General CAN bus test communication circuit who examines test table of four commercial vehicle combination meter in state

The utility model discloses a general CAN bus test communication circuit who examines test table of four commercial vehicle combination meter in state, a serial communication port, including CAN bus interface chip TJA1050, filter circuit, LED status?display circuit, CAN bus interface chip TJA1050 send for the bus provides differential with differential receiving performance, CAN bus interface chip TJA1050's input is connected with filter circuit for the power is high, low frequency filter and decoupling, the pin is sent and receives to TJA1050's pin CAN_Tx, the CAN bus that CAN_Rx connects outside singlechip controller respectively, and TJA1050's two -way port CANH, CANL treat through common mode inductance wave filter and outside that test instrument is connected for common mode interference signal in the filtering CAN bus, the LED status?display circuit is connected with outside singlechip controller, is used for showing the state information of detector transmitter data. 本实用新型公开了国四商用汽车组合仪表通用检测台的CAN总线测试通信电路