Master-slave board bus communication addressing system and addressing method

The invention discloses a master-slave board bus communication addressing system, which comprises a master board and a slave board, the main board comprises an OUT0 pin; each slave board comprises an INPUT pin and an OUT pin, the INPUT pin of the slave board located at the first position in the multiple slave boards is connected with the OUT0 pin of the main board, and the OUT pin of the previous slave board is connected with the INPUT pin of the next slave board; a level signal output by the OUT0 pin of the main board is sent to the INPUT pin of the slave board, and after the slave board completes addressing according to the received level signal, the INPUT pin of the next slave board receives the level signal to complete addressing; the invention further discloses a master-slave board bus communication addressing method. The slave boards are connected through the two additional IO ports, the OUT pin of the previous slave board is connected with the INPUT pin of the next slave board, the INPUT pin of the nex