B. RF connector
The unit RF connector is of the TNC female type. The antenna cable shall be
of low-loss 50 W cable, at least RG 58C/U or better RG 223/U type.
Pin Name Pin Description Source Destination Recommended
cable type
Antenna
50 W TNC antenna con
-
nector, female
bi-directional to the
antenna
bi-directional to the
antenna
RG58C/U or
RG223/U
C. Pin connections of the unit connector P9
The unit connector type is D-SUB 25-pins male.
Pin Pin Name Pin Description Source Destination Recommen
-
ded cable
type
1 A1 Altitude A1 Encoding altimeter
(parallel interface)
BXP6401-X-(XX) AWG24
2 A2 Altitude A2
or
Encoding altimeter
(parallel interface)
BXP6401-X-(XX) AWG24
GPS /Enable* Aircraft DC supply
ground*
AWG 26
3 A4 Altitude A4
Encoding altime-
ter (parallel inter-
face
)
BXP6401-X-(XX) AWG24
4 IDENT_N IDENT switch External IDENT but-
ton
BXP6401-X-(XX) AWG26
5 EXT. SUPPRES
-
SION
Aircraft suppression sy
-
stem
Bi-directional Bi-directional Coaxial ca
-
ble
6 SWITCHED PO
-
WER OUT
Switched supply volta
-
ge, Imax = 1 A
BXP6401-X-(XX) Encoding altime
-
ter
AWG20
7 REPLY OUT Output for external re
-
ply lamp, active LOW
BXP6401-X-(XX) Reply lamp AWG26
8 RX+ RS-422 GPS receiver** GPS receiver BXP6401-X-(XX) 2xAWG 26
9 RX- shielded
10 Illumination A Illumination control Aircraft illumination
voltage
BXP6401-X-(XX) AWG24
11 SUPP Supply Aircraft DC supply BXP6401-X-(XX) AWG20
12 10 V to 33 V
13 GND DC supply ground, addi
-
tionally connected to
pin 25
Aircraft DC supply
ground
BXP6401-X-(XX) AWG20
14 B1 Altitude B1 Encoding altimeter BXP6401-X-(XX) 7xAWG24
15 B2 Altitude B2 (parallel interface)
16 B4 Altitude B4
17 C1 Altitude C1
18 C2 Altitude C2
19 C4 Altitude C4
20 D4 Altitude D4
21 Not connected — — — —
22
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INSTALLATION AND OPERATION BXP6401-X-(XX)