| 摘要 |
PROBLEM TO BE SOLVED: To make easily replaceable an equipment which is connected in daisy chain. SOLUTION: When 1st and 2nd connection terminals 21 and 22, an interface part 11 which is connected between both the connection terminals and which performs an interface process between data inputted or outputted through the connection terminals and, an internal circuit are provided a buffer amplifier part 24 is provided between the 1st and 2nd connection terminals 12 and 22 and interface part 11 and when the interface part 11 and buffer amplifier part 24 are disconnected from each other, the power supply to the buffer amplifier part 24 is stopped.
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