Data communication system with timed access to link

Details Data communication system with timed access to link Data communication system with timed access to link

1983-06-15

1986-06-03

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

3408251, 370 85, H04Q 900, H04J 308

Patent

active

045932832

ABSTRACT:
In an on-line system composed of a high rank unit and a plurality of terminal units connected thereto, various causes may produce a time-out in one of the terminal units. When a data link for a terminal unit is not established in a prescribed time resulting in a time-out, the status of the communication line during the attempted data communication is analyzed by a circuit provided for discriminating the cause of the time-out. Using the result of analysis, it is determined whether time-out has resulted from a busy condition of the line so as to diminish undesired work attendant upon occurrence of the time-out as far as possible and for obtaining a system with a high operation rate.

REFERENCES:
patent: 4058681 (1977-11-01), Imaizumi et al.
patent: 4156112 (1979-05-01), Moreland
patent: 4354252 (1982-10-01), Lamb et al.

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