SIM5350 AT Command Set
0 – “Drop DTR” ignored but OK response given. AT H disconnects.
1 – “Drop DTR” and ATH ignored but OK response given.
Examples
AT+CVHU=0
OK
AT+CVHU?
+CVHU: 0
OK
4.8 AT+VTS DTMF and tone generation
Description
This command allows the transmission of DTMF tones and arbitrary tones which cause the Mobile
Switching Center (MSC) to transmit tones to a remote subscriber. The command can only be used
in voice mode of operation (active voice call).
NOTE: The END event of voice call will terminate the transmission of tones, and as an operator
option, the tone may be ceased after a pre-determined time whether or not tone duration has been
reached.
SIM PIN References
YES 3GPP TS 27.007
Syntax
Test Command Responses
AT+VTS=? +VTS: (list of supported<dtmf>s)
OK
Write Command Responses
OK AT+VTS=<dtmf>
[,<duration>]
AT+VTS=<dtmf-string>
ERROR
Defined values
<dtmf>
A single ASCII character in the set 0-9, *, #, A, B, C, D.
<duration>
Tone duration in 1/10 seconds, from 0 to 255. This is interpreted as a DTMF tone of different
duration from that mandated by the AT+ V T D command, otherwise, the duration which be set the
AT+V TD command will be used for the tone (<duration> is omitted).
SIM5350_ATC_V1.02 6/9/2014
36
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