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CDM-740 Advanced Satellite Modem
Rear Panel Connector Pinouts
3.4.3
Remote Control Interface Connector, DB-9M
Pin #
1
2
3
4
5
6
7
8
9
* Use for 2-wire EIA-485 operation
3.4.4
EXT/INT REF Connector, BNC
Connector Type
BNC
The Remote Control Interface is a 9-pin Type 'D' male connector. It is
intended for connection to an M&C computer or terminal device, and is user
selectable for either EIA-232 or EIA-485. Refer to Table 3-4 for pinouts.
Table 3-4. Remote Control Connector Pinouts
Description
Ground
EIA-232 Transmit Data
EIA-232 Receive Data
Reserved - do not connect to this pin
Ground
EIA-485 Receive Data B
EIA-485 Receive Data A
EIA-485 Transmit Data B
EIA-485 Transmit Data A
The Ext/Int Ref connector is a BNC female connector. The signal supplied here
by the user is used for phase-locking the internal 10MHz reference oscillator, and
can be 1, 2, 5, 10 or 20 MHz. The impedance is matched for 50/75Ω, and requires
a level in the range –6 to +10 dBm.
Description
External Reference
*
*
Direction
In/Out
3–5
Revision 0
MN-CDM740
Direction
–
Out
In
–
–
In
In
Out
Out
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