TransCore 05716 Manuel D’Utilisation

the command message contains Error, Done, or data relating specifically to the 
command request. These messages may be of variable length since some commands 
require information as part of the message; for example, Display ATA Mode Status. 

Communications can be lost if the host computer attempts to send certain commands 
under marginal communications conditions. For example, if the host computer trans-
mits the command request to change the baud rate and the MPRR properly receives 
the request and transmits the

Done

message, one of the two following conditions may 

occur:

If the host computer receives the Done message, then both the host and the 
MPRR switch to the new baud rate, and communications are maintained. 

Note:  The MPRR changes the baud rate immediately after issuing the Done message.

However, if the host does not receive the Done message transmitted by the 
MPRR, the host assumes that the command was not properly sent and does not 
switch to the new baud rate, causing a loss of communications. 

In download mode, the MPRR allows the host to download new software.

While in download mode, the reader communications port parameters are fixed at the 
following factory-default settings: 38400 baud, 8 data bits, 1 stop bit, no parity, soft-
ware flow control (XON/XOFF), basic protocol.

While in download mode, the MPRR turns RF off, does not process tags, and does not 
echo host commands.

Reader commands are divided into groups based on primary function. The following 
sections provide information about each command in command number order. Refer 
to Appendix 

 for listings of commands in numerical and alphabetical order.

In the following text, the symbols < and > represent variable message data. These 
symbols are not part of the message syntax.

Hex digits (0–9, A–F) in either uppercase or lowercase characters may be used in data 
strings and for hex digits A–F.