Principles of Operation

The message center electronic functions use both hardwired, standard corporate protocol (SCP), and UART based protocol (UBP) communication networks to transmit and receive information. It is very important to understand:

• where the input (command) originates from.
• all the information (messages) necessary in order for a feature to operate.
• which module(s) receive(s) the input or command message.
• does the module which received the input (message) control the output of the feature, or does it output a message over the SCP or UBP communication network to another module?
• which module controls the output of the feature.

The message center provides the following features:

• information displays
• setup displays
• warning messages
• system check messages

The message center information can be selected through a set of three switches:

• INFO
• SETUP
• RESET