4.0
MECHANICAL INSTALLATION
For the BS 217 a vertical rack space of 1RU
(1.75”, 44mm) is required. It is not necessary to
provide rear support by extra bracing or
shelving. Adequate ventilation must be
provided by allowing sufficient space around
the sides and rear of the unit to ensure free
circulation of air.
Forced cooling is not required.
The power supply regulator is mounted on the
rear of the unit; after a period of time it will feel
hot to the touch. This is quite normal, and
should be no cause for alarm.
5.0
FRONT PANEL CONTROLS & CONNECTOR
1
POWER ON/OFF push button
To switch mains power on or off
2
MAINS POWER LED
This LED illuminates if line power is supplied by
the internal power supply.
3
BUZZER VOLUME trimmer
To adjust the volume of the internal buzzer.
The buzzer indicates an incoming or outgoing
call. It is activated by pushing a CALL button on
this station or a CALL button on any other
station for longer than two seconds. .
4
VOLUME knobs for channel A & B
To adjust the listen level for the headset. Each
channel may be adjusted separately.
5
SIDE TONE trimmers (channel A & B)
To adjust the level of one’s voice as heard in
one’s headset.
Adjustment procedure (for each channel
separately):
•
set the trimmer in start position: fully
clockwise
•
switch off the microphones of all connected
stations
•
push the TALK button of the channel
•
turn up the volume of the channel
•
speak into the headset microphone
•
adjust the listen level by turning the side
tone trimmer of the channel.
The trimmer operating area is between fully
clockwise and minimum level.
6
TALK b LEDs, channel A & B
These buttons allows the user to talk to each
channel separately or to both channels
simultaneously. The large green LED’s indicate
whether the talk function is activated.
7
CALL b LEDs, channel A & B
To activate 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 continue 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 (XLR-4)
To connect a headset to the BS 217.
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:
Pin 4: phones –
