Comtec CDM-840 - ALARMS Interface Connector (DB-15 M); Table 3-4. ALARMS Connector Pinouts

CDM-840 Remote Router MN-CDM840
Rear Panel Connections Revision 3
3–10
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:
Table 3-4. ‘ALARMS’ Connector Pinouts
PIN #
SIGNAL FUNCTION
NAME
1
GROUND
GND
9
EXT CARRIER OFF
EXT-OFF
2
ES/NO VOLTAGE (0 TO 10 VOLTS)
ES/NO
10
RESERVED +3.3V INPUT CMOS LEVEL
N/C
3
NO CONNECTION
N/C
11
NO CONNECTION
N/C
4
UNIT FAULT
UNIT-COM
12
UNIT FAULT (ENERGIZED, NO FAULT)
UNIT-NO
5
UNIT FAULT (DE-ENERGIZED, FAULTED)
UNIT-NC
13
TX TRAFFIC
TX-COM
6
TX TRAFFIC (ENERGIZED, NO FAULT)
TX-NO
14
TX TRAFFIC (DE-ENERGIZED, FAULTED)
TX-NC
7
RX TRAFFIC
RX-COM
15
RX TRAFFIC (ENERGIZED, NO FAULT)
RX-NO
8
RX TRAFFIC (DE-ENERGIZED, FAULTED)
RX-NC
Connector Type
Name
Description
Type ‘D’ 15-pin male
ALARMS In/Out