PURPOSE:To attain the connection of many various slave stations, by performing management between slave stations connected to plural transmission lines at a master station, in a communication equipment where the master station and the slave stations are connected with the transmission lines and communicated by the polling signal. CONSTITUTION:The master station 1 managing the transmission is connected with the slave stations 11-1n, 21-2m, k1-kp via plural transmission lines l1, l2...lk. The communication between the master station 1 and the slave stations 11, 12...kp is performed by the polling signal from the master station 1. Further, the data of the slave station 11 on, e.g., the transmission line l1 is outputted to the slave station 2m on the transmission line l2 via the master station 1. Thus, the total distance of the transmission lines is doubled and the number of sets of connection of the slave stations is increased. Further, the data transmission and receiving of the slave stations on different transmission lines is attained.
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