Operating instructions

RF Technology R350/R500 Page 9
4 FREQUENCY PROGRAMMING
Function Signal Pins Specification
DC Power +12 Vdc
0 Vdc
1, 14
13, 25
+11.4 to 16 Vdc
Ground
Channel Select 1
2
4
8
10
20
40
80
21
9
22
10
23
11
24
12
BCD Coded
0 = Open Circuit
or 0 Vdc
Logic1 = +5 to +16 Vdc
RS232 Data In
Out
15
2
Test and Programming use
9600, 8 data 2 stop bits
600Ω Line Output
Line-
Line+
20
6
Transformer Isolated
Balanced 0dBm Output
150Ω / Hybrid
7
19
Discriminator Audio 18 AC coupled, unsquelched
Direct Audio Output 17 Direct AC Coupled Audio
Audio Ground 5 Direct Audio Ground
Sub-Audible Audio
Out
4 Unsquelched, 1-250 Hz
Carrier Operated Sw
Carrier Operated Sw
COS+
COS-
3
16
Opto-coupled Transistor
Switch (10mA 30V max)
External Squelch Input 8 <1 Vdc to Squelch
>2 Vdc or open circuit to
unsquelch
Table 3: Pin connections and explanations for the main, 25-pin,
D-shell Connector