PAGE 5
User Manual PS 279 / October 2013 © ASL Intercom BV
4.0 MECHANICAL INSTALLATION
A vertical rack space of 1U (1.75” / 44,5 mm) is
required for the PS 279. 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
nit to ensure free circulation of air.
Forced cooling is not required.
The power supply is mounted on the bottom of the
PS 279. After a period of time it will feel hot to the
touch on top and bottom. This is normal and
should be no cause for alarm.
5.0 FRONT PANEL CONTROLS AND CONNECTOR
1 OVERLOAD LED
This LED illuminates if the circuit breaker shuts off
line power due to overload. A cause for overload
can be too many user stations connected or a
short circuit in the interconnecting cables.
The circuit breaker resets automatically 3
seconds after the cause of the overload has been
removed and restores the line power.
During short circuit, the LED flashes every 3
seconds. Every time mains power is switched on,
the LED is lit for a few seconds.
2 POWER LED
This LED illuminates if line power is supplied by
the internal power supply.
3 SYSTEM LINK LED / CHANNEL A
This LED illuminates if a channel of another ASL
Intercom System has been connected to channel
A of the PS 279, through its “System Link”
connector. The Line Impedance is now provided
by the other Intercom system and the internal line
impedance for Channel A is switched off.
A Mic Mute signal sent from the other intercom
system is also received by the user stations on
Channel A. But a Mic Mute signal sent from the
PS 279 is only received by the user stations on its
own channels (it does not mute the microphones
of the user stations of the other system).
Buzzer Mute signals are not going from the other
intercom system to the PS 279, nor in the
opposite direction.
See #8 for “Mic Mute” and #9 for “Buzzer Mute”.
4 SYSTEM LINK LED / CHANNEL B
Same as #3, but for channel B.
5 POWER ON/OFF switch
To switch the internal power supply ON and OFF.
6 BUZZER VOLUME trimmer
To adjust the buzzer volume.
7 BUZZER
Indicates an incoming or outgoing call. It is
activated by pushing 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, provided the
buzzers are not muted (see #9). The buzzer
volume may be adjusted with the buzzer volume
control (see #6).
8 ALL MIC’S ON/OFF button
With this push button 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 push button all buzzers of the connected
user stations can be muted. The buzzers remain
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 signal to
either (1) Intercom channel A and/or Intercom
channel B or (2) directly to the headset and not
to the intercom channels.
12 VOLUME control knobs
To adjust the listen level of the headset, for each
channel separately
(11 stránky)
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