Multiplex communications – Wide area network – Packet switching
Patent
1993-04-13
1995-02-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 31, 34082506, 307 101, H04L 514, H04J 314
Patent
active
053880919
ABSTRACT:
A communications system includes an electronic control apparatus having an asynchronous serial communications function and a test apparatus for checking the operation of the electronic control apparatus. The test apparatuses using different communications modes can be connected to a single electronic control apparatus. The test apparatus includes an identification signal generator for generating an identification signal identifying the full or half duplex communications mode of the specific test apparatus. The electronic control apparatus has both full and half duplex communications arrangements. Either the full or half duplex communications arrangement is selected according to the identification signal received from the test apparatus.
REFERENCES:
patent: 4599719 (1986-07-01), Breen et al.
patent: 4653044 (1987-03-01), Kudo
patent: 4897831 (1990-01-01), Negi et al.
patent: 5121382 (1992-06-01), Yang et al.
Data and Computer Communications, by William Stallings (Macmillan Publishing Company 1988).
M68HCll Reference Manual, published by Motorola, Inc. (1991), pp. 9-1 to 9-5.
Hsu Alpus H.
Olms Douglas W.
Sumitomo Electric Industries Ltd.
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