Method and device for data communication

Details Method and device for data communication Method and device for data communication

1982-12-28

1986-07-22

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

178 3, H04Q 900, H04N 1500

Patent

active

046022520

ABSTRACT:
A method for data communication usable for a system having a common transmission line, a plurality of transceivers connected to the common transmission line, and a data processing equipment connected to each of the transceivers, the system being arranged such that data from the data processing equipment is sent to the common transmission line through the corresponding transceiver, while data from the common transmission line is sent to the data processing equipment through the corresponding transceiver, thereby effecting a data communication between data processing equipment, wherein when a request to send data is sent from the data processing equipment to the corresponding transceiver, a carrier signal is sent to the common transmission line, and when the fact that no data is sent from any of the other transceivers to the common transmission line is detected during a given period of time after the sending of the carrier signal, the transceiver gives a permission to send data, to the corresponding data processing equipment, which then sends data on the permission. Also disclosed is a device for carrying out the above-mentioned method for data communication.

REFERENCES:
patent: 4234952 (1980-11-01), Gable et al.
patent: 4271507 (1981-06-01), Gable et al.
patent: 4292623 (1981-09-01), Eswaran et al.
patent: 4384363 (1983-05-01), Lipcon
patent: 4409592 (1983-10-01), Hunt
patent: 4432088 (1984-02-01), Frankel
patent: 4463351 (1984-07-01), Chiarottino
patent: 4466096 (1984-08-01), Heins et al.

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