JPS56115057A - Data communication system - Google Patents
Data communication systemInfo
- Publication number
- JPS56115057A JPS56115057A JP1726280A JP1726280A JPS56115057A JP S56115057 A JPS56115057 A JP S56115057A JP 1726280 A JP1726280 A JP 1726280A JP 1726280 A JP1726280 A JP 1726280A JP S56115057 A JPS56115057 A JP S56115057A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- data
- polling
- transmission
- sends
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Communication Control (AREA)
- Small-Scale Networks (AREA)
Abstract
PURPOSE:To prevent an increment of traffic for the trunk circuit and at the same time secure a normal communication even when a transmission delay occurs, by using the polling signal and the closure signal between the main terminal and the subordinate terminal of the polling system. CONSTITUTION:In a communication cycle during which the send-back of data complets from the subordinate terminals TD1-TDn selected by the polling signal P and after a start of transmission of signal P through the main terminal TM, the repeating device RM transmits the P indication signal that indicates a transmission of signal P to TD to the repeating device RD when the first P signal is received from TM, and then sends the closure signal E back to TM. After this, the signal E is transmitted to TM when a coincidence is obtained between the subsequent P signal and the preceding P signal and in case the data is not received and accumulated from the selected TD, and the data is sent to TM during accumulation. On the other hand, RD transmits the signal P repetitively when receiving the signal S from TD and then sends the data, if receives, to RM.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1726280A JPS56115057A (en) | 1980-02-15 | 1980-02-15 | Data communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1726280A JPS56115057A (en) | 1980-02-15 | 1980-02-15 | Data communication system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56115057A true JPS56115057A (en) | 1981-09-10 |
JPS6239577B2 JPS6239577B2 (en) | 1987-08-24 |
Family
ID=11939046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1726280A Granted JPS56115057A (en) | 1980-02-15 | 1980-02-15 | Data communication system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56115057A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61244149A (en) * | 1985-04-22 | 1986-10-30 | Nec Corp | Data transmission system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54142902A (en) * | 1978-04-28 | 1979-11-07 | Hitachi Ltd | Communication system using polling emulator |
-
1980
- 1980-02-15 JP JP1726280A patent/JPS56115057A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54142902A (en) * | 1978-04-28 | 1979-11-07 | Hitachi Ltd | Communication system using polling emulator |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61244149A (en) * | 1985-04-22 | 1986-10-30 | Nec Corp | Data transmission system |
Also Published As
Publication number | Publication date |
---|---|
JPS6239577B2 (en) | 1987-08-24 |
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