 6 c parameters bits 0,1 and 2 a76 action / response poll 000 000 : poll the avl report. Always set to 000. 001 - 111 : the command will be ignored if a return address is sent, it is sent in the [data] bytes. Avl report is sent examples: [comma...

  • Page 20: [Data]

    20 m2303-00-p00-805 march 2003 [data] the [data] field is only sent if return address information and/or the group delay time data is required to be sent. Refer to the previous table for details. Note: addresses the default despatcher address is set during the configuration programming. Refer to the...

  • Page 21: [Response]

    March 2003 m2303-00-p00-805 21 8 responses from the remote radio commands sent to the remote avl radio generally require a response. The reset command is the only exception to this. The response from the remote radio is sent as an sdm. It has the format : [response] [data] the sdm is sent by the rem...

  • Page 22

    22 m2303-00-p00-805 march 2003 response type bits 4,5 and 6 radio status / ack parameters bits 0,1,2 and 3 avl report 000 bits 0 and 1 are used to send error handling information, where 00 : avl report sent with new data ok 01 : avl report sent with old data 10 : gps receiver down, no data sent, no ...

  • Page 23: [Data]

    March 2003 m2303-00-p00-805 23 [data] the [data] field contains either an avl report or other data dependent on the type of acknowledgement being sent. Refer to the previous table for acknowledgement details. Avl report note: if no avl data is received within 20 seconds or a format error occurs in t...

  • Page 24: Ccdi Reference

    24 m2303-00-p00-805 march 2003 9 ccdi reference the ccdi data protocol is used to send and receive commands from a ccdi capable modem in a radio. The a76 modem in the remote avl radio communicates with the despatcher radio using ccdi commands. To send and recieve messages using the over-air ccdi pro...

  • Page 25

    March 2003 m2303-00-p00-805 25 checksum example s0d050800testhi!Da 1. Take the modulo-2 sum of all message bytes preceding [checksum]. • s = 73h, 0 = 30h, d = 44h etc. Therefore the modulo-2 sum is: 73 + 30 + 44 + 30 + 35 + 30 + 38 + 30 + 30 + 54 + 45 + 53 + 54 + 48 + 69 + 21 = 426h 2. Retain bits 0...

  • Page 26: Get_Sdm

    26 m2303-00-p00-805 march 2003 get_sdm (despatcher radio to pc) solicited. The get_sdm message is sent to the pc in response to a query command. The modem sends the sdm text message which is saved in the eeprom. It has the format : s [sdm_data] example an example of a ‘get sdm’ message is: s05hello3...

  • Page 27: Progress

    March 2003 m2303-00-p00-805 27 progress (despatcher radio to pc) unsolicited. The progress message advises the pc of modem status when some significant change of state in the radio occurs (typically during call processing). It has the format : p [ptype] [para1] [parameter] function [ptype] a two-dig...

  • Page 28

    28 m2303-00-p00-805 march 2003 example an example of an ‘progress’ message is: p0207c7 message field parameter a76 response [ident] progress. P [size] size of parameter field 02 [parameters] [ptype] = 07; the ptt mic has been activated by the function command 07 [checksum] the checksum for the messa...

  • Page 29: Query

    March 2003 m2303-00-p00-805 29 query (pc to despatcher radio) the query command requests the modem to respond with data. The data can contain several types of information. It has the format : q [query_type] example an example of a ‘query’ message is: q012fc [parameter] function [query_type] a single...

  • Page 30: Send_Sdm

    30 m2303-00-p00-805 march 2003 send_sdm (pc to despatcher radio) the send_sdm command requests the modem to send a short data message (sdm). The pc sends the sdm directly to the a76, and the t201x immediately keys up the transmitter. After the specified sdm lead in delay the modem sends the sdm. It ...