SATELLINE-3AS NMS / Epic NMS / VHF
User Guide, Version 3.0
74
Note that the use of <LF> is optional the radio modem does not require it.
If multiple SL commands are sent to the radio modem the next command can be given after
receiving the response ("Ok" or "Error" or the value) 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.
The radio modem handles all data strings with the prefix 'SL' as SL commands. Invalid SL
commands are ignored. Note also that the radio modem does not transmit the SL commands.
The radio modem responses using the following format:
<STX>SL<Response Data><ETX><CR><LF>
, where
<STX> Start of Text character (0x02 in hexadecimal)
<Response Data> is a character string, the actual reply to the previous SL command.
The radio modem acknowledges all commands by replying "O
OK" (command carried out
or accepted) or the requested value, or an "EERROR" (command not carried out or
interpreted as erroneous) message.
<ETX> End of Text character (0x03 in hexadecimal)
The frame characters ease the implementation of parser software for the DTE.
For example the response for SL@F? command when using SL commands is:
SL@F?
-125 dBmSL@F?
-124 dBmSL@F?
-125 dBmSL@F?
-125 dBmSL@F?
-124 dBmSL@F?
-125 dBmSL@F?
-124 dBmSL@F?
For example the response for SL@F? command when using Extended SL commands is:
SL@F?
SL:-124 dBm
SL@F?
SL:-125 dBm
SL@F?
SL:-125 dBm
