Aiphone RAX R24/A - Manual (Page 28)

Incorrect wiring can be detected by the trouble mode as shown below;
XII. Trouble Shooting Guide
Wiring mode
Terminals
OPEN SHORT
1 and 2 * No LED is lit.
* No dial tone.
* No communication.
* LED is lit. (cannot select)
* Dial tone is heard (can be called)
* No communication (cannot transmit
voice signal to the other station)
1 or 2 * LED is lit.
* Dial tone is heard.
* No communication (cannot transmit
voice signal to the other station)
3 and 4 * No LED is lit.
* No dial tone.
* No communication.
* LED is lit.
* No dial tone.
* No communication (can transmit voice
signal to the other station)
3or4 * LED is lit (can select, but cannot be
called).
* No dial tone.
* No communication (can transmit
voice signal to the other station)
1 and 3 * LED is lit.
* No dial tone.
* No communication (cannot transmit
voice signal to the other station)
2 and 4 * LED is lit.
* No dial tone.
* No communication (cannot transmit
voice signal to the other station).
1,2,3 and 4
1 and 3
1 and 4
2 and 3
2 and 4
* LED is lit while depressing a number
button, and goes out upon releasing.
* No dial tone.
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