SAE J1939-13 specifies the diagnostic connectors used for off-board connection to a vehicle's SAE J1939 communication links. The defined diagnostic connectors support connection to the twisted shielded pair media (SAE J1939-11), the Reduced Physical Layer unshielded twisted pair (SAE J1939-15), the unshielded twisted pair of SAE J1939-14, as well as the twisted unshielded quad media (ISO 11783-2).
SAE J1939/13-2011 Referenced Document
ISO 11783-2:2002 Tractors and machinery for agriculture and forestry - Serial control and communications data network - Part 2: Physical layer
ISO 11898:1993 Road vehicles; interchange of digital information; controller area network (CAN) for high-speed communication
SAE J1708-2010 Serial Data Communications Between Microcomputer Systems in Heavy-Duty Vehicle Applications