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Fax Operation
If the DTE sends a character while executing the answer command and
before CED is completed, the call is released and the modem will send
the NO CARRIER result code.
On Hook — H
In fax mode, the H command instructs the modem to stop any
transmission and terminate the call by going on hook.
Off Hook — H1
The H1 command instructs the modem to go off hook. In fax mode, this
might be used when the user has used manual dialing to place a fax call.
In this case, no CNG tones are generated and the initial +FRH=3 is not
implied; it must be explicitly issued by the software.
Class 0 Operation — +FCLASS=0
Setting the Service Class to 0 with the +FCLASS=0 command sets the
modem in data mode. This default setting is normally only changed by
software if needed.
Class 1 Operation — +FCLASS=1
Setting the Service Class to 1 with the +FCLASS=1 command
configures the modem as a Class 1 fax modem. This command is
normally only issued by the fax software if needed. When set, the LCD
displays FAX CLASS 1 MODE.
Service Class Indication — +FCLASS?
The current Service Class setting can be determined with the
+FCLASS? command. A 0 response indicates the modem is configured
for data mode while a 1 indicates it is set for fax mode. This information
text is preceded and followed by <CR><LF> in addition to being
followed by an appropriate result code response.
Service Class Capabilities — +FCLASS=?
The available Service Classes can be revealed by the +FCLASS=?
command. The modem responds with the information text 0, 1
(preceded and followed by <CR><LF>), indicating that the modem
supports both data communication and Class 1 fax operation.
9-6
V.3600
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