PS Engineering Inc. ®
PAR100EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-760-0000
Page 2-7
Rev. 11, Feb. 2013
2.6.2
Telephone sidetone
The PAR1000EX will provide cell phone sidetone (your side of the telephone conversation) in the factory
configuration. Some telephones do provide sidetone the PAR100EX can be configured to remove this side-
tone by placing the DIP switch in the proper configuration.
Cell phone sidetone created by
audio panel
OFF
J5 Switch 6
No cell phone sidetone
ON
Table 2-3 Telephone sidetone switch
2.6.3
"Swap" Mode
When a momentary, normally open, push-button switch is connected between pin 20 on the J2 connector
and aircraft ground, the user can switch between Com 1 and 2 by depressing this switch without having to
turn the mic selector switch. This yoke-mounted switch eliminates the need to remove your hands from
the yoke to change transceivers.
2.6.4
Backlighting
The PAR100EX has an automatic dimming of the pushbutton annunciation LEDs controlled by a photo-
cell. Control of the unit backlighting is through the aircraft avionics dimmer. For 12-Volt aircraft, connect
J2 Pins 6 and 7 to the aircraft dimmer bus, and pin 5 to ground.
As shipped from PS Engineering, the PAR100EX is
ONLY
compatible with 12 Volt DC systems. Contact
PS Engineering at 1.865.988.9800 or
if 24V operation is desired. For 24-
volt backlighting systems, connect pin 7 to the aircraft dimmer, and pins 5 and 6 to ground.
NOTE:
If the PAR100EX/M760REM is installed in 28V aircraft without properly configuring the unit,
the M760REM radio will be damaged. See § 2.9
The LCD display backlighting is controlled by the automatic photocell dimming. In addition, the text in-
verts for nighttime mode when the ambient light is low.
If an external dimmer control is
not
used, a constant back light illumination can be established for night-
time viewing. Pin 6 or 7 (depending on system voltage) must be tied to power (J2, pin 8 or 9) for the back
lighting system to work. The photocell mounted in the unit face will automatically adjust the intensity of
the push-button annunciation LEDs.
2.6.5
Unswitched inputs
J1, pins 31, 29 and J2 pin 15 are unswitched, unmuted (by transmitter keying), inputs # 1, 3 and 4, re-
spectively. These inputs are presented to the pilot and copilot regardless of the audio configuration, and
will mute the entertainment inputs based on the mode. These 510 Ω inputs can be used for altimeter DH
audio, GPS waypoint audio, autopilot disconnect tones, or any other critical audio signal. Unswitched #1
is always presented to the crew headphones, and is available to the pilot in fail-safe (off) mode.
Unswitched 3 and 4 inputs are always presented to the crew headphones.
Unswitched
Input
Hear in
Fail Safe
Hear in
Crew Headset
Gain
1
Yes
Yes
1:1(fixed)
2
No
Yes
1:1(fixed)
3
No
Yes
Adjustable
4
No
Yes
1:1(fixed)
Table 2-4 Unswitched input table
