48 Fax Operation
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
units.
+FRS=n 0-255 Wait for silence, in 10 ms units.
+FTM=<MOD> Transmit data with <MOD> carrier.
+FRM=<MOD> Receive data with <MOD> carrier.
+FTH=<MOD> Transmit HDLC data with <MOD>
carrier.
+FRH=<MOD> Receive HDLC data with <MOD>
carrier.
The <MOD> parameter for the preceding commands take the
following values:
Value Modulation Speed Requirements
3 V.21 ch. 2 300 required for FTH & FRH
+FTH and +FRH support value 3 (V.21 ch. 2 / 300 bps) only.
24 V.27ter 2400 required for FTM & FRM
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