Equipment Installation Manual,
GDC31 Roll Steering Converter
CONNECTOR PIN OUT:
The GDC31 contains a single 25-pin male connector, J1, per MIL-C-24308. The mating connector, P1, is
described previously under the section “Equipment Supplied”.
Pin Signal Function
1 A+ 28 Vdc Primary Power
2 Serial Out RS232 Output
3 Serial In RS232 Input
4 Reserved (VPP)
5 AP-OUT Autopilot Output
6 AP-REF2 Autopilot Reference, 10.6Vac max (1)
7 TX-A ARINC 429 Transmit A
8 TX-B ARINC 429 Transmit B
9 BAUDSEL1 Serial Baud Rate Select 1
10 GAINSEL1 Autopilot Gain Select 1
11 Prog Pin Common Program Pin Common
12 GPS Lamp A GPS Mode Annun Relay Armature
13 Phase Select Phase select program pin
14 Power Common 28 Vdc Return
15 AP-COM Autopilot Common (ground)
16 Serial Common RS232 Common
17 Reserved (/PGM Enable)
18 AP-REF1 Autopilot Reference, 30Vac max (1)
19 AP-OFFSET Autopilot Offset Input (A/P Common) +6Vdc max
20 429 Shield ARINC 429 Shield Common
21 BAUDSEL0 Serial Baud Rate Select 0
22 GAINSEL0 Autopilot Gain Select 0
23 TYPESEL0 Rate Based Select
24 GPS Lamp B GPS Mode Annun Relay N.O. Contact
25 Super Flag In 14 / 28 Vdc valid flag from GPS
Table 6
J1 Pin Description
NOTES: Do not use pins labeled Reserved. These are for factory test and In-Circuit-Programming
(1) Connect only one reference. Refer to “Reference Inputs” section.
1049-2510-01 G.doc
1049-2510-01
Rev G Page 25 of 47
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