Comtech EF Data SDM-309B Installation And Operation Manual page 180

SDM-309B Satellite Modem
Each message is ended with a single character which signals the end of message. This
characters is:
!
!
4.0 Configuration Commands/Responses
4.1 Modulator Configuration Commands
4.1.1 Set Modulator Frequency (to nnn.nnnn MHZ, nnn.nnnn = 50.0000-
90.0000)
Command:
Response:
Note: When modulator frequency is changed the RF output is switched off. nnn.nnnn =
50.0000 to 90.0000 and 100.0000 to 180.0000 for the 140MHz modulator.
Status Only:
Response:
4.1.2 Set RF Output
Command:
Response:
Status Only:
Response:
4.1.3 Modulator Rate
The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The
data rate and coder rate for each filter must be established upon initial modulator
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.
*VARIABLE RATE MODULATOR OPTION*
Modulators with the variable rate option installed may have four preprogrammed rates
available by using the filter rate assignment commands. These rates are selected using
MN/U-SDM309B Rev. #
"cr" (carriage return character) for commands.
"]" (end bracket) for responses.
<add/MF_nnn.nnnn"cr"
>add/MF_nnn.nnnn"cr" RF_OFF"cr""lf"]
<add/MF_"cr"
>add/MF_nnn.nnnn"cr""lf"]
ON/OFF
<add/RF_xxx"cr"
>add/RF_xxx"cr""lf"]
<add/RF_"cr"
>add/RF_xxx"cr""lf"]
(xxx = ON or OFF)
Remote Control
B-B–3