JPS57212849A - Polling transmission system - Google Patents
Polling transmission systemInfo
- 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
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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5463636A (en) * | 1977-10-28 | 1979-05-22 | Fujitsu Ltd | Communication processing system |
-
1981
- 1981-06-24 JP JP9884481A patent/JPS57212849A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5463636A (en) * | 1977-10-28 | 1979-05-22 | Fujitsu Ltd | Communication processing system |
Cited By (3)
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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