Filter
Top Products
Chapter 9 - Fax Operation
9-16
Flow Control
In extended fax AT command mode, the Omni 288S always uses hardware
(CTS/RTS) flow control. The flow control signaling used sending a fax is:
CTS is used by the Omni 288S to flow control the DTE. When the modem
turns CTS off, the buffer inside the modem is full and cannot accept any more
data. The computer should send data only when CTS is ON.
RTS is used by the computer to signal the Omni 288S that the fax message is
finished. As soon as RTS off is detected, the modem starts the post message
handshaking to make sure that the remote facsimile has received the fax
message successfully. Then it hangs up the phone and sends a status report to
the DTE.
If you want to send a multi-page fax, just add the RTC signal between the fax
message of two pages. The modem detects the RTC signal automatically,
handshakes the multi-page procedure with the remote facsimile and sends the next
page message.
The following flow control signaling is used while receiving a fax:
CTS is not used when receiving fax.
RTS is used to inform the Omni 288S that the computer cannot accept data at
this moment. The modem will not pass received data to the DTE if RTS is
turned off.
When finished receiving the fax message, the Omni 288S will turn off CD then
send a status report result code to the DTE.
Fax Reception from a BBS
The Omni 288S can automatically detect data and fax calls and allow BBS
software to receive faxes on the same phone line. To allow your BBS to receive
incoming faxes, make the following set-up changes in your BBS:
1. Add the string #B1+FCLASS=6 to the init string. Be sure the +FCLASS=6
command is the last command.
2. Change one of the messages in the list to CONNECT FAX.
3. Set the external mail string to ZyXEL and give it an error level.
4. In your BBS batch file, if the error level matches the external mail, execute
rcvfax 2 /p:comport [/w:workpath]
This setting will enable the BBS to receive a fax and store it automatically.
The following is a sample setting for the FrontDoor system.
Add these commands to the init string: