SDM-2020 Satellite Demodulator
Installation
Rev. 3
2–9
2.3.3
Fault Connector (J2)
The fault interface connection is a 9-pin female D connector located on the rear panel of the
demodulator. Screw locks are provided for mechanical security on the mating connector.
The fault connector provides FORM-C contact closures for fault reporting. The two
FORM-C summary fault contacts are Demodulator and Common Equipment. To obtain a
system summary fault, connect all of the FORM-C contacts in parallel.
Table 2-3 provides the pinout of the J2 connector. This table also shows which pins are
connected, when a fault or alarm condition occurs. It also states which pins are
connected when power to the unit is off.
Table 2-3. Faults Status Relays Connector Pinout (J2)
Pins Connected
Signal Function
Name
Pin #
Type
Fault/
Alarm
OK
Power
OFF
Common Equipment Fault
CE_NO
CE_COM
CE_NC
1
2
3
FC
FC
FC
2-3
1-2
2-3
Demodulator Fault
DEM_NO
DEM_COM
DEM_NC
4
5
6
FC
FC
FC
5-6
4-5
5-6
Demodulator Alarm
ALM_NO
ALM _COM
ALM _NC
7
8
9
FC
FC
FC
7-8
8-9
8-9
Note:
A connection between the common (COM) and normally open (NO) contacts indicates no
fault.
Summary of Contents for SDM-2020
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