Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1988-09-09
1990-05-15
Olms, Douglas W.
Pulse or digital communications
Spread spectrum
Direct sequence
370 84, H04L 2300
Patent
active
049264486
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.
REFERENCES:
patent: 4001504 (1977-01-01), Hendrickson
patent: 4387440 (1983-06-01), Eaton
patent: 4440988 (1984-04-01), Heatherington
patent: 4504802 (1985-03-01), Heatherington
patent: 4549302 (1985-10-01), Heatherington
patent: 4644563 (1987-02-01), Ohishi et al.
patent: 4727370 (1988-02-01), Shih
Cox Stuart A.
Kraul Douglas R.
Chin Stephen
Hayes Microcomputer Products, Inc.
Olms Douglas W.
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