| Pin | Value |
| 1 | Protected Power |
| 2 | J1939 S-CAN (+) |
| 4 | J1939 K-CAN (+) |
| 7 | Ignition Power |
| 8 | Ground |
| 9 | J1939 S-CAN (-) |
| 11 | J1939 K-CAN (-) |
A V3 or V4 telematics unit connected with a Zonar RP1226 cable will:
- Use Switched Battery (called Protected Power in the table) as the power source instead of Battery (which is not available from all OEMs). This means the V3 or V4 could be behind a kill switch.
- Use Ignition as the white-wire source instead of using the loopback wire. This means the V3 or V4 will wake up on key-on instead of waking up on CAN data.
- Receive J1939 data from CAN_1 (S-CAN in the table).
J1939 data that is available on the RP1226 connector may vary between OEMs, just as data available on a 9-pin diagnostic connector may vary.
RP1226 is a "recommended practice" from the 2015 TMC (the ATA's Technology and Maintenance Council). It is a new way for telematics providers to connect to the vehicle.
It is a standardized connector for telematics devices to plug into heavy duty vehicles as an alternative to the 9-pin diagnostic connector.
A few facts:
- PACCAR is encouraging customers to use the RP1226 connector. They suggest any problems caused by other installation methods would not be covered by warranty.
- The Next-Gen Cascadia from DTNA does not have terminating resistors that are accessible for backbone installations (starting August 2019).
- Volvo and Navistar are using RP1226 on some vehicles.