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The service class may be set by the DTE from the choices available using the "+FCLASS=<VALUE>"
command.
General Rules
1. +Fnnn commands must be entered completely, otherwise an ERROR response is sent.
2. All response messages are preceded and followed by <CR><LF>. Multiple response commands
(e.g., +FDIS: +FCSI: and +FDCS:) will, therefore, appear to a have a blank line between them.
3. Fax Class 2 commands can be separated by the ":" character. The ";" character can be omitted if
desired. Non-data commands cannot be separated by the ";" which is allowed as a dial modifier.
4. All Class 2 commands are assumed to be the final command on a command line. Additional
characters will be ignored.
5. An ERROR message will be generated if any of the following conditions occur:
a. A Class 1 command is received while in Class 2.
b. A Class 2 command is received while in Class 1.
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 Section 3.2/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.
DCE to DTE Streams
The DTE must filter the data stream from the DCE, and remove all character pairs beginning with
<DLE>. The DTE must recognize <DLE><ETX> as the stream terminator. The DTE must recognize
<DLE><DLE> and reinsert a single <DLE> in its place.
The DCE filters stream data to the DTE, and inserts extra <DLE> characters ahead of data.
Multi-Tech Systems, Inc. SocketModem MT5600SMI/MT5656SMI Reference Guide (S000306C)
Chapter 3 – Fax Class 2 Commands
78
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