Chapter 2 – Fax Class 1 and 1.0 Commands

Examples

Examples of calling (transmitting) and answering (receiving) one page using Fax Class 1 commands are shown in Table 3-4 and Table 3-5, 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 3-4. 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

 

 

 

 

send TSI frame

 

get TSI frame

 

another frame.

<TSI frame data>

 

CONNECT

 

send FCS

 

 

 

Final frame bit set tells

<DLE><ETX>

 

 

send flags

 

 

 

the modem not to

 

 

 

 

send DCS frame

 

get DCS frame

 

expect another frame

<DCS frame data>

 

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>

 

 

 

drop carrier

 

 

 

 

 

 

OK

 

 

 

 

 

 

AT+FTS=8;

 

 

 

wait 80 ms

 

detect carrier

 

 

+FRH=3

 

 

 

send V.21 carrier

 

 

 

 

 

 

 

send flags

 

detect flags

 

 

 

 

CONNECT

 

send EOP frame

 

receives EOP

 

 

<EOP frame data>

 

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

 

 

 

 

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C)

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Multi-Tech Systems MT5634SMI V.34, MT5634SMI V.92 manual Examples, Fax Class 1 Calling Sequence Transmitting a Single

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