| 摘要 |
PURPOSE:To attain normal transmission, even if one line is broken, by connecting a master station and a plurality of slave stations with a duplex loop and taking logic with a signal from the master station inputted bidirectionaly at a slave station, in a multiple signal transmission system performing data communication between the master and slave stations. CONSTITUTION:A double loop is formed for a master station 1 and a plurality of slave stations 2, 3 with left hand revolving transmission lines 4, 5, 6 and right hand revolving transmission lines 7, 8, 9 which are toward opposite direction with each other. The slave stations 2, 3 transmit data when the master station invites the transmission of each slave station. When an invitation signal from the master station is obtained from the two transmission lines of opposite direction, data are transmitted to both lines only when the invitation signal from the two lines are coincident, and when the invitation signal from the master station is for one transmission line only, the data are transmitted to the transmission line. |
