J1939-to-DB9/DB9 Adapter (Deutsch 9-Pin, 2 x CAN)
Some heavy-duty vehicles expose two J1939 networks through a single Deutsch 9-pin connector. This adapter lets you tap both at once. Connect your CAN logger or interface directly to the Deutsch connector and log the primary J1939 network on Channel 1 and the secondary network — J1939 or ISOBUS — on Channel 2. One cable, two channels, one log file. Available in two pinout variants to match your vehicle's wiring: H+J — accesses the secondary network via pins H (CAN-H) and J (CAN-L). F+G — accesses the secondary network via pins F (CAN-H) and G (CAN-L). The Type II connector is backward-compatible with both black (Type I) and green (Type II) Deutsch connectors, so it works across a mixed fleet without adapters. Note: We primarily recommend using a J1939-DB9/DB9 adapter cable if you know that there is a secondary J1939 network available - and if you know that you'll need data from it. In most use cases, a standard J1939 adapter cable will be sufficient to give you access to the necessary data. Adapter pinout: J1939-DB9/DB9 (H+J) J1939 Function DB9 - CH1 DB9 - CH2 A GND 3 N/C B VCC 9 N/C C CAN-H CH1 7 N/C D CAN-L CH1 2 N/C E N/C N/C F N/C N/C G N/C N/C H CAN-H CH2 N/C 7 J CAN-L CH2 N/C 2 Adapter pinout: J1939-DB9/DB9 (F+G) J1939 Function DB9 - CH1 DB9 - CH2 A GND 3 N/C B VCC 9 N/C C CAN-H CH1 7 N/C D CAN-L CH1 2 N/C E N/C N/C F CAN-H CH2 N/C 7 G CAN-L CH2 N/C 2 H N/C N/C J N/C N/C Order Options SKU Pin Access Manufacturer Part # (MPN) GC-CSS-DB9-DB9-J1939-CABLE-HJ H + J A024 GC-CSS-DB9-DB9-J1939-CABLE-FG F + G A025