JPS57212849A - Polling transmission system - Google Patents

Polling transmission system

Info

Publication number
JPS57212849A
JPS57212849A JP9884481A JP9884481A JPS57212849A JP S57212849 A JPS57212849 A JP S57212849A JP 9884481 A JP9884481 A JP 9884481A JP 9884481 A JP9884481 A JP 9884481A JP S57212849 A JPS57212849 A JP S57212849A
Authority
JP
Japan
Prior art keywords
polling
data
terminal devices
cpu2
interruption
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.)
Pending
Application number
JP9884481A
Other languages
Japanese (ja)
Inventor
Masazumi Ichihashi
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.)
Omron Corp
Original Assignee
Tateisi Electronics Co
Omron Tateisi Electronics Co
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 Tateisi Electronics Co, Omron Tateisi Electronics Co filed Critical Tateisi Electronics Co
Priority to JP9884481A priority Critical patent/JPS57212849A/en
Publication of JPS57212849A publication Critical patent/JPS57212849A/en
Pending 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
    • G06F13/22—Handling requests for interconnection or transfer for access to input/output bus using successive scanning, e.g. polling

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To prevent a vacant polling and to reduce ineffective interruption, by utilizing a CPU which makes polling to each terminal polling data exists sequentially and automatically and accomplishes the polling only when no polling exists at all terminals. CONSTITUTION:A CPU2 discriminate if a polling start command is given and when given, a communication control unit (CCU)8 discriminates if terminal devices 15a-30h have polling data. If the terminal devices 15a-30h have the polling data, the data is transmitted from the terminal device to the CPU2 and generates the interruption of presence of the polling data. If no polling data exists in the terminal devices 15a-30h, all the terminal devices 15a- 30h are subjected to polling and the interruption of absence of polling data is generated to the CPU2 when polling of the terminal devices 15a-30h is accomplished.
JP9884481A 1981-06-24 1981-06-24 Polling transmission system Pending JPS57212849A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9884481A JPS57212849A (en) 1981-06-24 1981-06-24 Polling transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9884481A JPS57212849A (en) 1981-06-24 1981-06-24 Polling transmission system

Publications (1)

Publication Number Publication Date
JPS57212849A true JPS57212849A (en) 1982-12-27

Family

ID=14230551

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9884481A Pending JPS57212849A (en) 1981-06-24 1981-06-24 Polling transmission system

Country Status (1)

Country Link
JP (1) JPS57212849A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59181853A (en) * 1983-03-31 1984-10-16 Fujitsu Ltd Data transmission system
JPS6054548A (en) * 1983-09-05 1985-03-29 Fujitsu Denso Ltd Data transmission system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5463636A (en) * 1977-10-28 1979-05-22 Fujitsu Ltd Communication processing system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5463636A (en) * 1977-10-28 1979-05-22 Fujitsu Ltd Communication processing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59181853A (en) * 1983-03-31 1984-10-16 Fujitsu Ltd Data transmission system
JPH0345945B2 (en) * 1983-03-31 1991-07-12 Fujitsu Ltd
JPS6054548A (en) * 1983-09-05 1985-03-29 Fujitsu Denso Ltd Data transmission system

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