Bus coupling circuit

Details Bus coupling circuit Bus coupling circuit

1989-10-17

1991-01-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

307270, H04B 300, H04L 2500

Patent

active

049859030

ABSTRACT:
A bus coupling circuit couples data between a transmitting subscriber and a receiving subscriber using a data transfer bus. Each subscriber includes a bidirectional driver for transmitting and receiving data. Each bidirectional driver includes an apparatus for reintroducing a direct voltage at the bus-sided input of each driver, and a direct voltage splitting device connected between the driver and the bus. Each driver has an input/output port. A hysteresis circuit is connected to each driver and includes a voltage divider disposed between the an input of the driver and a source of supply voltage. The voltage divider has a divider tap to provide a direct supply voltage at the driver, and includes first and second voltage divider resistors, these resistors having respective resistance values R2x and R3x which satisfy the following relationship: ##EQU1## where x represents the sequential number of the respective subscriber, and n is the number of tolerable driver short circuits; whereby the bus is fault tolerant for a plurality n of driver short circuits.

REFERENCES:
patent: 3541239 (1970-11-01), Reid
patent: 3875332 (1975-04-01), Fletcher et al.
patent: 4445222 (1984-04-01), Smitt
"Regelungstechnische Praxis", [Regulatory Practice], vol. 25, 1983, No. 10, pp. S61-S64, and No. 10, pp. S69 and S70.
"Prinzipien digitaler Kippschaltungen", [Principles of Digital Trigger Circuits], by Von Edgar Baeger and Horst Bienert, published by Siemens Aktiengesellschaft, pp. 44-51.

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