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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 59
Identification Commands
Service Class Indication
A MultiModem modem will report its Service Class capabilities, both the current setting and the range
of services available. This is provided by the +FCLASS parameter. Currently-defined values for the
+FCLASS parameter are:
Parameter Service Class
0 Data modem
1 Fax Service Class 1 (TIA-578, ITU-T.31)
1.0 Fax Service Class 1.0 (ITU-T T.31, Amendment 1)
2 Fax Service Class 2 (EIA 29.2)
2.0 Fax Service Class 2.0 (ITU-T T.32)
2.1 Fax Service Class 2.1 (ITU-T T.32 Amendment 1)
3-7 Reserved (not supported)
8 Voice modem
9-255 Reserved (not supported)
[None] Not supported
The +FCLASS factory default setting is +FCLASS=0. When +FCLASS is set to other than 0 and a call
is made, but the call fails or the modem is disconnected, the +FCLASS value returns to the default
setting (+FCLASS=0).
Class 2.1 +FCLASS?
A modem’s current Service Class setting is tested by the +FCLASS? command. The
response is a single value.
Class 2 +FCLASS?
Same as Class 2.1.
Service Class Capabilities
Class 2.1 +FCLASS=?
The Service Classes available from a modem are tested by the +FCLASS=?
command. The response is a string of values separated by commas. A Class 2.1
MultiModem can respond:
Example: <CR><LF>0,1,2,1.0,2.0,2.1,8<CR><LF>OK<CR><LF>.
Class 2 +FCLASS=?
A Class 2 MultiModem responds similarly; however, older Multi-Tech modems that
do not support Class 2.1 report fewer options.