CAN bus automatic coding circuit and method

Abstract

The present invention belongs to the CAN bus circuit, and especially relates to a CAN bus automatic coding circuit. The circuit comprises a host module and a slave computer module. There are at least two slave computer modules, the slave computer modules are in cascade connection with the host module, the host module can send detection frames and an encoding command to the slave computer module, and the detection frame can detect whether the slave computer module ID is an initial fixation ID or not; the slave computer module comprises a CAN transceiver and a communication cascade switch, the CAN transceiver is provided with an external outgoing line, the CAN transceiver of the first-grade slave computer module is connected with the host through the external outgoing line, one end of the communication cascade switch is connected with the external outgoing line of the CAN transceiver of this grade slave computer module, the other end of the communication cascade switch is connected with the external outgoing line of the CAN transceiver of the next-grade slave computer module, and the slave computer module completes the automatic switching of the communication cascade switch after the encoding is completed. The CAN bus automatic coding circuit employs the communication cascade switch to realize automatic encoding to simplify the circuit and improve the encoding efficiency and has high stability. The present invention further provides a CAN bus automatic coding method.

Description

technical field [0001] The invention belongs to a CAN bus circuit, in particular to a CAN bus automatic encoding circuit and an encoding method. Background technique [0002] CAN bus is a two-wire differential bus communication method. Multiple CAN transceiver nodes can be connected to the bus at the same time for bus-type data transmission. Since multiple nodes share the bus, each CAN transceiver node needs to have an independent ID number. , At present, the address of each transceiver node on the CAN bus on the market needs to be manually coded, which is inefficient, increases the complexity of the production process, and is prone to errors. In the maintenance and repair stage, it is necessary to match the ID number to replace the module, and this part of the work can only be achieved by professional manufacturers. [0003] In order to solve the above technical deficiencies, there is currently a CAN bus node automatic coding technology on the market, which adds additional...

AI Technical Summary

Problems solved by technology

[0004] However, this automatic coding method is inefficient, and additional cables are added, which increases wiring costs, complex wiring harnesses, and many interfaces, reducing product reliability

Images