J1939 to DB9 Cable (Deutsch 9-Pin)
This J1939 to DB9 cable connects a logger or interface to most heavy-duty vehicles. Most trucks, buses and many tractors and construction machines have a 9-pin Deutsch J1939 diagnostic socket in the cab. This 1.5 m cable connects it to the DB9 port of a CANedge logger or CANsub interface, giving direct access to the J1939 network.
Unlike an OBD2 cable, it also carries vehicle power to the DB9 power pin, so a CANedge can run straight from the diagnostic socket with no extra wiring. The Type 2 connector fits both older and newer (green) J1939 sockets.
Highlights
Pin-out
| DB9 pin | Signal | Vehicle side |
|---|---|---|
| 2 | CAN-L | Deutsch pin D |
| 3 | GND | Deutsch pin A |
| 7 | CAN-H | Deutsch pin C |
| 9 | Power (VCC) | Deutsch pin B |
DB9 pins follow CiA 303-1. Other pins are not connected.
Where it earns its keep
- Truck and bus telematics: install a CANedge on the diagnostic socket in minutes
- Off-highway machines: log J1939 data from tractors, loaders and generators with a 9-pin socket
- Diagnostics: connect a CANsub interface to read J1939 traffic and DM1 fault codes live
- Fleet rollouts: one standard cable for most heavy-duty vehicles
Key Specifications
| Spec | Value |
|---|---|
| Connectors | J1939 Deutsch 9-pin (Type 2, female) to DB9 female |
| DB9 pin-out | CiA 303-1 (CAN-L 2, GND 3, CAN-H 7, power 9) |
| Cable length | 1.5 m |
| Wire gauge | 22 AWG (0.5 mm²) |
| Compatibility | High-speed CAN (ISO 11898-2), CAN FD, J1939, NMEA 2000 |
| Operating temperature | -20 °C to +80 °C |
| Weight | 180 g |
Frequently asked questions
Does it power the logger?
Yes. Vehicle power from Deutsch pin B is routed to DB9 pin 9, which powers a CANedge directly. The CANsub is powered over USB or PoE instead.
What does Type 2 mean?
Type 2 (Type II) connectors fit both the older black 250 kbit/s sockets and the newer green 500 kbit/s J1939 sockets.
What if my vehicle has a different connector?
CSS Electronics offers DB9 adapters for many others, such as OBD2, Caterpillar, Volvo Penta and RP1226. Contact us with a photo of the socket and we will find the right cable.
Need a quote or help choosing the right setup? Contact Pertech, the CSS Electronics distributor in Israel.
