Appendix B
Changing Parameters Using the SL Commands
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SRL-35 Operator’s Manual P/N: 1003224-01
0x0d) or <CR><LF> (<LF> = ASCII char. no. 10, Line Feed, 0x0a). If multiple SL commands are sent to the
radio modem the next command can be given after receiving the response ("Ok" or "Error") of the
proceeding command. In addition, it is recommended to implement a timeout to the terminal software for
recovering the case when no response is received from the radio modem.
When the power of a radio modem is switched off the configuration settings of a radio modem always
return to values defined initially using the Programming Mode, thus resetting any settings changed using
SL Commands during power on. It is however possible to save settings changed by using SL Commands and
to make them the new configuration settings.
The radio modem will acknowledge all commands by returning an "OK" (command carried out or accepted)
or the requested value, or an "ERROR" (command not carried out or interpreted as erroneous) message.
In case you need more information on the time delays related to the use of SL Commands, please contact
the manufacturer.
Frequency
Table 31. Frequency Commands
Command Effect and description of command
SL&FR=nnn.nnnnn Set RX frequency to nnn.nnnnn MHz
SL&FT=nnn.nnnnn Set TX frequency to nnn.nnnnn MHz
SL&F=nnn.nnnnn Set both RX&TX-frequency to same nnn.nnnnn MHz
SL&FR? Get RX frequency (response 'nnn.nnnnn MHz')
SL&FT? Get TX frequency (response 'nnn.nnnnn MHz')
SL&F? Get RX&TX frequencies (response TX nnn.nnnnn MHz, RX nnn.nnnnn MHz)
SL&C? Get Reference (Center) frequency (response 'nnn.nnnnn MHz')
SL&C=nnn.nnnnn Set Reference (Center) frequency to nnn.nnnnn MHz
SL&+=nn Set RX&TX frequency nn channels above reference frequency
Frequency = Reference frequency + nn * Channel spacing, where nn=[0...Number of channels/2]
SL&-=nn Set RX&TX frequency nn channels below reference frequency
Frequency = Reference frequency – nn * Channel spacing, where nn=[0…Number of channels/2]
SL&N? Get current RX&TX- frequency deviation from reference frequency as channels (Frequency – Center
frequency)/Channel spacing (response ‘+nn’ or ‘-nn’)
SL&W? Get channel spacing (response ‘nn.n kHz’)
SL&D=x Set operational mode of the radio. The different values of x are:
S = Single Channel
D = Dual Channel
R = Reverse Dual Channel
Note! Use this command only, if the setup of the frequency bands matches the Dual Channel operation.
SL&D? Get operational mode of the radio. The response is one of the following:
S = Single Channel
D = Dual Channel
R = Reverse Dual Channel
Note! Use this command only, if the setup of the frequency bands matches the Dual Channel operation.
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