JPS56143742A - Terminal starting system - Google Patents

Terminal starting system

Info

Publication number
JPS56143742A
JPS56143742A JP4767780A JP4767780A JPS56143742A JP S56143742 A JPS56143742 A JP S56143742A JP 4767780 A JP4767780 A JP 4767780A JP 4767780 A JP4767780 A JP 4767780A JP S56143742 A JPS56143742 A JP S56143742A
Authority
JP
Japan
Prior art keywords
center
terminal device
input data
signal
center side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP4767780A
Other languages
Japanese (ja)
Other versions
JPS6355260B2 (en
Inventor
Kazuhito Saito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP4767780A priority Critical patent/JPS56143742A/en
Publication of JPS56143742A publication Critical patent/JPS56143742A/en
Publication of JPS6355260B2 publication Critical patent/JPS6355260B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
    • G06F13/24—Handling requests for interconnection or transfer for access to input/output bus using interrupt

Abstract

PURPOSE:To eliminate the need to provide a transmission line only for interrupts and to improve the efficiency of utilization of a center by informing the center of the occurrence of abnormality at a terminal device by holding input data at the high level, and by detecting the signal at the center side to select the terminal device. CONSTITUTION:Many terminal devices 10 and center 20 are connected together via two transmission lines L1 and L2. Input data to terminal device 10 is normally at the high level and, for example, if data d2 changes, OR circuit 13 generates a high- level output to turn on transistor Tr2, outputting an interruption signal. This signal flows from power source E by way of diode D1, transmission line L1 and photocoupler PC2 at the center side to turn on the phototransistor of photocoupler PC2 at the center side, thereby informing center 20 of the occurrence of the interruption of terminal device 10. Then, the center selects terminal device 10 and discriminates the change of input data d2.
JP4767780A 1980-04-10 1980-04-10 Terminal starting system Granted JPS56143742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4767780A JPS56143742A (en) 1980-04-10 1980-04-10 Terminal starting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4767780A JPS56143742A (en) 1980-04-10 1980-04-10 Terminal starting system

Publications (2)

Publication Number Publication Date
JPS56143742A true JPS56143742A (en) 1981-11-09
JPS6355260B2 JPS6355260B2 (en) 1988-11-01

Family

ID=12781900

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4767780A Granted JPS56143742A (en) 1980-04-10 1980-04-10 Terminal starting system

Country Status (1)

Country Link
JP (1) JPS56143742A (en)

Also Published As

Publication number Publication date
JPS6355260B2 (en) 1988-11-01

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