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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:
Configuration
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:
•
•
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
2. Set the local modem front panel controls according to the information found in
3. Connect the local modem 25-pin ASYNC connection (via breakout panel or Y
4. Set the remote modem front panel controls according to the information found in
5. Connect the remote modem 25-pin ASYNC connection (via breakout panel or Y
A–28
Table A-4. ASYNC Remote Operation
Local
#
Modem
1
EIA-232
2
EIA-232
3
EIA-232
4
EIA-485 (4-wire)
5
EIA-485 (4-wire)
6
EIA-485 (4-wire)
7
EIA-485 (2-wire)
8
EIA-485 (2-wire)
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.
information found in the applicable configuration section.
the applicable configuration section.
cable) to the terminal using the pinout information found in the applicable
configuration section. Refer to Figure A-5 and Figure A-6.
the applicable configuration section.
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.
To Remote
Modem
Table #
EIA-232
Table A-5
EIA-485 (4-wire)
Table A-6
EIA-485 (2-wire)
Table A-7
EIA-232
Table A-8
EIA-485 (4-wire)
Table A-9
EIA-485 (2-wire)
Table A-10
EIA-232
Table A-11
EIA-485 (4-wire)
Table A-12
SDM-300A Satellite Modem
Rev. 4
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