JPS56149149A - Communication system of remote monitor system - Google Patents

Communication system of remote monitor system

Info

Publication number
JPS56149149A
JPS56149149A JP5245180A JP5245180A JPS56149149A JP S56149149 A JPS56149149 A JP S56149149A JP 5245180 A JP5245180 A JP 5245180A JP 5245180 A JP5245180 A JP 5245180A JP S56149149 A JPS56149149 A JP S56149149A
Authority
JP
Japan
Prior art keywords
equipment
data
transmission line
power
power failure
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
Application number
JP5245180A
Other languages
Japanese (ja)
Other versions
JPS639416B2 (en
Inventor
Hitoshi Aoyama
Takashi Kobori
Kazuyoshi Iijima
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 JP5245180A priority Critical patent/JPS56149149A/en
Publication of JPS56149149A publication Critical patent/JPS56149149A/en
Publication of JPS639416B2 publication Critical patent/JPS639416B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/44—Arrangements for feeding power to a repeater along the transmission line

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Small-Scale Networks (AREA)
  • Communication Control (AREA)
  • Selective Calling Equipment (AREA)

Abstract

PURPOSE:To prolong the time available for transmitting data during a power failure while reducing the capacity of a battery by connecting a center equipment and terminal equipment via the 1st to 3rd data lines and a couple of common lines and by stopping the supply of a communication current during the power failure. CONSTITUTION:Center equipment C and terminal equipment A are connected together via data transmission line L1 from side A to equipment side C, data transmission line L2 from equipment side C to equipment A, and common line E to transmission lines L1 and L2. Between transmission line L1 and communication line E, relay R1 for data reception and diode D1 for data detection are connected and between transmission line L2 and common line E, power sources V1 and V2 for data transmission are connected. Further, data transmitting relay contact t1 and power- source supply stopping relay contact p1 excluding a communication current in a power failure are connected in series to transmission line L2. Then, power failure detecting circuit 6 of equipment C detects a power failure and, after sending a power-failure detection signal to equipment A, stops the supply of the communication current via contact p1, reducing the capacities of power sources V1 and V2.
JP5245180A 1980-04-21 1980-04-21 Communication system of remote monitor system Granted JPS56149149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5245180A JPS56149149A (en) 1980-04-21 1980-04-21 Communication system of remote monitor system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5245180A JPS56149149A (en) 1980-04-21 1980-04-21 Communication system of remote monitor system

Publications (2)

Publication Number Publication Date
JPS56149149A true JPS56149149A (en) 1981-11-18
JPS639416B2 JPS639416B2 (en) 1988-02-29

Family

ID=12915082

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5245180A Granted JPS56149149A (en) 1980-04-21 1980-04-21 Communication system of remote monitor system

Country Status (1)

Country Link
JP (1) JPS56149149A (en)

Also Published As

Publication number Publication date
JPS639416B2 (en) 1988-02-29

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