Single Wire CAN

Single wire CAN is a physical layer that was created by General Motors. It allows CAN communication using a single wire at low bit rates such as 33.3 Kbps. It allows a high speed mode for flash programming. Finally, while most can transceivers offer only a 1 or 0, single wire can offers a third state called high voltage mode. This mode enables selectable power management of CAN nodes.

This shows two different Single Wire CAN frames. One transmitted in high voltage mode and the other the normal voltage.