| 摘要 |
<p>PURPOSE:To attain communication with plural slave stations with circuits of simple configuration and simple control by providing an OR means ORing data received from slave stations and a discrimination means discriminating a sender slave station number to a master station. CONSTITUTION:When a master station 2 makes communication with a slave station, an input port from plural slave stations is connected to a communication port 10 via an OR means 30 and connected to a discrimination means 40. Upon receipt of a data from a slave station, the discrimination means 40 discriminate a sender slave station number of a data and generates a discrimination flag based on the result of discrimination and sends it to a processing unit 20. On the other hand, the OR means 30 Ors the received data and inputs the result to the processing unit 20 via a communication port 10 and the processing circuit 20 discriminates from which slave station the data comes based on the received discrimination flag and applies processing to the data. Thus, the communication with plural slave stations is attained with circuits of simple configuration and simple control.</p> |
