| 摘要 |
PROBLEM TO BE SOLVED: To provide a channel board of a transmitter for easily recognizing a use state of a line visually. SOLUTION: The channel board 1 includes a voltage relay 2 for detecting transmission signals transmitted to the line and a state display LED 3 for displaying a detected result by the voltage relay 2. By transmitting DC channel signals to a 4WR circuit 5 and operating the voltage relay 2, a switch 6 is turned on, the state display LED 3 is lighted and it is displayed that the line is in use. COPYRIGHT: (C)2009,JPO&INPIT
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