Operations Manual

OPERATIONS 4-21
O&M of the MCC-545B PACKET DATA RADIO
12/2000
4. The 545B must transmit in half-duplex mode, due to its built-in T/R switch. Set transmit
mode to half-duplex by typing:
HALFDUPLEX
IMPORTANT
The 545B cannot communicate using full-duplex mode. If you place the 545B in full-duplex
mode (in order to simulate a full-duplex Master), the 545B's receiver is disabled by the built-in
T/R switch.
The 545B can use two different "roles" when generating probe signals (see also the explanation
of the P command following step 6).
If you want to generate repeated probe signals (like a Master Station's "idle" or enquire
probe), set 545B role to probe by typing:
ROLE,PROBE
If you only want to produce single pulse probes (for testing an individual Remote's
responsiveness), or to probe very slowly, set 545B role to transpond by typing:
ROLE,TRANSPOND
Optionally, you can set the low and high threshold numbers for determination of LOS
operation when setting ROLE to TRANSPOND and/or the initial state of the mode (MB
or LOS). When operating in the LOS mode, the 545B waits a random number of idle
probes between each probe.
6. The 545B's ID must match the assigned Master ID for the Remote unit(s) being probed.
Set ID by typing:
ID,n,INIT
where "n" is the assigned Master ID of the Remote unit.
IMPORTANT
If you change the 545B's ID, the software reboots after you enter the INIT parameter and press
[CR]. The SAVE command is automatically performed, ensuring that your configuration
changes are kept in EEPROM (and not lost after power cycling). However, if you do not need to
change the 545B's ID (i.e., it was already set to the same ID as the Remote unit's assigned
Master), make certain you use the SAVE command before starting to probe or any configuration
changes you have made will be lost if the 545B is rebooted.