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15–2
Fax Command Sets
The 2864 series universal modems support four command sets for the fax function,
the Class 1 command set, the TIA PN-2388 Class 2 command set, the TIA 592
Class 2.0 command set, and the ZyXEL Extended Fax AT command set. The Class
1 protocol uses the modem to transmit the fax data only. The complete organiza-
tional overhead for this protocol is handled by the connected computer. The availa-
ble Class 1 commands are listed first in this chapter. Following this, we will briefly
describe the supported Class 2 commands here. Please refer to the TIA document
for a detailed explanation. The newer TIA standard Class 2.0 commands are also
supported. Interested programmers should consult the TIA document for com-
mand details and consult ZyXEL Technical Support for supported features. The lat-
er sections are related to the ZyXEL Extended Fax AT commands.
Class 1 Command Set
The <MOD> parameter takes on the following values:
Command Value Description
+FCLASS=n Service class selection
n=0 Sets to modem mode
n=1 Sets to Class 1 mode
n=2 Sets to Class 2 mode
n=2.0 Sets to Class 2.0 mode
n=6 Sets to ZFAX mode
n=8 Sets to Voice mode
n=Z Sets to ZyXEL fax parallel port print and/or
DRAM store mode. (See also Class Z
AT+F
commands)
Note: 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.
+FTS=n 0-255 Stops transmission and pauses, in10ms units.
+FRS=n 0-255 Waits for silence, in 10ms units.
+FTM=<MOD> Transmits data with a <MOD> carrier.
+FRM=<MOD> Receives data with a <MOD> carrier.
+FTH=<MOD> Transmits HDLC data with a <MOD> carrier.
+FRH=<MOD> Receives HDLC data with a <MOD> carrier.