| 摘要 |
A communication system comprising a master station and a plurality of slave stations connected for serial transmission by a transmission line, using a HDLC-type protocol. Each of the slave stations is equipped with a system counter and a control timing setting register. Each slave station receives data when address information included in a transmission frame sent by the master station matches its own address and presets the system counter so that control timing for the object to be controlled by the master station matches the timing by the one or more slave stations. As a result, plural slave stations can output a control signal which matches the control timing for an object to be controlled by master station when the contents of the system counter match the contents of control timing setting register. The predetermined value may be preset and may be based on a collection of actual control timing data between the master station and each slave station. <IMAGE> |
