Integration Guide

SATELLINE-M3-TR3

and –TR4

Integration Guide, Version 1.6

3 CHANGING PARAMETERS USING SL COMMANDS

The controlling terminal device can change the configuration settings of the module. This is

accomplished with the help of SL commands. SL commands can be used to change e.g. the

frequency or addresses. It is also possible to ask the radio transceiver module to show current

settings which are in use.

3.1 SL Commands

An SL command is a continuous string of characters, which is separated from other data by pauses

which are equal or greater than time defined by Pause length parameter (default=3 characters)

in the set-up. No extra characters are allowed at the end of an SL command.

Serial interface settings are the same as in data transfer. SL command is properly recognised also

in the case when the command string is terminated by <CR> (=ASCII character no. 13, Carriage

Return, 0x0d) or <CR><LF> (<LF> = ASCII char. no. 10, Line Feed, 0x0a). If multiple SL

commands are sent to the module, 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 module.

The transceiver module 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.

The SL commands are listed in appendix, pages 26.

3.2 SL Command Mode

The SL commands have always been enabled in the previous products like M3-R3. When the SL

commands are enabled there are possibilities that the user data may start with the characters “SL”

which is handled as the SL command. This has caused the firmware to go to the continuous SL

command search mode and any data has not been sent or even an “ERROR” acknowledgment

has been received. To avoid this kind behavior the user can disable the SL commands. The SL

commands can be disabled or enabled using the “SL Command mode” parameter. The user can

do this via the SATEL Configuration Manager, version v1.3.15 or newer.

By default the SL Command mode is set to ON. If the SL Command mode is set to OFF then the

SL commands can be enabled or disabled using the following procedures: