Title:
REMOTE INPUT/OUTPUT DEVICE
Document Type and Number:
Japanese Patent JP3390655
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To asynchronously perform the input/output operation of a remote control circuit by connecting an input terminal to an input/output control circuit in parallel and connecting an output terminal to the input/output control circuit by wired OR connection and performing the read or write access to the remote control circuit by the input/output control circuit connected to an external control device.
SOLUTION: When data is outputted from a controller 1 to a control device 15, data set by two remote control devices 2 are transmitted to two remote control circuits 5. This data is set to an output register 9 through a transmission/reception part 6. Though an input/output control circuit 13 simultaneously and periodically performs the read access to two remote control circuits 5, only one remote control circuit 5 to which a control signal 14 preliminarily gives priority outputs data. Output data 10 set to the output register of the remote control circuit 5 to which priority is given is read, and the output signal is outputted to the control device 15.
Inventors:
Yukihiro Murata
Hironori Nagashima
Yofumi Kurisu
Yasunori Nomoto
Masamitsu Kobayashi
Hironori Nagashima
Yofumi Kurisu
Yasunori Nomoto
Masamitsu Kobayashi
Application Number:
JP6646898A
Publication Date:
March 24, 2003
Filing Date:
March 17, 1998
Export Citation:
Assignee:
株式会社日立製作所
株式会社日立情報制御システム
株式会社日立情報制御システム
International Classes:
G06F13/00; H04L1/22; H04L5/14; H04Q9/00; (IPC1-7): H04Q9/00
Attorney, Agent or Firm:
Yasuo Sakuta (1 outside)
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