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PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 2-5 Rev. 25, Feb. 2015
2.3.2.4 Pass 2 / Expansion - J3, pin 23 configuration (S3)
Switch
S3
3
ON
Pass 2 mic input
OFF
Expansion audio
output
4
OFF
ON
2.3.2.5 CVR / IRS Control – J3, pin 2 configuration (S2
PAC24 units can be equipped with an optional Intercom Recording System (IRS, P/N 0200, -0401), which
will store up to 60 seconds of radio traffic (on the transceiver selected for transmit). The playback control is
a normally open switch connected to ground, which triggers the stored audio.
Internal Recording System units are incompatible with the standard Cockpit Voice Recorder output
Switch
S2
1
ON
CVR Output
OFF
IRS Playback Input
2
OFF
ON
2.3.2.6 14-Volt Backlighting / Swap – J3, pin 18 configuration (S4)
The installer has the option of implementing PS Engineering’s patented “Swap” function, which allows the
pilot to switch between Com 1 and Com 2 with an external switch. The Swap command is controlled
through the unused backlight input, and selected by the internal DIP switch.
Switch
S4
1
ON
14 V lighting
control
OFF
Swap switch
2
OFF
ON
2.3.2.7 28-Volt Backlighting / Swap – J3, pin U configuration (S4)
Switch
S4
3
ON
28 V lighting
control
OFF
Swap switch
4
OFF
ON
2.3.2.8 Backlight 14/28V
Switch
14 V
28V
1
On
Off
2
Off
On
3
Off
On
4
On
Off
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