Rockwell RCV144ACx, Command Reference Manual

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AT Command Reference Manual
1048 7-7
Table 7-3. Shielded DTE Codes
Code Sent to
Modem
Meaning
<DLE>p
Pause. Sent during Voice Transmit Mode to force the modem to suspend sending voice data to the
selected output device(s). Any data currently in the voice transmit buffer is saved until either a
resume (<DLE>r), or cancel <DLE><CAN>, is received, in which case the data is lost. If a
<DLE><ETX> is received during the paused state, the modem processes it normally, and also
automatically resumes transmission of the data left in the buffer (appended with <DLE><ETX>). Any
other data received from the DTE while in this paused state is placed in the transmit buffer according
to available space, with flow control active. (This command is ignored in other voice submodes.)
<DLE>r Resume. Sent during Voice Transmit Mode to force the modem to resume sending voice data to the
selected output device(s). Any data currently in the voice transmit buffer is now played. (This
command is ignored in other voice modes.) The pause and resume commands are different than a
simple suspension of data; data in the buffer is “frozen” and not played when the DTE pauses.
<DLE>E Purge DCE Buffer. Sent during the transmission or reception of voice/audio data, by embedding the
command in the voice data stream, to purge the corresponding DCE buffer. (See the <DLE><EOT>
code.)
<DLE>u Increment Playback Volume. Sent during audio mode to increment the playback volume. The
<DLE>u action command allows the application to increase the playback volume of the headphone
and speaker outputs during playback while in the data state. Each <DLE>u will increment the
transmit level by 1 unit. Adjustment by a value greater than 1 may be achieved by transmitting a
string of <DLE>u codes. For example, a string consisting of "<DLE>u <DLE>u <DLE>u <DLE>u
<DLE>u" increases the playback volume by a value of 5 units. The <DLE>u code can be used to
adjust the volume within the range of 128-228. (See <DLE><u> and <DLE><d> in Section 7.3.2.)
<DLE>d Decrement Playback Volume. Sent during audio mode to decrement the playback volume. The
<DLE>d action command allows the application to decrease the playback volume of the headphone
and speaker outputs during playback while in the data state. Each <DLE>d will decrement the
transmit level by 1 unit. Adjustment by a value greater than 1 may be achieved by transmitting a
string of <DLE>d codes. For example, a string consisting of "<DLE>d <DLE>d <DLE>d <DLE>d
<DLE>d" decreases the playback volume by a value of 5 units. The <DLE>d code can be used to
adjust the volume within the range of 128-228. (See <DLE><u> and <DLE><d> in Section 7.3.2.)
<DLE><CAN> Cancel. Sent during Voice Transmit Mode to indicate that the DTE has finished transmitting a voice
message and wants the modem to discard any remaining data in the voice transmit buffer. The
modem immediately purges its buffer, and then responds with the VCON message entering Online
Voice Command Mode. (This command is ignored by the modem when not in Voice Transmit Mode.)
<DLE><EOT> Voice Bytes Buffered Query. Sent during the transmission or reception of voice/audio data, by
embedding the command in the voice data stream, to learn the number of corresponding bytes
buffered by the DCE at the moment the <DLE><EOT> command is received by the DCE.
<DLE>XZBBC=n<DLE> is returned by the DCE, in which "n" represents the number of bytes buffered
as a two byte hexadecimal value.
<DLE><ETX> Terminate. Sent during Voice Transmit Mode to indicate that the DTE has finished transmitting a
voice message. The modem completes transmission of any remaining data in the voice transmit
buffer before responding with the VCON message and entering Online Voice Command Mode. (This
command is ignored by the modem when not in Voice Transmit Mode.)