Comtech EF Data SDM-2020 - Manual (Page 45)

SDM-2020 Satellite Demodulator Revision 4
Installation MN/SDM2020D.IOM
3–5
3.2.2 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 3-3 provides the pinout of the J2 connector.
Table 3-3. 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.