User's Manual

545C Operations Manual

02/10/2012 Prerelease DCN 00001789-A

The user should beware that it is possible to “get in trouble” using the

configuration process. For example, assume you accidentally set the

protocol for the operator port to MSC. If you do not have the ability to

interface using MSC protocol you will immediately lose contact with the

MCC-545C. You will no longer be able to issue commands. Power cycling

will not help either because your change will be retained in RAM, even

through power cycling. However, you can always recover by removing the

lid on the MCC-545C and pressing the Reset button (SW1). This will reboot

and restore the CPM settings.

Alternatively, assume you want to change the operator port to MSC. You

connect in ASCII protocol, command the change to MSC protocol, then

switch your PC to also use MSC protocol. Operation resumes and all is well.

But do not forget to do a SAVE. If the software ever reboots, it will revert

back to ASCII. And remember, once you do the SAVE you are committed to

MSC protocol. The Reset button now reboots to MSC and there is no easy

way back to the factory default settings. You will need an MSC capability to

command a change back to ASCII.

5.2.2 Setting frequencies

The MCC-545C is programmed at the factory with the authorized

frequencies to be used in your network. These frequencies are stored in

Parameter memory and cannot be changed.

You can display TX and RX frequencies by entering the following command:

FREQUENCIES

This shows you the active or “primary” TX and RX frequency pair, plus up

to 9 additional frequency pairs for channels that may be programmed at

the factory.