E&C Serial Data Line

The E&C serial data line is a UART based communication system. UART serial data lines have a master of serial data line and remote transceivers. The master of this data line is the HVAC programmer. The master controls the message traffic on the serial data line by polling all of the remotes (control modules). The master then waits for the proper response. The control modules on the E&C data line can include:
^ The heater and A/C programmer
^ The radio
^ The Compact Disc (CD) player
^ The Remote Function Actuator (RFA) Module