PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010
Page 2-5
Rev. 29, Sept. 2021
2.2.4.2
Pass 1 / Expansion (P/N 11606)
– J3, pin 22 configuration (S2)
Switch
S3
1
ON
Pass 1 mic input
OFF
P/N 11606
Expan-
sion audio input
2
OFF
ON
2.2.4.3
Pass 2 / Expansion (P/N 11606) - J3, pin 23 configuration (S3)
Switch
S3
3
ON
Pass 2 mic input
OFF
P/N 11606 Expan-
sion audio output
4
OFF
ON
2.2.4.4
CVR
– J3, pin 2 configuration (S2
Cockpit Voice Recorder audio output connector pin 2
Switch
S2
1
ON
CVR Output
OFF
OPEN
2
OFF
ON
2.2.4.5
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
2.2.4.6
28-Volt Backlighting / Swap
– J3, pin U configuration (S4)
Switch
S4
3
ON
28 V lighting
control
OFF
Swap switch
4
OFF
ON
2.2.4.7
Backlight 14/28V
Switch
14 V
28V
1
On
Off
2
Off
On
3
Off
On
4
On
Off