JPS54161205A - Polling system of transmission system - Google Patents

Polling system of transmission system

Info

Publication number
JPS54161205A
JPS54161205A JP7017978A JP7017978A JPS54161205A JP S54161205 A JPS54161205 A JP S54161205A JP 7017978 A JP7017978 A JP 7017978A JP 7017978 A JP7017978 A JP 7017978A JP S54161205 A JPS54161205 A JP S54161205A
Authority
JP
Japan
Prior art keywords
transmission line
polling
station
slave
word
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
JP7017978A
Other languages
Japanese (ja)
Inventor
Shuji Hisanaga
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 JP7017978A priority Critical patent/JPS54161205A/en
Publication of JPS54161205A publication Critical patent/JPS54161205A/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]
    • H04L12/42—Loop networks
    • H04L12/423—Loop networks with centralised control, e.g. polling

Abstract

PURPOSE:To enable each slave station to use a transmission line impartially by making it possible to start polling operation from any slave station series-connected in a loop. CONSTITUTION:While the master station is communicating with one of slave stations connected in series, its discrimination number is held by slave-station number register 106 via transmission line 3-n. For the purpose of polling after the communication, an instruction word instructing the transmission of a polling word is sent out from instruction-word register 107 under the control of control circuit 101. On receiving the instruction word from series transmission line (i) at the input side, the slave station equivalent to the number reads out the polling word from register 205 and sends out it to output-side transmission line (0), and the following slave station confirms that polling is in process and obtain the right of using the transmission line by priority, so that when any slave station makes a request to use against the master station, the master station will connect to the slave station via the transmission line.
JP7017978A 1978-06-09 1978-06-09 Polling system of transmission system Pending JPS54161205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7017978A JPS54161205A (en) 1978-06-09 1978-06-09 Polling system of transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7017978A JPS54161205A (en) 1978-06-09 1978-06-09 Polling system of transmission system

Publications (1)

Publication Number Publication Date
JPS54161205A true JPS54161205A (en) 1979-12-20

Family

ID=13424035

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7017978A Pending JPS54161205A (en) 1978-06-09 1978-06-09 Polling system of transmission system

Country Status (1)

Country Link
JP (1) JPS54161205A (en)

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