INSYS GSM 4.3 I4
Functions
41
11.6.2
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 "Basic
Settings" tab in the "Handshake" panel.
Configuration with AT commands
To switch the
data flow control
on and to set
the type to
XON/XOFF
, use
AT\Q1
To switch the
data flow control
off, use
AT\Q0
Summary of Contents for GSM 4.3 I4
Page 1: ...Manual INSYS GSM 4 3 I4 Dec 09 ...
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Page 77: ...INSYS GSM 4 3 I4 Index 77 Usage according to the regulations 6 Voice connection 46 ...
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