scope:

This part of ISO 15765 specifies a transport protocol and network layer services tailored to meet the requirements of CAN-based vehicle network systems on controller area networks as specified in ISO 11898-1. It has been defined in accordance with the diagnostic services established in ISO 14229-1 and ISO 15031-5, but is not limited to use with them and is also compatible with most other communication needs for in-vehicle networks. ISO 11898-1 specifies variable length CAN frames with a maximum payload size dependent on the protocol device used. A CLASSICAL CAN protocol device can transmit/receive frames with payload sizes ranging from 0 to 8 bytes per frame. A CAN FD (Flexible Data Rate) protocol device can transmit/receive frames with payload sizes from 0 to 64 bytes. A CAN FD protocol device is also capable of transmitting/receiving CLASSICAL CAN frames.