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SDM-300A Satellite Modem
2.3.2
Fault Connector and Pinouts (J7)
The fault connector provides Form C contact closures for fault reporting. The three Form C
summary fault contacts, ratings 1A maximum at 24 VDC, 0.5A at 120 VAC, are
Modulator, Demodulator, and Common Equipment.
The fault interface connection is a 9-pin subminiature female D connector (J7) located on
the rear panel of the modem. Screw locks are provided for mechanical security on the
mating connector. Refer to Table 2-3 for pinout information.
Refer to
fault, connect all the Form C contacts in parallel.
Rev. 4
Table 2-3. Fault Connector and Pinouts (J7)
Pin #
Signal Function
1
Common equipment is not faulted
2
3
Common equipment is faulted
4
Modulator is not faulted
5
6
Modulator is faulted
7
Demodulator is not faulted
8
9
Demodulator is faulted
Note: A connection between the common (COM) and normally open (NO)
contacts indicates no fault.
Chapter 5
for a discussion of monitored faults. To obtain a system summary
Name
NO
COM
NC
NO
COM
NC
NO
COM
NC
Installation
2–7
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