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GDR-XXXX NAV/COM INSTALLATION MANUAL
CHAPTER 2 – SYSTEM INSTALLATION
64-000109
Page 34 of 62
19. SIGNAL DESCRIPTION
Use of the following signals will be determined by the avionics and audio panel interface.
A. Power and Ground
In receive mode, maximum current draw is 1.0 A. When one COM channel is
transmitting, maximum current draw is 8.0 A.
Conn
Pin
Description
P1
1
POWER (+28VDC)
P2
1
POWER (+28VDC)
P1
9
GROUND
P2
2
GROUND
B. RS-232 Interface
The GDR contains two RS-232 communications ports. Both ports can be
connected to an EFIS or Radio Management Unit to set frequencies, volumes, and
other modes of the COM, NAV, and MB. The GDR will use the last valid data from
any tuning port. The data used on these ports is proprietary and is intended to be
used by Genesys equipment.
Conn
Pin
Description
P2
3
RS-232 #1 GND
P2
4
RS-232 #1 RX
P2
5
RS-232 #1 TX
P2
26
RS-232 #2 RX
P2
34
RS-232 #2 TX
P2
37
RS-232 #2 GND
C. ARINC 429 Interface
The GDR contains two ARINC 429 receive ports and one ARINC 429 transmit
port. Either ARINC429 receive port may be used to control the VHF, UHF, NAV,
and MB receivers. The GDR will use the last valid data from either port. Burst
mode operation is recommended, which will allow a combination of RS-232 and
ARINC tuning when required.
Conn
Pin
Description
P2
15
ARINC 429 RX#1 A
P2
16
ARINC 429 RX#1 B
P2
17
ARINC 429 RX#2 A
P2
18
ARINC 429 RX#2 B
P2
21
ARINC 429 TX A
P2
22
ARINC 429 TX B
The ARINC 429 transmit port is used to send COM, VOR/LOC, GS, and MB data
and/or status. The following ARINC 429 labels are accepted and/or transmitted by
the GDR. Please refer to APPENDIX A – ARINC 429 SPECIFICATIONS for bit
definition and other details on each ARINC 429 label.
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