Software Data Flow Control (Xon/Xoff) - INSYS 56k Small INT 2.0 Manual Manual

INSYS Modem 56k Small INT 2.0
The data flow control with RTS/CTS behavior is active by default.
Configuration with HSComm
Select the type of data flow control or switch it off completely on the tab Mo-
dem in the panel "Handshake" (Page 27, Figure 5: HSComm Modem - Tab Mo-
dem, Position 26).
Configuration with AT commands
To switch the data flow control on and to set
the type to RTS/CTS, use:
To switch the data flow control off, use:
12.5.2

Software data flow control (XON/XOFF)

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 application. This character will cause the
application to send no more data. It will depend on the according application software if
the XON/XOFF data flow control is supported.
After the input buffer of the modem is emptied so much that data can be received again,
the modem will send an XON character to the application. This character will cause the
application to send data to the modem again. Analogously, the application can insert
XON/XOFF characters into the data stream to switch the data flow on and off. The
XON/XOFF data flow control 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, etc.) are transmitted, or in the XMODEM transmission protocol,
for example, occasionally appearing XON or XOFF characters would disturb the opera-
tion.
Configuration with HSComm
Select the type of data flow control or switch it off completely on the tab Mo-
dem in the panel "Handshake" (Page 27, Figure 5: HSComm Modem - Tab Mo-
dem, Position 26).
Configuration with AT commands
To switch the data flow control on and to set
the type to XON/XOFF, use:
To switch the data flow control off, use:
AT&K3
AT&K0
AT&K4
AT&K0
Functions
33