Comtech EF Data SDM-300A, Installation And Operation Manual

Page: 217 / 398

Options SDM-300A Satellite Modem
A–28 Rev. 4
A.1.4.5 ASYNC Remote Operation
Remote modems can be controlled over the ASYNC channel from the local (or “hub”)
modem. Refer to Table A-4 for a list of combinations:
Table A-4. ASYNC Remote Operation
Configuration
#
Local
Modem
To Remote
Modem Table #
1 EIA-232 EIA-232 Table A-5
2 EIA-232 EIA-485 (4-wire) Table A-6
3 EIA-232 EIA-485 (2-wire) Table A-7
4 EIA-485 (4-wire) EIA-232 Table A-8
5 EIA-485 (4-wire) EIA-485 (4-wire) Table A-9
6 EIA-485 (4-wire) EIA-485 (2-wire) Table A-10
7 EIA-485 (2-wire) EIA-232 Table A-11
8 EIA-485 (2-wire) EIA-485 (4-wire) Table A-12
For each of the above combinations, front panel control settings and pinouts for local and
remote cables are listed in the following sections:
Before remote ASYNC communications can be implemented, the following must occur:
•
At both the local and remote modems, front panel configuration parameters must
be set for each type of configuration.
•
Industry-standard cables must be used at both modems.
To implement remote ASYNC operation, use the configuration information found in the
applicable section and perform the following steps:
1. Set the jumpers on the remote modem M&C/Display PCB according to the
information found in the applicable configuration section.
2. Set the local modem front panel controls according to the information found in
the applicable configuration section.
3. Connect the local modem 25-pin ASYNC connection (via breakout panel or Y
cable) to the terminal using the pinout information found in the applicable
configuration section. Refer to Figure A-5 and Figure A-6.
4. Set the remote modem front panel controls according to the information found in
the applicable configuration section.
5. Connect the remote modem 25-pin ASYNC connection (via breakout panel or Y
cable) to the 9-pin J6 port at the rear of the modem using the pinout information
found in the applicable configuration section. Refer to Figure A-6 and
Figure A-7.