TransCore AI142205618 Manuel D’Utilisation
5-3
Chapter 5
Command Codes
This chapter describes the default and diagnostic command codes that
enable you to develop host computer programs to control the functions
of the AI1422 Half-Frame Reader System.
enable you to develop host computer programs to control the functions
of the AI1422 Half-Frame Reader System.
Default Command Codes
The default command codes enable communications between the host computer and
the reader system. These codes, also referred to as the communications protocol, are in
a binary format. TransCore strongly recommends that a person with software writing
capabilities write this communications protocol.
the reader system. These codes, also referred to as the communications protocol, are in
a binary format. TransCore strongly recommends that a person with software writing
capabilities write this communications protocol.
The transponder identification (ID) can be 3 or 10 bytes, which corresponds to 2400 or
9600 baud, respectively. These bytes are 6-bits coded. See Appendix A, “Character
Conversion,” of this user guide.
9600 baud, respectively. These bytes are 6-bits coded. See Appendix A, “Character
Conversion,” of this user guide.
Asynchronous Reader Data Telegram
The reader system sends a data telegram when it reads a unique tag ID.
<7EH><7EH><01H><transponder count><transponder ID<CR>
Health Status Request
You will need to write a script file to download the following binary string for the
health status request.
health status request.
<7EH><7EH><40><CR>
The response is
<7EH><7EH><02H><Transponder count><host computer
telegrams-bad CRC><incomplete host telegram>
<Reserved><Reserved><Reserved>
<CR>
Retransmit Request
You will need to write a script file to download the retransmit request.
<7EH><7EH><42H><CR>
The response is
<7EH><7EH><01H><transponder count><transponder ID><CR>