| 摘要 |
<p>PURPOSE:To decrease the data collection time and to prevent crosstalk, by giving functions of carrier detection and address discrimination of preceding stations to slave devices. CONSTITUTION:When a simultaneous callout data from a transmission line enters a reception section 2 via a terminal 6, a timer start signal is outputted from the section 2 to a transmission start timer 4 to start the timer. When simultaneous callout data or transmission data from other slave devices are received, the data are given to a preceding station address detector 8 from the reception section 2 and a carrier detector 9 is activated. When the data are given to the detector 8, a discrimination signal of the address of a slave station before by one from the transmission order assigned to the station itself with the address discrimination is outputted, and when no carrier is present and a signal carrier interruption is give, a transmission start signal is given to a transmission section 1 with an AND circuit 10 and a timer cancell signal is given to the timer 4.</p> |
