| 摘要 |
PROBLEM TO BE SOLVED: To automatically execute settings between channels and to prevent malfunctions by outputting signals of a plurality of channels, detecting that a line is connected to an output terminal and adding the signal of a channel whose connection is not detection means to the signal of a channel, which is outputted to the output means for detecting that the line has been connected. SOLUTION: A microcomputer 17 detects whether a load is connected to an output terminal with the voltage of contact points 24-29 and displays whether the load is connected or not in output terminals 18-23 on a display part 31. It displays non-connection channel or/and output terminals on the display unit 31 for a prescribed period. If load is not connected to the output terminal 20 of an SL signal or the output terminal of an SR signal and a channel signal is in a non-output state, the microcomputer 17 discriminates from the voltage of contact points 26 and 27, adds the SL and SR signals to FT and FR signals, and they are outputted. Thus, switches 10 and 11 are turned on, and the SL and SR signals are outputted to adders 14a and 14b. |
