24
Code Sent to DTE
Meaning
<DLE>0 - <DLE>9,
<DLE>*, <DLE>#,
<DLE>A - <DLE>D
DTMF
Digits 0 through 9, *, #, or A through D detected by the modem.
<DLE>a
Answer Tone(CCITT)
Send to the DTE when the V.25/T.30 2100 Hz Answer Tone (Data or Fax) is
detected. If the DTE fails to react to the code, and the modem continues to
detect Answer tone, the code is repeated as often as once every 0.5 second.
<DLE>b
Busy
Send to DTE when the busy cadence is detected. The modem sends the busy
<DLE>b code every 4 seconds if busy continues to be detected and the DTE
does not react. This allows the DTE the flexibility of ignoring what could be a
false busy detection.
<DLE>c
Calling Tone
Sent when the T.30 1100 Hz Calling Tone (Fax Modem) is detected. The
modem assumes the calling tone is valid and sends this code only after 4 seconds
of proper cadence has been detected. If the DTE does not react to this code, the
code is repeated as often as once every 4 seconds.
<DLE>d
Dial Tone
Sent in Voice Receive Mode when dial tone is detected after any remaining data
in the voice receive buffer. The modem sends this code every 3 seconds if dial
tone continues to be detected and the DTE does not react. This allows the DTE
the flexibility of ignoring what could be a false dial tone detection.
<DLE>e
European Data Modem Calling Tone
Sent when the V.25 1300 Hz Calling Tone (Data Modem) is detected. The
modem assumes that the calling tone is valid, and sends this code only after 4
seconds of proper cadence has been detected. If the DTE does not react to this
code and calling tone continues, the code is sent again as often as once every 4
seconds.
<DLE>f
Bell Answer Tone
Sent when Bell 2225 Hz Answer Tone (Data) is detected. If the DTE fails to
react to the code and the modem continues to detect Answer tone, the code is
repeated as often as every 0.5 second.
<DLE>h
Hung Up Handset
Sent immediately when the modem detects that the local handset has hung-up.
<DLE>q
Quiet
Sent in Voice Receive Mode after any remaining data in the receive voice buffer
when the silence detection timer (#VSP) expires and the voice data has been
passed to the DTE.
<DLE>s
Silence
Sent in Voice Receive Mode after the silence detection timer (#VSP) expires
and if valid voice has not been detected (#VSS).
<DLE>t
Handset Off-Hook
Sent one time when the local handset transition go off-hook.
<DLE><ETX>
End of Stream
This code is sent to denote the end of a voice data stream.
Table 1
Содержание MicroModem
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Страница 10: ...10 AT Command Summary October 25 2000 AMIGO USB MicroModem...