46
Auxiliary connector
(25 pin female "D" connector on rear panel)
Pin
Name
Description of function
Level
1 Ground
Ground
0V
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
0-10V
6
Aux dig in 0
Future use
Active low 0V
7
RS-232 Gnd
RS-232 Ground
0V
8
ALC In
Ext. ALC from Linear Amp
0-10V
9
PTT In
Auxiliary PTT input
Active low 0V
10
Aux dig in 1
Scan stop input from external modem
Active low 0V
11
Bal. Tx Audio In
Balanced Tx audio input (with pin 24)
600
Ω
-24dBm to 0dBm
12
Bal. Rx Audio Out
Balanced Rx audio output (with pin 25)
600
Ω
-6dBm to +9dBm
13 Ground
Ground
0V
14
Aux dig out 0
Linear LPF select
Active low 0V
15
Aux dig out 1
Linear LPF select
Active low 0V
16
Aux dig out 2
Linear LPF select
Active low 0V
17
Aux dig out 3
Linear LPF select
Active low 0V
18
Aux dig out 4
Linear LPF select /Selcall alarm
Active low 0V
19
Aux dig out 5
Linear LPF select /Audio mute
Active low 0V
20
Aux dig in 2
Future use
Active low 0V
21
PTT / C-Mute
PTT Out / Receiver Cross Mute
Active low 0V
22
Not Used
Not Used
23
+13.8 V Fused Out
+13.8V Output to power auxiliary
equipment
13.8V @ 2 Amp.
24
Bal. Tx Audio In
Balanced Tx audio input (with pin 11)
600
Ω
-24dBm to 0dBm
25
Bal. Rx Audio Out
Balanced Rx audio output (with pin 12)
600
Ω
-6dBm to +9dBm
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”
