| 摘要 |
PURPOSE:To economize power consumption in a slave station, by supplying the electric power to a polling response circuit only when a polling detection circuit of the slave station has detected polling to its own station from a master station. CONSTITUTION:Both the polling detection circuit 5 and the polling response circuit 6 are operated by receiving the electric power supply 7, but feed to the polling response circuit is usually kept stopped by the switch 8. And, when the polling detection circuit 5 has detected the polling to the own station from a master station, the switch 8 is operated by generating a switch control signal 9 by a time required for a response to the master station, and the electric power 7 is supplied to the polling response circuit 6. |
