Synxcom SM9234D, User Manual

Page: 149 / 216

AT Commands
Page 149
Fax Class 1 and Fax Class 1.0 Commands
Fax I/O Processing
The fax I/O interface supports asynchronous serial and parallel interfaces. The
character format is 8 bits data, no parity, and 1 stop bit. Start and stop elements
are removed from the transmit data and added to the receive data. Both transmit
and receive data are buffered. Flow control using XON/XOFF or RTS/CTS is
provided.
Unique control character strings are identified, filtered, or reinserted into the I/O
date stream. These control characters and their resultant action are described
below.
DTE-to-Modem Transmit Data Stream
Characters Detected Action Taken
<DLE><data> Delete <DLE><data> characters.
<DLE><ETX> Recognize as a string terminator and take appropriate action.
<DLE><DLE> Replace with single <DLE> character.
Modem-to-DTE Receive Data Stream
Characters Detected Action Taken
<DLE> Insert extra <DLE> ahead of <DLE>.
The modem also identifies the end of a frame by inserting <DLE><ETX> into the
data stream after the FCS bytes.
Fax Mode Selection
Fax Class 1 and Fax Class 1.0 commands are identified in Table A-17. Fax Class
1.0 includes all Fax Class 1 commands.