j1939 standart Off-Board Diagnostic Connector Reduced Physical Layer, 250K bits/sec, Un-Shielded Twisted Pair (UTP)Data Link Layer Network Layer

通讯的物理介质为双绞线，通讯波特率为250kbps，采用CAN2.0B支持扩展帧，intel格式，TCU无需自带120欧姆终端电阻，通讯网络基于SAEJ1939协议。(The physical medium of communication is twisted pair, the communication baud rate is 250kbps, CAN2.0B supports extended frame, Intel format, TCU does not need 120 ohm