Page 4-4
GDR 66 Installation Manual
Revision A
190-00303-24
4.2 Power Functions
4.2.1 Aircraft Power
The GDR 66 provides two aircraft power bus inputs. Pins 28, 30, and 32 of P662 are internally connected
to form AIRCRAFT POWER 1. Pins 34, 36, and 38 of P662 are internally connected to form AIRCRAFT
POWER 2. AIRCRAFT POWER 1 and AIRCRAFT POWER 2 are “diode ORed” to provide power
redundancy. Use of three AIRCRAFT POWER pins (either AIRCRAFT POWER 1 or AIRCRAFT
POWER 2) and three POWER GROUND pins is recommended for all installations.
4.2.2 Remote Power Off
The GDR 66 powers down when the COM REMOTE POWER OFF input is active. COM REMOTE
POWER OFF is a non-configurable discrete input conforming to:
Low: 0 VDC < Vin < 3.5 VDC, OR Rin > 100k ohms (inactive)
High: 8 VDC < Vin < 36 VDC (active)
4.2.3 GDR System ID Program
The GDR 66 determines it’s unit number based on the status of three GDR SYSTEM ID PROGRAM*
non-configurable discrete inputs conforming to:
Low: 0 VDC < Vin < 3.5 VDC, OR Rin < 375 ohms (active)
High: 8 VDC < Vin < 36 VDC, OR Rin > 100k ohm (inactive)
Table 4-3 Aircraft Power
Pin Name
Connector
Pin
I/O
AIRCRAFT POWER 1
P662
28
In
AIRCRAFT POWER 1
P662
30
In
AIRCRAFT POWER 1
P662
32
In
AIRCRAFT POWER 2
P662
34
In
AIRCRAFT POWER 2
P662
36
In
AIRCRAFT POWER 2
P662
38
In
POWER GROUND
P662
1
--
POWER GROUND
P662
24
--
POWER GROUND
P662
26
--
POWER GROUND
P662
40
--
POWER GROUND
P662
42
--
POWER GROUND
P662
43
--
Table 4-4 Remote Power Off
Pin Name
Connector
Pin
I/O
COM REMOTE POWER OFF
P661
16
In
Table 4-5 System ID Program
Pin Name
Connector
Pin
I/O
GDR SYSTEM ID PROGRAM* 1
P661
20
In
GDR SYSTEM ID PROGRAM* 2
P661
22
In
GDR SYSTEM ID PROGRAM* 3
P661
24
In
DRAFT
