User's Manual

545C Operations Manual

02/10/2012 Prerelease DCN 00001789-A

5.1.4 Unit Identification and Factory Settings

Unit ID

Every MCC unit is programmed at the factory with a 16-bit unit ID. This

allows up to 65,536 unique ID numbers per network. Type the command ID

and press [ENTER] to display the unit ID number on the operator terminal.

In some cases this number will be “locked” and cannot be changed in the

field; you can type LOCK to determine if the ID is locked or not.

Under some circumstances the ID may have to be changed on-site. It can

only be done if the ID is not locked. In that event, this action must be

coordinated with both MCC and your System Administrator. Failure to do so

may result in data or messages being misrouted or lost. In addition, the

network topography and statistics will receive incorrect data that will

impair network performance.

To change the ID, enter the following command:

ID,nnnnn,mmmm{,aaaaa},INIT

where:nnnnnn = unit ID

mmmm = Master Station assignment

aaaaa = Master select mode: PREF, AUTO, MULTI, or FIXED

Obtain the proper Master Station assignment and select mode from your

System Administrator. The MCC-545C will save this ID and will use it

whenever the unit is powered up or reset.

Mode Description

PREF

Unit connects to the

mmmm

Master Station for the

NDOWN

period (set with

SNP command). After NDOWN period unit connects to the Master Station

that it has received the most syncs from. In this mode the unit can

communicate with only one Master at a time.

AUTO

Unit connects to the

mmmm

Master Station, if it is not successful it

switches to another Master Station. It will stay with that Master Station as

long as it can communicate with it. In this mode the unit can

communicate with only one Master at a time. This is the standard

mode for FleetTrak™ networks.