Multi-Tech Systems MT5600SMI-XL92, MT5600SMI-92 Fax Class 1 Answering Sequence Receiving a Single

Chapter 6 – Fax Class 1 and Class 1.0 Commands

Table 6-5. Fax Class 1 Answering Sequence (Receiving a Single Page)

DTE Commands	Modem Responses	Local Modem Action	Remote Station Action	Notes
AT+FCLASS=1	OK	Set Class 1
	RING<-	detect ringing	dials [,send CNG]
ATA		off-hook,		AT+FRH=3
		send CED,	get CED,	implied by answering
	CONNECT	send V.21 carrier	detect carrier	with +FCLASS=1.0.
		send flags	detect flags	not final frame
<CSI frame data>	CONNECT	send CSI frame	receive CSI
<DLE><ETX>		send FCS	get FCS
		send flags	get flags
<DIS frame data>	OK	send DIS data	get DIS
<DLE><ETX>		send FCS and flags	get flags	final frame
		drop carrier
AT+FRH=3	CONNECT	detect carrier	send V.21 carrier
		detect flags	send flags
	<TSI frame data>	receive TSI	send TSI frame
	<DLE><ETX>	receive FCS	send FCS
	OK	accept FCS		frame OK
AT+FRH=3	CONNECT	receive DCS	send DCS frame	final frame bit set
	<DCS frame data>	receive FCS	send FCS
	<DLE><ETX>	accept FCS		frame OK
	OK
AT+FRH=3	NO CARRIER	detect loss-of-carrier	drop carrier	DTE did not check final
				frame bit and issued
				+FRH=3
AT+FTM=96	CONNECT	detect carrier	wait 75 ms
			send V.29 carrier
	<TCF data>	receive TCF	send TCF data
	<DLE><ETX>	detect loss-of-carrier	drop carrier
	OK
AT+FRH=3	CONNECT	send V.21 carrier	detect carrier
		send flags	detect flags
		get CRF frame	receive CFR
<CFR frame data>		send FCS
		drop carrier
<DLE><ETX>	OK			final frame
AT+FTM=96	CONNECT	detect carrier	send V.29 carrier
	<page image data>	receive page	send page data
	<DLE><ETX>	detect loss-of-carrier	drop carrier
	NO CARRIER
	CONNECT	detect carrier	wait 75 ms
			send V.21 carrier
	<EOP frame data>	detect flags	send flags
	<DLE><ETX>	receive EOP	send EOP frame
	NO CARRIER	receive FCS	send FCS	frame OK
		accept FCS
AT+FRH=3	NO CARRIER	detect loss-of-carrier	drop carrier
AT+FRH=3	CONNECT	send V.21 carrier	detect carrier
<MCFame data>		send flags	detect flags
		get MCF frame	receive MCF frame
<DLE><ETX>		send FCS
		accept FCS
	OK			final frame
AT+FRH=3	CONNECT	detect carrier	send V.21 carrier
		detect flags	send flags
	<DCN frame data>	receive DCN	send DCN frame
	<DLE><ETX>	receive FCS	send FCS
	OK	accept FCS		frame OK
AT+FRH=3	NO CARRIER	detect loss-of-carrier	drop carrier	end of session
ATH0	OK	hang up

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 99