1:1 Control Connector, Db-9F; Table 3-6. Alarms Connector Pin Assignments; Table 3-7. 1:1 Control Connector Pin Assignments - Comtech EF Data CDM-570A Installation And Operation Manual

CDM-570A/570AL Satellite Modem with Optional Packet Processor
Rear Panel Connectors and Pinouts
•
A pin that can mute the transmit carrier; this requires that the pin be shorted to ground or a
TTL 'low', or that an EIA-232 'high' signal be applied.
•
An analog AGC signal (Pin 2) as an aid to antenna pointing or for driving step-track
equipment.
Pin #
9
10
11
12
13
15
3.2.3.4

1:1 Control Connector, DB-9F

Pin #
9
8
7
6

Table 3-6. Alarms Connector Pin Assignments

Signal Function
1 Ground
EXT Carrier OFF
2 AGC Voltage (Rx signal level, 0 to 10 volts)
No Connection
3 Rx Q Channel (Constellation monitor)
Rx I Channel (Constellation monitor)
4 Unit Fault
Unit Fault (Energized, No Fault)
5 Unit Fault (De-energized, Faulted)
Tx Traffic
6 Tx Traffic (Energized, No Fault)
14 Tx Traffic (De-energized, Faulted)
7 Rx Traffic
Rx Traffic (Energized, No Fault)
8 Rx Traffic (De-energized, Faulted)
9-pin type 'D' female connector (DB-9F) to connect the modem only to
Use this
a CRS-170A (L-Band) or CRS-180 (70/140 MHz) switch in 1:1 redundancy
configurations.

Table 3-7. 1:1 Control Connector Pin Assignments

Description
5 Ground
Fused +12 volt
4 Redundancy In 2
Redundancy Out 2
3 Redundancy In 1
Redundancy Out 1
2 Receive Serial Data – auxiliary channel
Transmit Serial Data – auxiliary channel
1 Ground
Name
GND
EXT-OFF
AGC
N/C
RX-Q
RX-I
UNIT-COM
UNIT-NO
UNIT-NC
TX-COM
TX-NO
TX-NC
RX-COM
RX-NO
RX-NC
Direction
---
Out
In
Out
In
Out
In
Out
---
3–12
MN-CDM570A
Revision 3