Comtech EF Data SDM-9000 - Manual (Page 57)

SDM-9000 Satellite Modem Installation
Rev. 4 2–15
2.4.10 Alarms (J10)
The alarms connector is used to provide three Form C contact closures for alarm
reporting, as follows:
• Alarm 1 = Not used
• Alarm 2 = TX
• Alarm 3 = RX
The two Form C summary fault contacts currently used are:
•
Transmit alarm (Alarm 2)
• Receive alarm (Alarm 3)
Refer to Chapter 4 for a discussion of alarms monitored. To obtain a system summary
alarm, connect all the Form C contacts in parallel.
The alarms connection is a 9-pin female D connector located on the rear panel of the
modem. Screw locks are provided for mechanical security on the mating connector.
Signal Function Name Pin #
Alarm 1 is OK NO 1
Common COM 2
Alarm 1 is faulted NC 3
Alarm 2 is OK NO 4
Common COM 5
Alarm 2 is faulted NC 6
Alarm 3 is OK NO 7
Common COM 8
Alarm 3 is faulted NC 9
Note: A connection between the common (COM) and normally open (NO) contacts
indicates no alarm.