Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 177)

AN93
Rev. 1.3 177
+VTS = [<freq1>,
<freq2>, <dur>],[...]...
DTMF and Tone Generation
This command can be used to produce single-frequency tones and double-frequency
tones (i.e. DTMF digit). All three parameters are required for correct operation.
<freq1>
Frequency one, which has a range of 0, 200-3200 Hz.
<freq2> Frequency two, which has a range of 0, 200-3200 Hz.
<dur> Duration of the tone(s) in 10 ms units.
For only a single tone, use <freq1> with zero value for <freq2>. Bracket syntax can be
used to group sets of tones to generate simple melodies, e.g.
+VTS=[500,0,10],[600,200,20],[700,250,30]
+VTX
Transmit Voice Stream
Enable DTE transmit of voice stream to DCE. The DCE will return a CONNECT
response. The DTE sends the voice stream as defined by the +VSM command. Any
0x10 character in the voice stream must be shielded with a <DLE>. The DTE issues a
<DLE><ETX> sequence to terminate the transmit stream. The DCE will respond with
<DLE><ETX> followed by OK. The DCE can be configured to terminate the stream
using the DTE/DCE Inactivity Timer, which is configured using the +VIT command.
Table 110. Extended AT+ Command Set (Continued)
Command Action