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3
RECEIVER I/O CONNECTIONS
3
Receiver I/O Connections
3.1 25 Pin Connector
The D-shell 25 pin connector is the main interface to the receiver. The pin
connections are described in table 3.
Function
dc Power
Channel Select
RS232 Data
600 Ω Line
150 Ω / Hybrid
Discriminator
Direct Audio Output
Audio Ground
Sub-Audible Audio
Out
Carrier Operated Sw
Carrier Operated Sw
External Squelch
Table 3: Pin connections and explanations for the main, 25-pin,
D-shell Connector
RF Technology R220
Signal
Pins
Specification
+12
1, 14
+11.4 to 16 Vdc
Vdc
13, 25
-12
Vdc
1
21
BCD Coded
2
9
0 = Open Circuit
4
22
or 0 Vdc
8
10
10
23
1 = +25 to +16 Vdc
20
11
40
24
80
12
In
15
Test and Programming use
Out
2
9600, 8 data 2 stop bits
In
20
Transformer Isolated
Out
6
Balanced 0dBm Output
7
19
18
AC coupled, unsquelched
17
Direct AC Coupled Audio
5
Direct Audio Ground
4
Unsquelched, 1-250 Hz
+
3
Opto-coupled Transistor
-
16
Switch (10mA)
Input
8
<1 Vdc to Squelch
>2 Vdc or open ckt to
unsquelch
3.1 25 Pin Connector
Page 11
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