ZyXEL U-336R User Guide - Page 99

Flow Control

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After each fax disconnection, the following result code is sent back to the DTE: DISCONNECTnP This result code informs DTE of the disconnecting status. Field DISCONNECT0 DISCONNECT1 P Description Disconnect with remote confirmation. Disconnect without remote confirmation. Remote fax number. 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 U-336S/SA always uses hardware (CTS/RTS) flow control. The flow control signaling used sending a fax is: • CTS is used by your modem for DTE flow control. 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 your modem 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 Fax Operation 85

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Fax Operation
85
After each fax disconnection, the following result code is sent back to
the DTE:
DISCONNECTnP<string>
This result code informs DTE of the disconnecting status.
Field
Description
DISCONNECT0
Disconnect with remote confirmation.
DISCONNECT1
Disconnect without remote confirmation.
P<string>
Remote fax number.
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 U-336S/SA always uses
hardware (CTS/RTS) flow control. The flow control signaling used
sending a fax is:
•
CTS is used by your modem for DTE flow control. 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 your modem 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