Product data

USRobotics
Command Reference
Fax Class 1 and Fax Class 1.0 Commands - 125
Response: +FLO: (<method>range)
Example: +FLO: (0-2)
Result Codes
OK <method> = 0-2.
ERROR Otherwise.
Examples
Examples of calling (transmitting) and answering (receiving) one page using fax
class 1 commands are shown in Table 5-4. 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 (e.g., AT+FRH=3) and comments are in lower case. All streams of data
denoted by <..frame> are terminated by the <DLE><ETX> characters.
Table 5-4: 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 <CSI
frame data>
<DLE><ETX>
<DIS frame
data>
<DLE><ETX>
CONNECT
CONNECT OK
off-hook, send CED, send
V.21 carrier send flags
send CSI frame send FCS
send flags send DIS data
send FCS and flags drop
carrier
get CED, detect carrier
detect flags receive CSI
get FCS get flags get DIS
get flags
AT+FRH=3 implied
by answering with
+FCLASS=1.0. not
final frame final
frame
AT+FRH=3 CONNECT
<TSI frame
data>
<DLE><ETX>
OK
detect carrier detect flags
receive TSI receive FCS
accept FCS
send V.21 carrier send
flags send TSI frame
send FCS
frame OK
AT+FRH=3 CONNECT
<DCS frame
data>
<DLE><ETX>
OK
receive DCS receive FCS
accept FCS
send DCS frame send
FCS
final frame bit set
frame OK
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier DTE did not check
final frame bit and
issued +FRH=3