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”
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