Command Mode
While the MPRX is in the command mode, the host device sends commands to the MPRX that can be
used to control the reader operation and configuration. After the MPRX receives a command, it transmits
a command response message. Typically, 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, #570 Display Operating Mode
Status.
Communication can be lost if the host device attempts to send certain commands under marginal
communication conditions. For example, if the host device transmits the command request to change the
baud rate and the MPRX properly receives the request and transmits the #Done message, one of the two
following conditions may occur:
1. If the host device receives the #Done message, then both the host and the MPRX switch to the
new baud rate, and communications are maintained.
Note: In many applications, the host must be set to the new baud rate as it does not change
automatically. The MPRX changes the baud rate immediately after issuing the message.
2. If the host does not receive the #Done message transmitted by the MPRX, the host assumes that
the command was not properly sent and does not switch to the new baud rate, causing a loss of
communications.
Caution
The host device should only change communications parameters or protocols during test or
set up conditions.
Download Mode
In download mode, the host can download new software to the MPRX.
While in download mode, the MPRX turns RF o, does not process tags, and does not echo host
commands.
Typically, TransCore trained personnel download new application code using a custom firmware loader
program. Contact TransCore Technical Support for information about firmware updates and procedures
Chapter 5 Commands
TransCore Proprietary
5–57
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