SATEL-EASy+
User guide
Version 1.33
56
11 SL COMMANDS
11.1 Changing parameters using the 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. The terminal device is either a PC or a programmable logic (PLC)
together with suitable (terminal) program. SL commands must be enabled using Programming
Mode before they can be used.
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=5
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 and pin 12 of the serial connector MUST
NOT be connected to ground (GND). SL command is properly recognised also in the case when
the command string is terminated in <CR> (=ASCII character no. 13, Carriage Return, 0x0d) or
<CR><LF> (<LF> = ASCII char. no. 10, Line Feed, 0x0a). Pause according to set Pause Length -
parameter is required also in this case. 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.
CR/LF characters are added to end the response messages (unless they are already present) in
order to make parsing easier. Settings can be toggled, SL Commands ON/OFF, CR/LF ON/OFF.
Note: SL commands work in the command mode always independent from the setting.
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. SL command response time depends on the used command. Typical
response time is ~100ms and upwards. Recommended safe timeout for SL command response
is 500ms.
To get information of the latest and/or special SL commands please contact SATEL or local
SATEL distributor: https://www.satel.com/where-to-buy/.
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