Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 83 23.06.2010
Response
TA reports one or more lines of information text which permit the user to
identify the version, revision level or data or other information of the
device.
Revision:<Revision Id>
OK
Execution
Command
AT+FMR
Parameter
<Revision Id> the version, revision level or data or other information of
the device.
Reference
EIA/TIA-578-D
Note
3.2.40AT+VTD Tone Duration
AT+VTD Tone Duration
Response
+VTD: (list of supported <n>s)
OK
Test Command
AT+VTD=?
Parameter
see Write Command
Response
+VTD: <n>
OK
Read Command
AT+VTD?
Parameter
see Write Command
Response
This Command refers to an integer <n> that defines the length of tones
emitted as a result of the +VTS Command. This does not affect the D
Command.
OK
Write Command
AT+VTD = <n>
Parameter
<n> 1-255 duration of the tone in 1/10 seconds
Reference
GSM 07.07 [13]
Note
3.2.41 AT+VTS DTMF and Tone Generation
AT+VTS DTMF and Tone Generation
Test Command Response