Multi-Tech Systems MT5600SMI-PL34 Examples, Fax Class 1 Calling Sequence Transmitting a Single

Chapter 6 – Fax Class 1 and Class 1.0 Commands

Examples

Examples of calling (transmitting) and answering (receiving) one page using Fax Class 1 commands are shown in Table 6-4 and Table 6-5, respectively. The examples show the interchange between the DTE and the modem for various cases. Comments are included to explain how to handle various situations. Commands and responses are in upper case and comments are in lower case. All streams of data denoted by <..frame> are terminated by the <DLE><ETX> characters.

Table 6-4. Fax Class 1 Calling Sequence (Transmitting a Single Page)

DTE Commands	Modem Responses	Local Modem Action	Remote Station Action	Notes
AT+FCLASS=1	OK	Set Class 1
ATDT<string>		Dial and send CNG	Answer
		Look for V.21	send CED, V.21	AT+FRH=3
	CONNECT	Detect flags	Send HDLC flags	implied by dialing with
				+FCLASS=1.0
	<NSF frame>		Send NSF frame
	<DLE><ETX>
	OK
AT+FRH=3	CONNECT	Detect flags
	<CFI frame data>	get CSI	send CSI frame
	<DLE><ETX>	get FCS
	OK	accept FCS	check FCS	Frame status OK
AT+FRH=3	CONNECT	Detect flags		DTE must detect final
	<DIS frame data>	get DIS	send DIS frame	frame bit to anticipate
	<DLE><ETX>	get FCS		loss of carrier
	OK	accept FCS	check FCS
AT+FRH=3	NO CARRIER	detect loss-of-carrier	drop carrier
AT+FRH=3	CONNECT	send V.21 carrier	detect carrier	Final frame bit clear tells
		send flags	detect flags	the modem to expect
<TSI frame data>		send TSI frame	get TSI frame	another frame.
	CONNECT	send FCS		Final frame bit set tells
<DLE><ETX>		send flags		the modem not to
<DCS frame data>		send DCS frame	get DCS frame	expect another frame
	OK	send FCS, flags
<DLE><ETX>		drop carrier
AT+FTS=8;	CONNECT	wait 80 ms	detect carrier
+FTM=96		send V.29 carrier
<TCF data pattern>	OK	send TCF data	get TCF data
<DLE><ETX>		drop carrier
AT+FRH=3	CONNECT	detect carrier	send V.21 carrier
		detect flags	send flags
	<CFR frame data>	get CFR frame	get CRF frame	Final frame bit set.
	<DLE><ETX>	check FCS	send FCS	frame OK
	OK	accept FCS
AT+FRH=3	NO CARRIER	detect loss-of-carrier	drop carrier
AT+FTM=96	CONNECT	send V.29 carrier	detect carrier
<page image data>		send page data	receive page
<DLE><ETX>	OK	drop carrier
AT+FTS=8;		wait 80 ms	detect carrier
+FRH=3		send V.21 carrier
	CONNECT	send flags	detect flags
<EOP frame data>		send EOP frame	receives EOP
	OK	send FCS		final frame
<DLE><ETX>		drop carrier
AT+FRH=3	CONNECT	detect carrier	send V.21 carrier
		detect flags	send flags
	<MCF frame data>	get MCF frame	get MCF frame	Final frame bit set.
	<DLE><ETX>	check FCS	send FCS	frame OK
	OK	accept FCS
AT+FRH=3	NO CARRIER	detect loss-of-carrier	drop carrier
AT+FRH=3	CONNECT	send V.21 carrier	detect carrier
<DNC frame>		send flags
		send DNC frame	detect flags
<DLE><ETX>	OK	send FCS	receive DCNC	final frame
		drop carrier
ATH0	OK	hang up	hang up

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 98