Wavecom GSM Modem
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14
3.5. DTMF signals +VTD, +VTS
The GSM module offers the user application to send DTMF tones. One
command shall be used for defining the duration of the tones (default value is
70 ms), the other for sending the Tones.
For defining the duration, the application uses :
AT+VTD=<n>
where <n>*100 gives the duration in ms.
Application to GSM
AT+VTD=1
for defining 100 ms tone duration
GSM to application
OK
command valid
Application to GSM
AT+VTD=100000
GSM to application
+CME ERROR: 3
if the duration is too long (the limit is to
define for each application)
Application to GSM
AT+VTD=0
for setting the manufacturer default value
GSM to application
OK
For sending DTMF tones, the application uses :
AT+VTS=<Tone>
where <Tone> is in {0-9,*,#,A,B,C,D}
Application to GSM
AT+VTS=A
GSM to application
OK
command valid
Application to GSM
AT+VTS=11
GSM to application
+CME ERROR: 4
if the <Tone> is wrong
Application to GSM
AT+VTS=4
GSM to application
+CME ERROR: 3
if there is no communication
Exemple : to send the Tone sequence 13#, the application shall send :
AT+VTS=1
and then wait for
OK
AT+VTS=3
and then wait for
OK
AT+VTS=#
and then wait for
OK
