Comtech EF Data MM200 - Manual (Page 78)

Electrical Interfaces MM200 High-Speed Microwave Modem
5-2 TM086 - Rev. 4.1
Refer to Table 5-1 below for pinouts for optional DC Power plug.
Table 5-1. DC Power
A - DC Input
B Ground
C + DC Input
5.2 Alarm Port
The Alarm Connector (J1) is used to indicate the fault condition of the modulator to external
equipment. This male 9-Pin D-Sub Connector provides connection to two form-c relays and an
open collector output for mod and demod. The user can distinguish between modulator and
demodulator alarms with the relays. All minor alarms are ignored. A major or common fault will
activate the alarm. Refer to Table 5-2 for connector pinouts. Table 5-3 below describes the alarm
indications.
Table 5-2. Alarm Connector J6 Pin Assignment
Pin No. Connection
1 Mod (Open Collector)
2 Mod (Normally Closed)
3 Demod (Open Collector)
4 Demod (Normally Closed)
5 Ground
6 Mod C
7 Mod (Normally Open)
8 Demod C
9 Demod (Normally Open)
Table 5-3. Alarm Indications
Alarm Pin Description
None 6 – 7 shorted, 8 – 9 shorted
Mod 6 – 2 shorted, 5 – 1 driven high
Demod 8 – 4 shorted, 5 – 3 driven high