Chapter 3: AT Commands Reference
December 31, 2007 AT Commands Reference Manual 3-423
Fax Class 1
Facsimile machines were developed for sending digitized documents over the General Switched
Telephone Network (GSTN) These facsimile terminals are in widespread use around the world.
The operation of facsimile terminals has been standardized in Recommendations T.4, T.6 and
T.30. The cellular network also supports the facsimile service within the cellular network and also
with the GSTN network. The G24 is configured as an external "facsimile DCE", connected to the
terminal by a standard serial port (for example, Recommendation V.24), using serial data
interchange. The G24 supports Fax Class 1, with a few exceptions, marked as "Not supported" in
the table below. The SW flow control is mandatory (using the DC1/ DC3 characters). (ITU -
T.31section 5.3)
The following table shows the Fax Class 1 command summary.
Command Description
+FCLASS Selects, reads or tests the Service Class (Note 1)
+FTS = <Time> Stops/Pauses the transmission
+FRS = <Time> Waits for silence
+FTM = <MOD> Transmits data with <MOD> carrier
+FRM = <MOD> Receives data with <MOD> carrier
+FTH = <MOD> Transmits HDLC data with <MOD> carrier
+FRH = <MOD> Receives HDLC data with <MOD> carrier
+FAR = <off/on> Adaptive reception control
+FCL = <time> Carrier loss timeout
+FDD = <value> Double escape character replacement control
+FIT = <time>, <action> Terminal inactivity timeout
+GMI? Reports manufacturer ID
+GMM? Reports model ID
+GMR? Reports revision ID
+IFC Local terminal-G24 flow control
+IPR Local terminal-G24 serial port rate
A Answers
D <string> Dials
H Hangs up
+FPR Sets the request baud rate.
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