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A method is described which provides automatic pacing support by the asynchronous communications devices and does not prevent applications from using special characters as signalling mechanisms.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
70% of the total text.
Page 1 of 1
Application-based And Automatic Pacing Support
A method is described which provides automatic pacing support by the
asynchronous communications devices and does not prevent applications from
using special characters as signalling mechanisms.
The de-facto industry standard/tradition is to allow for automatic support of
Start/Stop transmission indicators (often defaulted to ASCII DC1 and DC3 and
referred to as XON and XOFF, respectively) within the firmware, whthout
application involvement. This approach also prevents the applications from
having the flexibility of responding to special characters (of which XON and
XOFF are special cases) and of defining the buffer thresholds for the automatic
pacing mode. Therefore, flexibility and application-based special character
processing are needed in the unarchitected world of asynchronous
The flexibility problem is solved by the new method by allowing application-
defined special character (which may contain variable significant data bits) to be
used. This feature allows for flexibility in the diverse and unarchitected world of
asynchronous communications. Furthermore, applications may also define the
buffer thresholds, which when reached, trigger the automatic transmission of
The problem that applications are prevented from handling
special characters for input and output is solved by a mechanism to
allow applications to be involved directly. Note that the character
may be imbed...