The MX4 expansion module provides temperature and frequency input capability to existing and future Murphy Controllers using CANBUS proprietary communications. Modbus® RTURS485/RS232 is also provided for other communication requirements. The MX4 module adds up to 18 thermocouples and 1 mpu. The MX5 expansion module provides input/output capability to existing and future Murphy Controllers using CANBUS proprietary communications. Modbus® RTU RS485/RS232 is also provided for other communication requirements. The MX5 module adds up to 24 Digital inputs, 8 Digital outputs, 10 Analog inputs, and 1 mpu. The MX5-A adds an additional 4 Analog outputs to the base MX5. The MX5-D adds an additional 8 Digital outputs to the base MX5. Any mix of MX-Series modules can be added to enable Digital and Analog I/O, and Thermocouple inputs for communication and monitoring by the master controller.