Front Panel Controls - ASL INTERCOM PS 279 User Manual

6.0 FRONT PANEL CONTROLS AND CONNECTOR
1 POWER ON/OFF switch
Mains power push button for switching the internal
power supply ON and OFF.
2 OVERLOAD LED
This LED illuminates, when the internal circuit-breaker
shuts off line power due to overload. A cause for
overload can be a connection of too many user
stations, a short-circuit in the interconnecting cables,
or a thermal overload. The circuit-breaker resets
automatically 3 seconds after the cause of the
overload has been removed, and restores line power
automatically.
During short-circuit, the LED will flash every 3
seconds. During thermal overload it will be lit
continuously.
The LED will also come on for a few seconds every
time you switch on mains power.
3 POWER LED
This LED illuminates if line power is supplied by the
internal power supply.
4 SYSTEM LINK IN A
This LED illuminates if another ASL Intercom System
has been connected to the PS 279 through the
"System Link" connector of Channel A. The Line
Impedance is now provided by the other Intercom
system and the internal line impedance for Channel A
is switched off. The Buzzer mute function on Channel
A can now only be controlled by the connected
system, while the Buzzer Mute on Channel B will still
be controlled by the PS 279. The Mic Mute signals
given by the other Intercom system are also sent to
the user stations connected to Channel A of the PS
279. If a Mic Mute is given by the PS 279, it is only
send to its own channels and does not mute the
microphones of the other Intercom System.
5 SYSTEM LINK IN B
This LED illuminates if another ASL Intercom System
has been connected to the PS 279 through the
"System Link" connector of Channel B. The Line
Impedance is now provided by the other Intercom
system and the internal line impedance for Channel B
is switched off. The Buzzer mute function on Channel
B can now only be controlled by the connected
system, while the Buzzer Mute on Channel A will still
be controlled by the PS 279. The Mic Mute signals
given by the other Intercom system are also sent to
the user stations connected to Channel B of the PS
279. If a Mic Mute is given by the PS 279, it is only
send to its own channels and does not mute the
microphones of the other Intercom System.
6
6 BUZZER
This buzzer indicates an incoming or outgoing call. It is
activated by pressing a CALL button of the PS 279 or
a CALL button on any other station on channel A or B
for longer than two seconds, if the buzzers are not
muted (see 5.7). You can adjust its volume with the
buzzer volume control.
7 BUZZER VOLUME trimmer
This trimmer adjusts the volume of the buzzer.
8 ALL MIC'S ON/OFF button
With this pushbutton all microphones of the connected
stations can be switched off. Each user station can
activate its microphone again by pushing its TALK
button.
9 ALL BUZZERS ON/OFF button
With this button all buzzers of the connected stations
can be muted. The buzzers stay muted until the Mute
button is switched off again.
10 AUX VOLUME controls
These knobs adjust the level of the Aux input signal to
each of the two intercom lines.
11 A/B/HEADSET routing switches
These three switches route the aux input signal to
either:
1) Intercom channel A and/or Intercom channel B
2) Directly to the headset
If the aux is routed to the headset it is for local
monitoring only, and cannot be routed to the intercom
channels.
User manual PS 279 / Issue 1 © 2006 ASL Intercom, Utrecht, The Netherlands