| 摘要 |
PURPOSE:To make control function double by using the positive mode as well as the reverse mode of a control signal. CONSTITUTION:Remote instruction unit 3 is so constituted that positive-mode control signal A and reverse-mode control signal B can be transmitted selectively. When the positive-mode control signal is received by receiving unit 4, the output of decision circuit 10 becomes DC voltage V1 of reference level V0 or less, and contacts of switching circuit 6 and 9 are connected to 6a and 9a respectively, and a prescribed control signal from decoder 8 is supplied to channel selection control circuit 15. When the reverse-mode control signal is received, the output of decision circuit 10 becomes DC voltage V2 of reference level V0 or more, and contacts of switching circuits 6 and 9 are connected to 6b and 9b respectively. In this case, the control signal supplied to the input side of decoder 8 is inverted by inverter circuit 7, and the same control signal as the positive-mode control signal is supplied to control another channel selection control circuit 17. |
