Method and apparatus for implementing an escape sequence
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United States of America Patent
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-
May 15, 1990
Issued Date -
N/A
app pub date -
Sep 9, 1988
filing date -
May 6, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-port message buffer which is responsive to an escape sequence. A control unit controls whether the message buffer is in a transparent mode or a command mode with respect to a particular port. The control unit monitors a data port for the escape sequence and, if the escape sequence is detected, the control unit causes the message buffer to enter into the command mode with respect to that port. The escape sequence is a break sequence of a predetermined period, followed within a predetermined time by a predetermined character at a predetermined data transmission speed. The escape sequence can therefore be detected even if the currently programmed data transmission speed for that particular port is unknown.
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