Comtech EF Data SDM-650B - Manual (Page 216)

Remote Control Operation SDM-650B Satellite Modem
B–40 Rev. 6
B.2.3.7 Differential Encoder Enable
Command: <add/DENC_xxx”cr”
Response: >add/DENC_xxx”cr”lf”]
Status Only: <add/DENC_”cr”
Response:
>add/DENC_xxx”cr”lf”]
Where: xxx = ON or OFF.
B.2.4 Demodulator Configuration Commands
B.2.4.1 Set Demodulator Frequency
Command: <add/DF_nnn.nnnn”cr”
Response: >add/DF_nnn.nnnn”cr””lf”]
Status Only: <add/DF_”cr”
Response:
>add/DF_nnn.nnnn”cr””lf”]
Note: nnn.nnnn = 50.0000 to 90.0000, and 100.0000 to 180.0000 for the 140 MHz
modulator.
B.2.4.2 Demodulator Rate
The demodulator has four symbol rate filters. Each filter is for a specific symbol rate. The
data rate and decoder rate for each filter must be established upon initial demodulator
installation, and when circumstances indicate the need to do so.
Filters are designated as A, B, C, and D. If a filter is not physically present in the system,
it may be assigned “N/A” (not assigned).
Additionally, filters which are factory programmed may not be remotely programmed,
and will return the “error 5” message when a programming command is issued.
Note: For variable rate demodulator option:
1. Demodulators with the variable rate option installed may have four
preprogrammed rates available by using the filter rate assignment commands.
These rates are selected using the standard “SDRx_” commands.
2. Modems that have the variable rate option installed will also respond to the
special “SDRV_” command. This allows for truly variable rate control, while
maintaining compatibility with previous systems.