SATEL-TR489
Integration Guide, Version 0.9
32
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.
Detailed SL commands required for frequency band switch can be found from SL commands list
available at manufacturers web site:
https://www.satel.com/support-and-services/downloads/
7.2
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 by using SL commands or toggling the “
SL
Command mode
” parameter via the
SATEL Configuration Manager,
version v1.12.3 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 by using the below described procedure. Regardless of
original SL command
–
setting state, changing the setting state with this procedure will effect to
the reception process of the radio module. SL command
–
setting state can be changed only via
SATEL Configuration Manager in maintenance access level.
Note1
To enable the SL Commands* (disables interface transmission and reception):
•
Send three “+” characters via serial port so that there is at least three bytes delay
between each character. The response is “OK”, when successfully
set.
<+><at least three bytes pause><+><at least three bytes pause><+>
To disable the SL Commands* (enables radio interface transmission and reception):
•
Send three “
-
” characters via serial port so that there is at least three bytes delay
between each character. The response is “OK”, when successfully
set.
<-><at least three bytes pause><-><at least three bytes pause><->
*) Regardless of the set state for the SL command mode.
Note2
The “+ + +” and “
- - -
” procedures are not allowed to be used, when radio is transmitting or
receiving data (i.e. the application data occupies the TD or RD lines of the radio).
Note 3
900MHz frequency band parameters set via SL commands require device restart for the new parameters to
be taken into use. The device reset is performed during exiting the command mode (---).
