ASL INTERCOM BS 217 User Manual page 8

6 TALK buttons + LEDs channel A & B
These buttons allow the user to talk to each channel separately or to both channels
simultaneously. The large green LED's indicate if the talk function is activated.
7 CALL buttons + LEDs channel A & B
A Call button activates the Call system.
By a momentary push a Call signal is sent to all stations connected to the referring
intercom channel. The Call LED on this station and on all to the channel connected
stations starts flashing. Pushing and holding a Call button for 2 seconds activates
the call buzzer in all stations. After the CALL button is released the Call LED's con-
tinue to flash for a further 2 seconds.
8 AUX VOLUME controls A & B
To adjust the level of the Aux input signal to each of the two intercom lines.
9 MIC GAIN trimmer
To adjust the input gain of the headset microphone signal.
10 HEADSET connector
A XLR-4 connector to connect a headset.
The can impedance must be minimum 200 ohms. The headset microphone may
be of the dynamic or electret type.
Pin assignments:
Pin 1: shield mic. (GND)
Pin 2: mic. +
Pin 3: phones +
Pin 4: phones –
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