The Murphy Display and Diagnostic Module (MDDM) is the keystone in a line of components manufactured by FWMurphy 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