What is CAN protocol?

CAN protocol, that is, Controller Area Network (CAN), is a serial communication protocol bus for real-time applications. It can use twisted pair to transmit signals and is one of the most widely used field buses in the world.

CAN protocol is used for communication between various components in automobiles, replacing the expensive and bulky distribution wiring harness. The robustness of this protocol extends its application to other automation and industrial applications. The characteristics of CAN protocol include complete serial data communication, real-time support, transmission rate as high as 1Mb/s, addressing as 1 1 bit, and error detection capability.

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Features of CAN bus:

(1) has strong real-time performance, long transmission distance, strong anti-electromagnetic interference ability and low cost.

(2) Using two-wire serial communication mode, it has strong error detection ability and can work in high noise interference environment;

(3) It has priority and arbitration functions, and multiple control modules are hung on the CAN bus through the CAN controller to form a multi-host LAN;

(4) You can decide to receive or block the message according to its ID;

(5) Reliable error handling and error detection mechanism;

(6) After the sent information is destroyed, it can be automatically retransmitted;

(7) The node has the function of automatically quitting the bus when there is a serious error;

(8) The message does not contain the source address or destination address, but only uses the identifier to indicate the function information and priority information.

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