Barrett 2050 - Page 279

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Auxiliary connector (25 pin female "D" connector on rear panel)
Note 1:- Pin 18 and Pin 19 – Function depends on programming:- If Linear
Amplifier selected in I/O configuration these lines are programmed to control the
linear LPF selection of 2075 linear amplifiers. Otherwise Pin 18 becomes the Selcall
alarm output pin and pin 19 follows the audio mute condition.
Note 2:- Balanced Rx audio out on Pin 25 and Pin 12 can be un-muted or follow the
audio mute depending on the configuration in the protected menu “I/O section”.
Pin
Name
Description of function
Level
1
Ground
Ground
0 V
2
Rx Data
RS-232 data input
True RS-232
3
Tx Data
RS-232 data output
True RS-232
4
External Power On
For use with ancillary equipment.
Low to activate
5
External Speaker
External speaker output
0-10 V
6
Aux dig in 0
Future use
Active low 0 V
7
RS-232 Gnd
RS-232 Ground
0 V
8
ALC In
Ext. ALC from Linear Amp
0-10 V
9
PTT In
Auxiliary PTT input
Active low 0 V
10
Aux dig in 1
Scan stop input from external modem
Active low 0 V
11
Bal. Tx Audio In
Balanced Tx audio input (with pin 24)
600 Ω -24 dBm to 0 dBm
12
Bal. Rx Audio Out
Balanced Rx audio output (with pin 25)
600 Ω -6 dBm to +9 dBm
13
Ground
Ground
0 V
14
Aux dig out 0
Linear LPF select
Active low 0 V
15
Aux dig out 1
Linear LPF select
Active low 0 V
16
Aux dig out 2
Linear LPF select
Active low 0 V
17
Aux dig out 3
Linear LPF select
Active low 0 V
18
Aux dig out 4
Linear LPF select /Selcall alarm
Active low 0 V
19
Aux dig out 5
Linear LPF select /Audio mute
Active low 0 V
20
Aux dig in 2
Future use
Active low 0 V
21
PTT / C-Mute
PTT Out / Receiver Cross Mute
Active low 0 V
22
Not Used
Not Used
23
+13.8 V Fused Out
+13.8 V Output to power auxiliary equipment
13.8 V @ 2 Amp.
24
Bal. Tx Audio In
Balanced Tx audio input (with pin 11)
600 Ω -24 dBm to 0 dBm
25
Bal. Rx Audio Out
Balanced Rx audio output (with pin 12)
600 Ω -6 dBm to +9 dBm