| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of the core wires of a relay cable, to miniaturize the relay cable and to reduce the manufacturing cost. SOLUTION: In the case that the display device 33 of an operation box 34 performs display by 4-bit data, a main control part 24 respectively sends out the various kinds of signals for the display through signal lines L21-L28 to the display device 33. Also, in the case that the keyboard 32 of the operation box 34 is the matrix of 3×5 for an instance, the various kinds of output signals for the scanning of a key matrix are sent out by the signal lines L24-L28 and input signals are received by the signal lines L29-L31. A part of the signals for the display of the display device 33 and a part of the signals for key scanning utilize the five signal lines L24-L28 of the relay cable 35 in common.
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