JPS5520022A - Remote monitor system - Google Patents

Remote monitor system

Info

Publication number
JPS5520022A
JPS5520022A JP9235378A JP9235378A JPS5520022A JP S5520022 A JPS5520022 A JP S5520022A JP 9235378 A JP9235378 A JP 9235378A JP 9235378 A JP9235378 A JP 9235378A JP S5520022 A JPS5520022 A JP S5520022A
Authority
JP
Japan
Prior art keywords
filter
circuits
input
output
frequency
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
JP9235378A
Other languages
Japanese (ja)
Inventor
Shozo Yabe
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP9235378A priority Critical patent/JPS5520022A/en
Publication of JPS5520022A publication Critical patent/JPS5520022A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • H04Q9/08—Calling by using continuous ac

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Selective Calling Equipment (AREA)

Abstract

PURPOSE:To secure monitoring for the state change of several slave stations at the master station in the remote place by opening electrically between the input and the output of the filter at the abnormal time and then short-circuiting electrically between the input and the output of the filter at the normal time to make pass even the self-allotment frequency signal component. CONSTITUTION:Slave stations A1-An are connected to closed loop transmission line B, and the both ends of line B are connected to master station C. The master station possesses transmission part T including signal generation circuits OSC1-n to generate different frequency signals and circuits MD1-n to modulate these frequency signals plus reception part R including circuits DM1-n to demodulate the signals supplied from line B and detection circuits DET1-4 respectively. While the slave station possesses filter BF1-n to cut the own frequency signals and pass through the frequency bands allotted to other slave stations plus detectors S1-n to detect the state change at the abnormal time with the electric short given between the input and the output of the filter and then pass even the self-allotment frequency component through.
JP9235378A 1978-07-28 1978-07-28 Remote monitor system Pending JPS5520022A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9235378A JPS5520022A (en) 1978-07-28 1978-07-28 Remote monitor system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9235378A JPS5520022A (en) 1978-07-28 1978-07-28 Remote monitor system

Publications (1)

Publication Number Publication Date
JPS5520022A true JPS5520022A (en) 1980-02-13

Family

ID=14052028

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9235378A Pending JPS5520022A (en) 1978-07-28 1978-07-28 Remote monitor system

Country Status (1)

Country Link
JP (1) JPS5520022A (en)

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