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PAGE 5
User manual PS 155 / Issue 2011 © ASL Intercom BV
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6.0
REAR PANEL CONNECTORS
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12
LINE connectors
These male and female XLR-3 connectors are for
connecting the PS 155 to the intercom party line.
Pin assignments:
Pin 1: 0 V / ground shield
Pin 2: +30 V power wire
Pin 3: audio wire
13
TO TRANSCEIVER connector
This Sub-D 9 pole connector is for connecting the
PS 155 to the wireless unit. The connector is also
used to connect an external PTT switch to the PS
155.
For pin assignment and further details, see
section 8.0.
7.0
RECEIVE AND TRANSMIT MODE
If the internal Transmit Switch of the PS 155 is
triggered, the wireless unit connected to the PS
155 (see section 8.0)
JRHVIURPµUHFHLYHPRGH¶WR
µWUDQVPLWPRGH¶
The Rx/Tx LED (#11) goes from
being lit green to being lit red. The Transmit
Switch can be triggered in three different ways, to
be selected by a 3-position switch in the TX
CONTROL section of the PS 155 front panel.
These switch positions are:
µ
CALL
¶
Transmit mode is enabled by pushing any CALL
button at the wired intercom stations. Detect of
this Call signal triggers the Transmit Switch.
When this option is selected, the buzzers of all
user stations connected to the party line are
automatically disabled.
The Call Detect level can be adjusted by internal
trimmer R29, see section 11.0.
µ
VOX
¶
Transmit mode is enabled by detecting audio on
the intercom party line. As soon as this audio
signal exceeds an adjustable threshold, the
Transmit Switch is triggered. The VOX has a
special frequency contouring circuit which is
optimized for the human voice.
The attack (threshold) level and the release time
can be adjusted at the front panel.
The attack time can be adjusted by internal
trimmer R9, see section 11.0.
µ
PTT
¶
(Push To Talk)
Transmit mode is enabled by pushing an external
button, to be connected to the PS 155.
This push button should be momentary only.
See also section 8.0
