J1850 application specific integrated circuit (ASIC) and messaging technique

A multiplexed communication system for controlling remote devices within a vehicle comprising:

• a master module having a processor and a communication port;
• a remote I/O module having a state machine and a plurality of communication ports;
• a J1850 data bus for providing bidirectional communication between the master module and the remote I/O module;
• and
• a message frame for communicating data between the master module and the remote I/O module, the message frame including a control message formatted by the master module for execution by the remote module, and the message frame including a response message formatted by the remote I/O module in response to the command message for providing feedback to the master module;
• said control message including a sub ID and an executable string of bits;
• said response message including two bytes of feedback data.

A multiplexed communication system for transporting an executable command message between a master control module and a remote device for executing the command message, the communication system comprising:

• a remote I/O module having a state machine and an internal data bus for processing the executable command message;
• a data bus for providing bidirectional communication between the master control module and the remote I/O module;
• a message frame for transporting the executable command message, the message frame containing command data and response data;
• the command data including a sub ID portion for identifying the remote device and a command message portion for containing an executable command, the command message portion being transmitted by the remote I/O module to the remote device;
• the response data including a response message formatted by the remote I/O module in response to the command message and transmitted by the remote I/O module to the master control module within a predetermined amount of time after receiving the command data.