Earlier Curtis CAN controllers adhere to the CAN2.0B standard, but run proprietary higher-level protocols called Curtis Nodes 1.0 and Curtis Nodes 2.0. Most recent Curtis controllers adhere to the CANopen protocol and support the DS401 IO-device profile standard. SAE J1939 is an alternate higher-level protocol that is commonly used for IC engine-powered vehicle applications, such as agricultural vehicles, construction vehicles, and automobiles. CANopen has become the standard communication bus for most electric vehicle applications including forklift trucks and other materials handling vehicles. CANopen is an international standard, and is a higher-layer CAN protocol for embedded control systems. It was originally designed by Bosch specifically for automotive applications. A controller-area network (CAN or CAN-bus) is a serial communications bus standard, allowing electronic control modules to communicate with each other within a vehicle.
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