FLEXCOMM 2000
(P-2000/C-2000/RT-2000)
Installation Manual
Page 46 of 56 Publication No. 150-049106
P-2000 Installation Manual Rev. F
Nov 2007
16 - 28 Vdc Panel Lite
This pin provides for 28 Vdc aircraft lite dimmer buss control of the keyboard lighting (the LCD
brightness is set by the user via keypad input). This pin does not draw power from the buss but
simply monitors the voltage for proper lite tracking. Either 28 V or 5 volt (pin 17) may be used but
not at the same time. This function is not used on the RT-2000 so no connection is required.
17 - 5 Vdc/5 VRMS Panel lite
This pin provides for 5 Vdc or 5 VRMS aircraft lite dimmer buss control of the keyboard lighting
(the LCD brightness is set by the user via keypad input). This pin does not draw power from the
buss but simply monitors the voltage for proper lite tracking. Either 28 V or 5 volt may be used
but not at the same time. This function is not used on the RT-2000 so no connection is required.
18 - Reserved Spare #2
This pin reserved for future use.
19 - 28 Vdc Aircraft Power
This pin provides 28 Vdc aircraft power to the unit. Loading requirements and proper circuit
breaker choices are P-2000/C-2000/RT-2000: 5 amps.
20 - 28 Vdc Aircraft Ground
This pin provides the ground return for the 28 Vdc aircraft power to the unit.
21 - PTT 2 Input
This input when grounded activates the transmitter for FM - 2. Normally this is connected to the
audio panel PTT output. If a discreet microphone is being used (no audio panel) this pin should
be tied to Mic 2 Input L.
22 - Reserved Spare #3
This pin reserved for future use.
23 - Mic 2 Input H
This pin is the high side of a differential microphone 2 input and provides a 150 ohm input
impedance for the crew microphone input. Normally this pin is connected to the audio panel.
Carbon microphone DC bias is provided by the unit. Standard input of 1kHz tone @ .25Vrms
should produce standard FM modulation out (3.0 kHz). Use shielded wire.
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