Alarms' Interface Connector (Db-15M); Table 3-4. 'Alarms' Connector Pinouts - Comtec CDM-840 Installation And Operation Manual

CDM-840 Remote Router
Rear Panel Connections
3.2.3.4

'ALARMS' Interface Connector (DB-15M)

Pin 2 of this connector provides an analog signal to aid antenna pointing or for
driving step-track equipment. The analog signal will be zero volts when the unit is
not locked to a carrier. When locked to a carrier the analog signal will be 1 volt for
Es/No values less than or equal to -4.69 dB, or 10 volts for Es/No values greater than
or equal to 20dB as depicted in the following chart:
Connector Type
Type 'D' 15-pin male

Table 3-4. 'ALARMS' Connector Pinouts

PIN # SIGNAL FUNCTION
1 GROUND
9 EXT CARRIER OFF
2 ES/NO VOLTAGE (0 TO 10 VOLTS)
10 RESERVED +3.3V INPUT CMOS LEVEL
3 NO CONNECTION
11 NO CONNECTION
4 UNIT FAULT
12 UNIT FAULT (ENERGIZED, NO FAULT)
5 UNIT FAULT (DE-ENERGIZED, FAULTED)
13 TX TRAFFIC
6 TX TRAFFIC (ENERGIZED, NO FAULT)
14 TX TRAFFIC (DE-ENERGIZED, FAULTED)
7 RX TRAFFIC
15 RX TRAFFIC (ENERGIZED, NO FAULT)
8 RX TRAFFIC (DE-ENERGIZED, FAULTED)
3–10
Name
ALARMS
MN-CDM840
Revision 3
Description
In/Out
NAME
GND
EXT-OFF
ES/NO
N/C
N/C
N/C
UNIT-COM
UNIT-NO
UNIT-NC
TX-COM
TX-NO
TX-NC
RX-COM
RX-NO
RX-NC