Flow Control - ZyXEL Communications 2864 Series User Manual

This message includes the connection speed and the fax parameters.
Snnnn
Vn
Tn
Rn
Ln
Cn
P<string>
After each fax disconnection, the following result code is sent back to the DTE:
DISCONNECTnP<string>
This result code informs the DTE of the disconnecting status.
DISCONNECT0
DISCONNECT1
P<string>
The basic AT commands ATV0 and ATQ1 do not affect the above CONNECT and
DISCONNECT status report result codes. The modem will always return the same
status format as above.

Flow Control

In extended fax AT command mode, the modem always uses hardware (CTS/RTS)
flow control. The flow control signaling used while sending a fax is:
CTS is used by the modem 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 modem that the fax message is fin-
ished. As soon as RTS off is detected, the modem starts the post message hand-
shaking 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 mes-
sage 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.
Fax connection speed; nnnn is a 4-digit number representing
the connection speed. nnnn =1440, 1200, 9600, 7200,
etc., whereby 1440 and 1200 stand for 14400 and 12000.
Vertical resolution; n = 0 or 1.
Coding scheme; n = 0 or 1.
Recording width; n = 0, 1, or 2.
Recording length; n = 0, 1, or 2.
Scan line time; n = 0 to 7.
Remote fax number.
Disconnects with remote confirmation.
Disconnects without remote confirmation.
Remote fax number.
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