Comtrol AT Commands - Manual (Page 174)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Conexant 102184B
4-20
Table 4-4. 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
CONNECT
OK
Dial and send CNG
Look for V.21
Detect flags Answer
send CED, V.21
Send HDLC flags
Send NSF frame
AT+FRH=3
implied by dialing with
+FCLASS=1.0
AT+FRH=3
CONNECT
OK
Detect flags
get CSI
get FCS
accept FCS
send CSI frame
check FCS
Frame status OK
AT+FRH=3
CONNECT
OK
Detect flags
get DIS
get FCS
accept FCS
send DIS frame
check FCS
DTE must detect final
frame bit to anticipate
loss of carrier
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier
AT+FRH=3
CONNECT
CONNECT
OK send V.21 carrier
send flags
send TSI frame
send FCS
send flags
send DCS frame
send FCS, flags
drop carrier detect carrier
detect flags
get TSI frame
get DCS frame Final frame bit clear tells
the modem to expect
another frame.
Final frame bit set tells the
modem not to expect
another frame
AT+FTS=8;
+FTM=96
CONNECT
OK wait 80 ms
send V.29 carrier
send TCF data
drop carrier
detect carrier
get TCF data
AT+FRH=3
CONNECT
OK
detect carrier
detect flags
get CFR frame
check FCS
accept FCS send V.21 carrier
send flags
get CRF frame
send FCS
Final frame bit set.
frame OK
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier
AT+FTM=96
CONNECT
OK send V.29 carrier
send page data
drop carrier detect carrier
receive page
AT+FTS=8;
+FRH=3
CONNECT
OK wait 80 ms
send V.21 carrier
send flags
send EOP frame
send FCS
drop carrier
detect carrier
detect flags
receives EOP
final frame
AT+FRH=3
CONNECT
OK
detect carrier
detect flags
get MCF frame
check FCS
accept FCS send V.21 carrier
send flags
get MCF frame
send FCS
Final frame bit set.
frame OK
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier
AT+FRH=3
CONNECT
OK send V.21 carrier
send flags
send DNC frame
send FCS
drop carrier
detect carrier
detect flags
receive DC|NC
final frame
ATH0 OK hang up hang up