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Power
Supply
Connections shown for:
5902 Bell 202 Modem Hardware Manual
October 19, 2007
5902 Termination Block
Tx/Rx
Rx
+
–
+
–
1
2
3
4
+
10.8 Volts
–
1
2
3
6
7
8
Figure 10: Typical Connection to Maxon Radio
5902 Termination Block
Tx/Rx
Rx
KEY
+
–
+
–
+
1
2
3
4
5
+
–
5
8
10
6
Johnson models 3410/3490
10 pin connector
Figure 11: Typical Connection to Johnson Radio
5902 Termination Block
Tx/Rx
+
--- -
+
1
2
3
+
Power
Supply
--- -
6
7
8
Carrier detect active high
Motorola RNet Series
PTT active low
Telemetry Radio
Channel 1 enabled
15 pin D-connector
Squelch enabled
Figure 12: Typical Connection to Motorola Radio
KEY
RCD
+
–
+
–
5
6
7
8
Maxon D Connector
1. data in
2. data out
3. PTT
4. GND
5. Vcc
4
5
6. CDS
7. no connection
9
8. no connection
9. no connection
RCD
–
+
–
6
7
8
Johnson Connector Pins
1. no connection
2. no connection
3. no connection
4. no connection
5. B+
6. Keyline (active low)
7
9
7. Carrier Detect (active high)
8. Data In
9. Ground
10. Data out
Rx
KEY
RCD
--- -
+
--- -
+
--- -
4
5
6
7
8
Motorola Connector Pins
1. Not Used
2. Not Used
3. Not Used
4. Mic Audio Input
5. Channel Select
6. B+
7. Data Input
8. Data Output
9. Not Used
14
13
15
10. Not Used
11. Squelch Disable
12. Audio Output
13. Carrier Detect
14. PTT
15. Ground
17
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