SATEL Proof-TR4+/R4+/TR9
User Guide, Version 2.2
16
4.2
SL commands
A terminal device can command or configure the radio modem via the serial data interface by
using
SL commands
(similar to AT commands in traditional wired modems) that are applicable
especially in cases where radio modems are to be integrated seamlessly inside a system behind
the integrator’s own user interface.
4.2.1
Command mode
Firmware provides the
Command mode
in which the data transfer is blocked, thus making the
use of SL commands easier without received data disrupting the interpretation of the SL
command responses. The command mode is activated by entering three successive plus
characters separated by a time delay greater than defined by Pause length setting:
<pause>+<pause>+<pause>+
The
Command mode
is terminated (and
Data mode
is activated) by entering three successive
minus characters:
<pause> - <pause> - <pause> -
The modem responds the above sequences with OK message.
Note. SL commands operate in the command mode independent from the value of SL
Commands mode setting.
4.2.2
Operation of SL commands
Depending on the active value of
SL command mode
setting, SL commands work in one of the
four operational modes:
•
OFF
o
SL commands work only in the
Command mode
but not in the
Data mode
o
CR/LF feature is OFF.
•
ON
o
SL commands are always ON
–
both in the
Command mode
and in the
Data mode
o
CR/LF feature is OFF
•
ON-CR/LF
o
SL commands are always ON
–
both in the
Command mode
and in the
Data mode
o
CR/LF feature is ON
•
OFF-CR/LF
o
SL commands work only in the
Command mode
o
CR/LF feature is ON
Note.
Due to legacy reasons some SL command responses are terminated by CR character,
some not. CR/LF feature appends the combination of CR and LF characters to the end of
the response message (unless the message already ends with it), thus making the parser
design easier for system integrators.