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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 52
The following table illustrates how each of the parameter types is set or read, with typical responses.
Parameter type Set Read Read valid values
Numeric AT+FLP=1
ok
AT+FLP?
1
ok
AT+FLP=?
0,1
ok
String AT+FLI=”123”
ok
AT+FLI?
”123”
ok
AT+FLI=?
(20) (32 -127)
ok
Compound AT+FIS=,,2,0
ok
AT+FIS?
0,1,1,0,0,0,0,4
ok
AT+FIS=?
(0-1), (0-3), (0-4), (0-2), (0), (0), (0-7)
ok
Command Execution Mode
In command execution mode, responses indicate the progress of an action command. Response
format is the same as the format of a parameter that is read except that “=” following the parameter
name is replaced by “:”. All action commands can be aborted by sending a single byte of serial data
to the modem while it is in command execution mode. This not only aborts the command, but initiates
the fax disconnect sequence.
Data Transfer Mode
Data transfer mode is entered after the CONNECT response is given (or a 1 response is given in
terse mode). This is initiated by either a +FDT or +FDR action command.
When the connect response is initiated by a +FDT command, any data sent to the modem after the
connect response is sent across the phone line to the receiving fax modem. This data is a
compressed bit map for the page being transmitted. It must be formatted according to the ITU-T
standard T.4 (or according to the T6 standard, in the case of MMR compression). When data is sent
to the modem, single DLE characters (ASCII 10h) are replaced by two DLE characters, and, for Class
2 fax only, the end of the fax page is indicated by a DLE ETX sequence (ASCII 10h followed by
ASCII 03h).
When data is sent to the modem, single DLE characters (ASCII 10h) are replaced by two DLE
characters, and the end of the fax page is indicated differently in different fax standards:
in Class 2, end-of-page is indicated by a DLE ETX sequence (ASCII 10h followed by ASCII 03h);
in Class 2.0 and Class 2.1, end-of-page is indicated by
DLE-EOP (ASCII 10h ASCII 2Eh)
DLE-MPS (ASCII 10h ASCII 2Ch)
DLE-EOM (ASCII 10h ASCII 3Bh)
When the connect response is initiated by a +FDR command, any data received from the modem
after the connect response is data received from the transmitting fax modem. This data is a
compressed bit map for the page being received, formatted according to ITU-T standard T.4 (or
according to the T6 standard, in the case of MMR compression). When data is received from the
modem, DLE DLE character sequences are replaced by a single DLE character. The DLE ETX
character sequence indicates that the end of the fax page has been received.