Display and Diagnostic Module
Display and Diagnostic Module


  • Specifically designed for SAE J1939 Controller Area Network (CAN) equipment applications
  • Displays over 30 standard SAE J1939 parameters broadcast by major engine and transmission manufacturer's ECM's
  • Displays active faults and ECM stored fault codes for diagnosing equipment malfunctions
  • Re-broadcasts critical data to MLink Analog Gages



The Murphy Display and Diagnostic Module (MDDM) is the keystone in a line of components manufactured by FW Murphy as part of its J1939 MurphyLink System. The J1939 MurphyLink System has been developed to meet the needs for instrumentation and control on electronically controlled engines communicating using the SAE J1939 Controller Area Network (CAN). The MDDM is a powerful, easy to use multifunction tool that enables the operator to view many different engine parameters and engine service codes.


The MDDM includes a two line by eight character back-lit LCD display. The top line displays data labels, i.e. "EngHrs". The bottom line displays appropriate units information i.e. "80 psi" for oil pressure.


The UP and DOWN push buttons located on the front of the MDDM, are used for scrolling through the parameters and viewing the menu list. Two LEDs (amber and red) are used to annunciate active fault messages received by the MDDM. Other components in the system are microprocessor-based analog gauges for displaying critical engine data broadcast by the ECM: engine RPM, oil pressure, coolant temperature, system voltage, etc., a combination audible alarm and relay unit for warning and shutdown annunciation. Up to 32 components may be linked to the MDDM by an RS485 daisy chained twisted pair cable up to 1,000 meters from the MDDM. The MDDM and all connected components can be powered by 12 or 24 volt systems, are back lit using LEDs, and are 100% environmentally sealed.



The Murphy Display and Diagnostic Module is a low-cost solution for your instrumentation needs on stationary or mobile equipment applications.


Download PDF

Please fill the form to download the PDF