| 摘要 |
PROBLEM TO BE SOLVED: To reduce weight of cables, and to facilitate processing and installation. SOLUTION: On a branch unit 17, a circuit board 31 and board side connectors 32a-32d are provided, and the branch unit 17 is connected to a control panel, and the branch unit 17 to the branch unit 17, by plural vertical cables 18. The number of pins is varied every combination of connection for the board side connectors 32a-32d, connectors 33a and 33b for the vertical cables, and connectors 33c and 33d for the branch cables.
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