Electronic digital logic circuitry – Interface – Current driving
Patent
1996-03-26
1998-04-21
Westin, Edward P.
Electronic digital logic circuitry
Interface
Current driving
326 30, H03K 1716, H03K 190175
Patent
active
057421862
ABSTRACT:
The present invention provides the network configuration that enables the random change of slaves to serve as the master without affecting the circuit by an increased or decreased number of connected slaves in an asynchronous serial communication circuit network that connects the slaves, using the dispersion and branch system, with a three-wired circuit consisting of a signal ground wire and two signal lines. Master and slaves are connected to a three-wired circuit by providing both input and output circuits, and the branch devices are provided at the connection section between the aforementioned slaves and a three-wired circuit. Branch devices contain the first, second, and third output circuits consisting the OR circuits and the open collector circuits, as well as the first, second, and third input circuits that form pairs with these first, second, and third output circuits and that have been terminated by being connected to the electrical power by means of terminal resistor; and has a circuit configuration wherein the aforementioned first input circuit is connected with the first input terminal of the OR circuits in the aforementioned second and third output circuits, the first input terminal of the OR circuit in the aforementioned first output circuit and the second input terminal of the OR circuit in the aforementioned second output circuit are connected with the aforementioned third input circuit, and the second input terminal of the OR circuit in the aforementioned first output circuit and the second input terminal of the OR circuit in the aforementioned third output circuit are connected with the aforementioned second input circuit.
REFERENCES:
patent: 3694665 (1972-09-01), Belluche
patent: 5315175 (1994-05-01), Langner
patent: 5603039 (1997-02-01), Strevey
patent: 5604450 (1997-02-01), Borkar et al.
Meller Michael N.
Rosen Richard
Victor Company of Japan Ltd.
Westin Edward P.
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