TransCore MPRX Series - Chapter 3 General Software Information; Command Entry Conventions; Command Response Conventions; Table 10 Four-Character Command Structure

Chapter3 General Software Information
Command Entry Conventions
All MPRX commands are preceded by the start-of-message character (#). The end-of-message sequence
expected from the host is a carriage return (CR). The MPRX terminates messages with a return and a line-
feed (CR/LF). For example, the command #01 Switch To Command Mode is typed as follows:
#01<ENTER>
where
<ENTER> is the Enter or Return key.
Some command characters may be represented by the letter N. This letter indicates you are to supply a
value. Maximum valid entries are the numbers 0 through 9 and the uppercase letters A through F. These
letters allow for as many as 16 available user responses and are based on the hexadecimal numbering
system.
Commands have at least two characters following the # character. Table 10 shows the basic structure of a
four-character command.
Table 10 Four-Character Command Structure
#1005 Set Baud Rate To 9600 Baud
# All commands are preceded by the # character.
1
Indicates the command group. This command is in Group 1 –
Communications Port Control.
0
Indicates the command subgroup. In this example, all commands
with a second digit of 0 apply to the main port.
0
The command digit. In this example, the 0 indicates that this
command aects the baud rate.
5
Indicates the setting. Normally this is a variable and is usually a
hexadecimal value from 0 through F. In this example, 5 sets the
baud rate to 9600, the factory setting. In some commands, this
digit may be a four-place hexadecimal string or a character string.
Command Response Conventions
Like the MPRX commands, responses are preceded by the # character. Many MPRX commands respond
with #Done or #Error indicating the command was or was not recognized and completed. Other
commands respond with a four-character identifier followed by one or more values.
Table 11 shows an example of a command/reply sequence. This example assumes that an MPRX with
serial number SN97001P running version X.XX software is connected to a PC running a terminal emulation
software package. The command sequence verifies that communications are working correctly.
MPRX User Guide
TransCore Proprietary
3–38