Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1978-01-18
1979-12-11
Richardson, Robert L.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
178 58A, 250551, H04B 900
Patent
active
041785045
ABSTRACT:
Balancing of a "transmit" line and a "receive" line, which make up a half-duplex serial transmission line, is accomplished, where a first optical isolator is utilized to drive an electrical current signal over the "transmit" line and a second optical isolator is utilized to receive electrical current signals from the "receive" line, by adding a third optical isolator to the circuit. The third optical isolator is in an on condition when the first optical isolator is in an on condition and is in an off condition when the first optical isolator is in an off condition. The third optical isolator is used to make the "receive" and "transmit" lines both see a "signal ground", at the ends thereof connected to the first and second optical isolators, when current is flowing in the "transmit" line. The third optical isolator is used to make the "receive" and "transmit" lines both see the same resistive element, at the ends thereof connected to the first and second optical isolators, when no current is flowing in the "transmit" line. In this manner, a balanced transmission line is insured under all circumstances.
REFERENCES:
patent: 3497619 (1970-02-01), Babcock
patent: 3725582 (1973-04-01), Davis
patent: 3843834 (1974-10-01), Burke
patent: 3975712 (1976-08-01), Hepworth et al.
patent: 4024501 (1977-05-01), Herring et al.
patent: 4052702 (1977-10-01), Smith et al.
Peatman-Microcomputer Based Design-McGraw Hill, 1977, pp. 331, 332, 288-299, 214-219, 272-273.
Soucek et al.-Microprocessors and Microcomputers-John Wiley & Sons, Inc. 1976, pp. 212-214.
Orsino Jr. Joseph A.
Phillips Petroleum Company
Richardson Robert L.
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