| 摘要 |
PURPOSE:To detect the falling of a connection terminal by connecting the final output signal line of a peripheral driving board to the input port of a main control board. CONSTITUTION:In a circuit connecting the main control board to plural peripheral driving boards 2 to 4 in series, the final output signal line of the board 4 is connected to the input port 12 of the board 1. Namely a serial communication data output signal outputted from the board 1 is compared with the final serial communication data signal. Thereby, whether each connection terminal falls off or not can be judged in accordance with the discrepancy/coincidence between the output signal and the input signal. Since the judged result is displayed at the occurrence of a trouble, the service and maintenance of this system can be improved. |
