Automatic topology identification method of point-to-point bidirectional link

The invention discloses an automatic topology identification method of a point-to-point bidirectional link. The automatic topology identification method of the point-to-point bidirectional link comprises the first step of scanning, wherein a master node sends a Scan message, slave nodes receive the message in sequence and Hop numbers are sequentially and gradually increased until the last node, the last node does not amend the content of the message, and a ScanAck message is generated to be sent to the former node in sequence until the master node receives the message; the second step of address assignment, wherein the master node carries out address assignment according to the obtained Hop NUMBERS, an AddrAssign message is formed and sent, the slave nodes receive the AddrAssign message in sequence and store the own addresses of the slave nodes until the last node, and the last slave node generates an AddrAssignAck message and sends the AddrAssignAck message to the former node until the master node receives the message. Manual intervention is not needed, and after the node equipment is installed, the topology scanning installation and node identification functions are automatically finished, the speed is high, and accuracy is high.