Circuit arrangement for serial data transmission between a plura

Details Circuit arrangement for serial data transmission between a plura Circuit arrangement for serial data transmission between a plura

1988-08-30

1990-02-20

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 36, 455 78, 3408255, H04B 144

Patent

active

049032801

ABSTRACT:
A circuit arrangement for serial data transmission between a plurality of subscriber stations via a data bus with transmitters that are high-impedance in the passive condition and low-impedance in the active condition is provided with a mutual control of the subscriber stations which occurs via the data bus without the assistance of additional control lines. This is achieved in that the leads of the data bus are each connected to a voltage source at at least one location via a resistor and in that at least one evaluation device for evaluating the voltages carried by the two leads is provided, the evaluation device outputting a busy signal given voltages of different magnitude at the leads of the data bus and outputting a free signal given identical voltages at the leads of the data bus. The circuit arrangement is particularly suitable for utilization in remote control devices.

REFERENCES:
patent: 4390990 (1983-06-01), Ainsworth
patent: 4476467 (1984-10-01), Terwilliger et al.
patent: 4627076 (1986-12-01), Staal et al.
patent: 4638311 (1987-01-01), Gerety
patent: 4652873 (1987-03-01), Dolsen et al.
"Data Transmission is Faster with Ternary Coding," Bruins, Electronics, vol. 47, No. 11, May 1974, pp. 119-120.
"RS422 and Beyond," Burgess, Electronic Engineering, vol. 53, No. 658, Oct. 1981, pp. 81-85.
"Line Drivers are not Limited to Computer Systems," Pippenger, Electrical Design News, vol. 17, No. 6, Mar. 1972, pp. 44-46.
"Bus--Faehige Schnittstelle nach RS 485/422," Abendroth, Elektronik, 12/15.6. 1984, pp. 97-98.
"Interface--Standard RS--485 Jetzt Praktisch Anwendbar," Elektronik, 6/23.3. 1984, p. 24.
Abendroth; Electronik; 12/15 Jun. 1984; pp. 97 and 98 (no translation).

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