Extended Fax At Command Set - ZyXEL Communications U-336S User Manual

Extended Fax AT Command Set

Extended Fax AT Commands are unique to ZyXEL modems. The
computer controls the modem through a set of extended fax AT
commands and the modem responds with a set of status report
result codes. During data state, compressed fax image data is
flowing between the modem and computer. The default serial
connection speed is 38400 bps, and it is higher than the fax link
rate. CTS/RTS hardware flow control is used to regulate the data
flow.
Your modem accepts the extended fax AT commands to set the
modem mode and fax parameters. Besides the extended fax AT
commands, the modem accepts all the other AT commands
described in this chapter. For instance, you can use ATD to make a
fax call, or ATA to answer an incoming fax call. When using the
extended Fax AT commands, you need to send the command
AT+FCLASS=6 first. Following are the fax related AT commands:
Mode Setting
Command Function
#F Set the modem into V17G3 FAX mode same
function as the extended AT command AT&N32.
#B0 Set fax receiving mode. The connection parameters
and received fax data are sent to DTE continuously
following the connect message. (Default)
#B1 Set fax receiving mode. The messages are separated
from the received fax data. The modem sends
CONNECT FAX and ZyXEL first, then it waits for
the DC2 character (hex18) to send the fax data.
When the modem receives a DC2 from the DTE, it
starts to send the fax connection
parameters/SnnnnVnTnRnLnCnP<string><CR><LF
> then the received fax data. In this mode, the
modem will wait for DC2 at the beginning of every
Fax Operation 79