TransCore 05716 Manuel D’Utilisation

Upon receiving a host command, the MPRR echoes the 
command’s sequence number in its response. Therefore, the host 
computer updates its sequence number upon receipt of a valid 
reader message. If the sequence number is not updated before 
transmission of the next command, the MPRR will not service the 
new command; it will retransmit its previous message. A 
command/message sequence is not complete until the host 
updates its sequence number.

<cmd>

Command code, a string that contains from two to four ASCII 
hex characters

[<data>]

Optional data field, an ASCII string of as many as 20 characters 
in length. For example, the store hardware configuration string 
command is #696S...S or command #696 Store Hardware 
Configuration String followed by the data string S...S.

<crc>

CRC value for the message

<eom>

End-of-message character (ASCII CR)

The basic protocol format is

<som><resp><eom>

The ECP format is

<som><seq><resp><crc><eom>

where

<som>

Start-of-message (ASCII # character)

<seq>

Echo of sequence number received in host command message

<resp>

Response string. The MPRR returns

Done

, Error, or another 

ASCII string depending on the host transmission. This string can 
be up to 72 characters long.

<crc>

CRC value for the message

<eom>

End-of-message character (ASCII CR and LF)

This section contains examples of typical messages transmitted between the MPRR 
and the host computer.