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JPS56128049A - Data communication system - Google Patents

Data communication system

Info

Publication number
JPS56128049A
JPS56128049A JP3194580A JP3194580A JPS56128049A JP S56128049 A JPS56128049 A JP S56128049A JP 3194580 A JP3194580 A JP 3194580A JP 3194580 A JP3194580 A JP 3194580A JP S56128049 A JPS56128049 A JP S56128049A
Authority
JP
Japan
Prior art keywords
data
station
slave station
polling
polling pulse
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
JP3194580A
Other languages
Japanese (ja)
Inventor
Joji Onto
Shoichi Nagai
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3194580A priority Critical patent/JPS56128049A/en
Publication of JPS56128049A publication Critical patent/JPS56128049A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/403—Bus networks with centralised control, e.g. polling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To greatly simplify a transmission control procedure at a physical level, by sending out a polling pulse to a slave station from a master station at every constant period, by means of a polling pulse control line provided on every slave station. CONSTITUTION:In case when a data is transmitted to a slave station (b) from a master station (a), at first, a polling pulse is sent out to the slave station (b) at every constant period, and after sending out the polling pulse, a send-out data d1 is sent out, the master station (a) becomes a receiving mode at the time of the next polling period, a data d2 is received from the slave station (b), and the next operation is started at the next polling period. Subsequently, in case when a data is transmitted to the main station (a) from the slave station (b), the slave station becomes a transmission mode after receiving the polling pulse, sends out a data d1 to the master station (a), becomes a receiving mode at the time of receiving the next polling pulse, and receives a data d2 from the master station (a).
JP3194580A 1980-03-13 1980-03-13 Data communication system Pending JPS56128049A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3194580A JPS56128049A (en) 1980-03-13 1980-03-13 Data communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3194580A JPS56128049A (en) 1980-03-13 1980-03-13 Data communication system

Publications (1)

Publication Number Publication Date
JPS56128049A true JPS56128049A (en) 1981-10-07

Family

ID=12345095

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3194580A Pending JPS56128049A (en) 1980-03-13 1980-03-13 Data communication system

Country Status (1)

Country Link
JP (1) JPS56128049A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10508715A (en) * 1994-11-03 1998-08-25 パラメトリック テクノロジー コーポレーション Computer graphic modeling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10508715A (en) * 1994-11-03 1998-08-25 パラメトリック テクノロジー コーポレーション Computer graphic modeling system

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