Telenetics 56 - Manual (Page 165)

AT Commands
Page 157
c. A Class 1 or Class 2 action command is received while in data modem mode.
d. A Class 2 read-only parameter is given the “=” form of a +F command (e.g.,
AT+FAXERR=5).
e. A Class
Serial Port Speed and Flow Control
During fax mode, the DTE-DCE port speed is 19200 bps.
The DCE provides a speed buffer of 1024 bytes and provides the DC1/DC3
(XON/XOFF) or RTS/CTS method of controlling the data into the buffer. This flow
control is controlled by the &K3 or &K4 command.
This method of data flow control is available only for DTE to DCE direction of data.
There is no provision for data flow control from DCE to DTE.
Data Stream Termination
The DCE exchanges streams of data with the DTE while executing data transfer
commands. These data streams use the termination described in ISO 2111.
The ASCII <DLE> character (016) is used as a special character to shield special
characters. The <DLE><ETX> character pair (<106><003>) is used to mark the end of a
stream. The following patterns are used:
any data...<DLE><ETX> end of stream
any data...<DLE><DLE> single <DLE> in data
any data...<DLE><any byte> delete <DLE><any byte>
DTE to DCE Streams
The DCE filters the data stream from the DTE, and removes all character pairs beginning
with <DLE>. The DCE recognizes <DLE><ETX> as the stream terminator. The DCE
recognizes <DLE><DLE> and reinserts a single <DLE> in its place.
The DTE must filter stream data to the DCE, and insert extra <DLE> characters ahead of
data.