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Truck-trailer link

ISO 11992-1 transceiver available again

Wabco has announced that its transceiver for truck-trailer networks is distributed by Blume-Elektronik. This gives third parties the chance to buy the ASIC and integrate it in ECUs.

In ISO 11992, two CAN-based truck-trailer networks are internationally standardized (Photo: Wabco)

The ISO 11992 series standardizes the communication between truck and trailer. Part 1 of this standard specifies the physical layer including the fault-tolerant transceiver. Part 2 standardizes the braking and running gear messages. This part is referenced by the ECE R13 regulation, which has been ratified by the European Community, Russia, South Africa, some other Far East countries, and Australia and New Zealand. Part 3 describes other messages (e.g. for lighting), which are transmitted on a separate CAN network.

The two CAN networks are point-to-point links. Originally, Temic manufactured the ISO 11992-1 transceiver. When the company discontinued the production, Wabco designed its own ASIC, which was produced by ON Semiconductors. Knorr-Bremse, the main competitor of Wabco, was allowed to use the same transceiver in its ECUs. Other parties could not get the ISO 11992-1 transceiver. This has changed recently. Now, Wabco distributes its transceiver via Blume-Elektronik. The chip features fault-tolerance by means of a single-wire communication function.

The ISO standard, which has been established for more than 15 years, is used in all European trucks and trailers for braking applications. This includes the optional ABS and ESP functionalities. Every year, several hundred thousands of ECUs are equipped with this chip.

Update for the ISO 11992 standard

As usual, the ISO systematically reviews its standards. Part 1 and part 3 are currently under review. It is intended to include a lane departure monitoring function into part 3. Part 2 (braking and running gear) and part 4 (diagnostic) were updated two years ago. The two network standards (part 2 and part 3) support the connection of up to five trailers, each connected by a separate network segment. The application layer is based on the J1939 protocols. The SPNs and PGNs are harmonized with SAE.

In the CiA 413 interface profile, all these parameters are mapped to the CANopen object dictionary. This makes it easy to use a CANopen-based network on the trailer or on the truck for body applications. Iveco optionally provides a CANopen gateway for body-builders.


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