Utility Connections; Remote Control Interface Connector, Db-9M; Form-C Traffic Alarms Connector, Db-15M; Table 3-5. Remote Control Interface Connector Pin Assignments - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Rear Panel Connectors and Pinouts
3.4

Utility Connections

3.4.1 Remote Control Interface Connector, DB-9M

The Remote Control interface connection is a 9-pin type 'D' male (DB-9M)
connector. This port is intended for connection to an M&C computer, or terminal
device. This interface is user-selectable for either EIA-232 or EIA-485.

Table 3-5. Remote Control Interface Connector Pin Assignments

Pin #

3.4.2 Form-C Traffic Alarms Connector, DB-15M

satellite earth stations. Additionally, the receive I and Q demodulator samples are provided on
this connector. Connecting these signals to an oscilloscope in X,Y mode will provide the receive
signal constellation diagram, which is a useful diagnostic aid. A pin is also provided which 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.
As an aid to antenna pointing or for driving step-track equipment, an analog AGC signal is
provided on Pin 2 of this connector.
See T able 3-6 on the next page for the Alarms connector pinouts.
3 2
1
2 EIA-232 Transmit Data
3 EIA-232 Receive Data
4 Reserved - do not connect to this pin
5
6 EIA-485 Receive Data B *
7 EIA-485 Receive Data A *
8 EIA-485 Transmit Data B
9 EIA-485 Transmit Data A
* Use for 2-wire EIA-485 operation
The Alarms connector is a 15-pin type 'D' male (DB-15M) connector. Unit
alarms are provided on this connector, affording user access to the Form-C
relay contacts which indicate the fault status of the unit. These contacts are
typically connected to an external fault monitoring system often found in
Description
Ground
Ground
3–8
Revision 12
MN/CDM570L.IOM
Direction
Out
In
In
In
Out
Out