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Helmholz Modem 56k small/Modem 56k USB small
Hardware data flow control with the application (RTS):
Modem
RS232 Cable
RTS Line
Application
(E.g.: PC or control)
The application sets the RTS line to OFF to request from the modem
to interrupt the data transmission.
It will depend on the according application software if the RTS/CTS
lines can be operated.
The application sets the RTS line to ON to request data from the mo-
dem.
5.2.5
Software data flow control XON and XOFF
Modem
Send data
XON or XOFF character
Application
(E.g.: PC or
control)
When the input buffer of the modem exceeds a certain fill state, the
modem will insert an XOFF character into the data stream to the appli-
cation. This character will cause the application to send no more data.
It will depend on the according application software if the RTS/CTS
data flow control is supported.
After the modem has processed the input buffer so far, it will insert a
XON character into the data stream. This character will cause the appli-
cation to send data to the modem again. Analogously, the applicaiton
can control the data stream from the modem to the application.
The XON/XOFF method is only available when the transmitted data do
not contain the characters XON or XOFF, which usually appear only in
actual ASCII texts (7 bit). When binary data (programs, …) are transmit-
ted, also for BTX operation or in the XMODEM transmission protocol,
for example, occasionally appearing XON or XOFF characters would dis-
turb the operation.
AT&K
AT&R
AT&K4
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