| 摘要 |
PURPOSE:To perform data transmission efficiently and to make the switching easy between a master station and slave stations with a simple constitution using registers, by the transfer of the right of lead of the main station to slave stations which process a lot of information with high emergency. CONSTITUTION:A data transmission control system consists of a main station bein a conrrol station and a plurality of slave stations which can become the control station, and the control system with this constitution is provided with a transmission control section 5 controlling the transmission line and a main station and slave station designation register 6. When the master station receives a master/slave switching request from a slave station, the master station transmits commands to the slave station and outputs a signal P from the section 5 to invert the register 6 and it is switched to the slave station with a signal Q. A slave station which receives the commands from the master station through a transmission line L outputs a signal R to invert the register 6 to switch the control into the master station control with the signal Q. The switching of the master and the slave stations can be made easy with a simple constitution using the register 6. |
