U-90E
Data/Fax
Modem
Special Functions
11-3
11.3 Fax Command sets
The U-90E supports two command sets for fax operation:
Class 1 command set
TIA 592 Class 2.0 command set
11.3.1 Defining the Fax Command Sets
The EIA Class 1 fax commands are a set of AT fax commands defined by EIA/TIA
(Telecommunications Industry Association) for controlling fax/modems from a computer
through the serial RS-232 interface. All fax/modems and fax software supporting this
standard will be compatible with each other.
Class 1 commands control on-line modem negotiation. 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 EIA/TIA-
578 standard.
Class 2.0 command set is a formally approved version of the class 2 standard and is also
called the EIA/TIA-592 standard. The class 2 commands allow the modem to do many
negotiations simultaneously.
11.3.2 Service Class 1 Commands
Table 11-1 Service Class 1 Commands
Command
Description
Value
+FCLASS=n Service
Class Identification
and Control
n=0:Sets to modem mode
n=1:Sets to Class 1 mode
n=2.0:Sets to Class 2.0 mode
n=8:Sets to Voice mode
+FTS=n
Stop Transmission and
n=0-255 in 10 ms units.
