Communications: electrical – Continuously variable indicating – With meter reading
Patent
1986-06-06
1987-11-17
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
With meter reading
34082508, 34082554, H04Q 100
Patent
active
047076941
ABSTRACT:
There is disclosed a port communication method and apparatus for controlling system controller communications with port circuits of the system. The port communication apparatus generates commands to port module interfaces, interposed between the controller and port circuits, in a predetermined order and receives acknowledgement signals therefrom. Thereafter, the port interfaces concurrently collect data from the associated port circuits and transmit this data in response to a subsequent read command from the port communication apparatus. In one embodiment the port communication apparatus includes a programmable microcode routine which generates the commands using input parameters which are specified in various registers and in the microcode program call.
REFERENCES:
patent: 3702008 (1972-10-01), Groth
patent: 4010452 (1977-03-01), Cazanove
patent: 4149144 (1979-04-01), Diefenderfer
patent: 4173754 (1979-11-01), Feiker
patent: 4306287 (1981-12-01), Huang
patent: 4539676 (1985-09-01), Lucas
patent: 4546468 (1985-10-01), Christmas et al.
"Minicomputer Systems Structure, Implementation, and Application" Cay Weitzman, pp. 66-70.
Bauer David L.
Bowyer Larry D.
Ruby David M.
Windhausen Richard A.
American Telephone and Telegraph Company
AT&T Information Systems Inc.
Caccuro John A.
Weldon Ulysses
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