| 摘要 |
PROBLEM TO BE SOLVED: To provide an information transmitter that can recognize that a power supply of a 1st device or a 2nd device is turned off when a connection cable interconnects the 1st and 2nd devices. SOLUTION: Power supply interlocking switches 121, 122, 123, 124 are provided among connection cable insertion detection ports SEL1, SEL2 and grounds 131, 132, 133, 134 in a master station device 2 and slave station devices 3, 4 that are interconnected by connection cables 44, 45.
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