| 摘要 |
PURPOSE:To relieve the load of the software of a main CPU by using a time division multiplex transmission circuit separate from the main CPU so as to generate a parity word or the like to a transmission data and check the correctness of received data. CONSTITUTION:A multiplex transmission LS12 receiving a data from a terminal device executes the discrimination whether or not a format of the reception data is a correct form (format check). As the result of format check, if it is discriminate that a correct correspondence result is obtained, only a data part DATA is returend to the main CPU1 or the data DATA and a PT are returned to the main CPU1 by setting of the reception function the same as the transmission function. Since the main CPU1 can know accurately the state of the terminal device by referencing the returned data, proper control in response to the application of an object device being a slave station is attained. |
