Product data

USRobotics
Command Reference
Fax Class 1 and Fax Class 1.0 Commands - 109
Fax Origination
Origination of fax calls is made using the ATD command. Upon completion of the
dial function, a calling tone at 1100 Hz is transmitted, with a cadence of 0.5
seconds on and 3 seconds off. The modem automatically enters mode +FRH=3
and sends the CONNECT message to the DTE when FSK flags are detected from
the remote.
Fax Answering
Answering of fax calls is identical to answering of data calls with the exception that
the modem enters the fax handshaking mode instead of the data handshaking
mode after going off-hook. If +FAE=0, the modem, after sending answer tone,
automatically enters fax mode (+FTH=3), sends the CONNECT message to the
DTE, and starts sending FSK flags. If +FAE=1, the modem determines whether
the caller is a data modem or fax modem and sends the DATA or FAX result code,
respectively, to the DTE.
Fax Control Transmission
Fax control transmission is initiated by the +FTH=<mod> command. After this
command is issued, the modem generates the CONNECT message and
+FDD=<value> Double escape character replacement control - X
+FIT=<time>,
<action>
DTE inactivity timeout - X
+FPR=<rate> Fixed DTE Rate - X
+FMI Report manufacturer ID - X
+FMM Report model ID - X
+FMR Report revision ID - X
+FLO Flow Control - X
+IFC Local DTE-modem flow control (see +IFC command) X X
+IFC Local DTE-modem flow control (see +IFC command) X X
A Answer (see A command) X X
D <string> Dial (see D command) X X
H Hangup (see H command) X X
X = Applicable; -
= Not applicable
Table 5-1: Fax Class 1 and Fax Class 1.0 Commands
Command/
Parameter
Function Applicable in
Fax Class 1
Applicable in
Fax Class 1.0