Multi-user serial bus system

Details Multi-user serial bus system Multi-user serial bus system

1987-11-09

1990-10-09

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082551, 370 856, H04Q 130, H04Q 902

Patent

active

049623788

ABSTRACT:
A new, multi-user data communication system is presented which is inexpensive and does not require any hardware changes to the central processor/system host. The standard serial data input/output port of each terminal is adapted from the standard single-user configuration to a party line, multi-user configuration by the addition of a simple and inexpensive interface circuit within each terminal. After the interface circuits are installed, the terminals can be interconnected to each other and to the central processor/system host using standard serial cabling. The party line interface circuit allows each terminal to access the non-busy serial data bus on a first-come-first-served basis. An interference detector and interference handling circuit are provided also to prevent data errors in the event of a possible data collision.

REFERENCES:
patent: 4095045 (1978-06-01), Johnson et al.
patent: 4486750 (1984-12-01), Aoki
patent: 4723120 (1988-02-01), Petty, Jr.
patent: 4730250 (1988-03-01), Girard et al.
patent: 4771417 (1988-09-01), Maxwell et al.
EIA Standard, RS-422, Electronic Industries Association, Apr. 1975.
EIA Standard, RS-232-C, Electronic Industries Association, Aug. 1969.
G. E. Friend et al., "Understanding Data Communications", Texas Instruments Inc., 1984, pp. 2-18 and 4-13.

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