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 (refer to SAE J1939-11), the unshielded twisted pair (refer to SAE J1939-15), the twisted pair (refer to SAE J1939-14), and the twisted unshielded quad media (refer to ISO 11783-2).