| 摘要 |
Satisfactory failure determination and detection of the connection state are made possible in a terminal control system comprising a main control device, a terminal device controlled by the main control device, and a communication line connected so as to enable two-way communication between the devices. The terminal control system comprises a main control device 1, a terminal device 2 controlled by the main control device 1, and a communication line 3 connected so as to enable two-way communication between the devices, wherein the main control device 1 comprises a detection unit 4 for detecting a characteristic of a waveform of terminal data transmitted from the terminal device 2 and received by the main control device 1 via the communication line 3, and also comprises a determination unit 5 for determining a state of a connection between the main control device 1 and the terminal device 2 based on results of detection by the detection unit 4 and on a reference stored by the main control device 1.
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