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Fax Operation 55
Class 1 commands control on-line modem negotiation while Class 2
commands allow the modem to do many negotiations
simultaneously. The Class 1 protocol uses the modem to transmit
fax data only. The complete organizational overhead for this
protocol is handled by the connected computer. The Class 1
command set is also called the TIA-578 standard.
Several revisions of the class 2 standard exist. Implementations
conforming to different revisions may not work together. A
formally approved version is the Class 2.0 command set, also called
the TIA-592 standard.
Class 1 Command Set
Command Value Description
+FCLASS=n Service class selection.
n=0 Set to Data mode.
n=1 Set to Class 1 mode.
n=2 Set to Class 2 mode.
n=2.0 Set to Class 2.0 mode.
n=6 Set to ZFAX mode.
n=8 Set to Voice mode.
OONOTE: IF S57.4=0 (DEFAULT), THE RESPONSE TO THE +FCLASS=? COMMAND WILL
NOT REPORT CLASS 1 CAPABILITY. THIS IS DUE TO THE FACT THAT SOME FAX
SOFTWARE PACKAGES MAY GET CONFUSED BY THIS RESPONSE.
Command Value Description
+FTS=n 0-255 Stop transmission and pause, in 10 ms