US 4,058,681 AGranted

Information transmission system

AssigneeFuji Electric Co., Ltd.

InventorsYoshihiro Imaizumi, Yoshihiko Nishida

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Abstract

An information transmission network in which a plurality of information processing stations are connected in parallel to a bus line is disclosed. Each station has a communication control means and an information processor. Each control means is capable of establishing command over the bus line to the exclusion of all other stations. While command is established, the commanding station can communicate with all other stations. After one sequence of communication, command is transferred. If the station presently in command fails, the failure to transfer command in a predetermined time will be noted and another station with highest priority will assume command. If the station to which command is transferred is not operating properly, the station presently in command will detect a failure of the former station to respond to transfer of command and will thereupon transfer command to another station.

Claims4

Dependent claims

In an information transmission network of the type comprising a plurality of information processing stations, each having a communications control means and an information processor, linked together by their parallel connection to an information bus line, a method of establishing orderly command over the utilization of said bus line without a special line controlling station, said method comprising,

a. establishing at a given station i command over the use of the bus line,
b. transmitting to said bus line from said given station i a command established signal ELS indicating that command is established and that said given station i has command,
c. receiving at all other stations said command established signal ELS,
d. communicating data between said given station i and any other station via said bus line,
e. after said communication or where no communication is required by station i, relinquishing command and sending a transfer command signal SEL having a selected address m attached thereto to said bus line,
f. receiving at all stations said transfer command signal SEL, and at the station having address m establishng command over the bus line, and
g. repeating steps (b) thru (e) with station m being the command station, whereby command is continuously transferred from one station to the nest to give all stations command of the bus line consecutively.

4 more elements

Dependencies are inferred from the claim text.