| 摘要 |
PURPOSE:To obtain a system at a low cost, by constituting so that one display part can be selectively connected to plural control loops, and also transmission and reception can be executed to a DDC display part except an operation output part, by the use of a bit serial data. CONSTITUTION:In case when a signal is transmitted and received between a DDC11a and an analog display part 18, a selecting switch 21 is closed to the side of a fixed contact 21a. As a result, relays 20a, 20a are energized, contact 20a-1... are closed, and the DDC11a side and an analog display part 18 are connected through signal lines 19-1-19-8. Also, in case of transmitting and receiving a signal by a DDC11b and the analog display part 18, when the selecting switch 21 is closed to the side of a fixed contact 21b, relays 20b, 20b are energized in the same way as above, and as a result, the DDC11b and the analog display part 18 are connected. On each DDC11 and the analog display part 18, a transmitting device is provided by converting a parallel bit to a series bit, and the number of transmission lines is decreased. |
