Siemens M20 Terminal Technical Description page 122

Siemens Information and Communication Products
AT^SMSO Switch off mobile station turn off
Test command Response
AT^SMSO=? OK
Execute command Response
AT^SMSO Device switches off immediately (max. deactivation time 1.5 s–6 s)
OK
Note1: the IGNITION signal is checked every 100 ms. If the signal goes LOW, another two checks
are performed at 100 ms intervals to ascertain whether the signal remains LOW. If it does, the shut-
down sequence is initiated (for details, see "AT^SMSO"). If the two additional checks show that
the signal is no longer LOW, the checks sequence restarts.
Note2:
Parameter
Reference Note
AT^SNFA Set or query of microphone attenuation
Test command Response
AT^SNFA=? ^SNFA: (list of supported <atten>s) OK
Parameter
see set command
Read command Response
AT^SNFA? TA returns the attenuation value.
Note: if microphone is muted, TA returns value 0.
^SNFA: <atten> OK
Parameter
see set command
Set command Response
AT^SNFA= TA controls the large-scale attenuation on the microphone path.
<atten>
Note: if microphone is muted, set is disabled.
OK
Parameter
<atten>
Reference Note
GSM Engine A1 Value 0 can be set only by AT^SNFM=0
Version 8 dated 15.03.00
if signal of connector 1 is set to low = device is switched off.
attenuation/dB = 20*log (<atten> /16384
0 (0x0) – 65535 (0xFFFF)
AT command interface
A
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