| 摘要 |
PURPOSE:To eliminate the need for a hard change just with the connection secured between a part to be controlled and a control part via a signal line, by performing detection every part to be controlled and fetching data with a prescribed key code. CONSTITUTION:A clock pulse CLK is transmitted from a terminal 5 of a control part 3, and a key code KC and data DT are serially transmitted in response to push of operation keys 2a-2n. While shift registers 12 and 21 which fetch the code KC and the data DT to parts 1a-1n to be controlled on the basis of the pulse CLK are provided together with a circuit 13 which produces a detection signal if the code KC fetched to the register 12 is equal to a prescribed one, a circuit 15 which counts the detection signal of the circuit 13 and produces a detection signal when said count value reaches a prescribed level and a data fetching circuit consisting of gate circuits 19 and 20 which supply the pulse CLK and the data DT to the register 21 between detection signals of circuits 13 and 15. |
