JPS5599895A - Terminal control system - Google Patents

Terminal control system

Info

Publication number
JPS5599895A
JPS5599895A JP750679A JP750679A JPS5599895A JP S5599895 A JPS5599895 A JP S5599895A JP 750679 A JP750679 A JP 750679A JP 750679 A JP750679 A JP 750679A JP S5599895 A JPS5599895 A JP S5599895A
Authority
JP
Japan
Prior art keywords
frequency
failure
fed
circuits
ad4n
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
JP750679A
Other languages
Japanese (ja)
Other versions
JPS6221440B2 (en
Inventor
Kazunori Terao
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP750679A priority Critical patent/JPS5599895A/en
Publication of JPS5599895A publication Critical patent/JPS5599895A/en
Publication of JPS6221440B2 publication Critical patent/JPS6221440B2/ja
Granted 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
    • H04Q9/12—Calling by using continuous ac using combinations of frequencies

Landscapes

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

Abstract

PURPOSE:To prevent malfunction by stopping the operation of terminal unit, when failure in the time length of each frequency, failure in arrangement of frequency or duplication of frequency is detected, after the discrimination of frequency at terminals. CONSTITUTION:In controlling terminals by selecting the operation items of terminal and terminal itself with the combination of frequencies through and delivery of serial signal of a plurality of frequencies from the monitor control station to a plurality of terminals, the discrimination of frequency is made with BPF1-BPF3n, and level detection and A/D conversion are made with the detectors DET1- DET3n. The output of the detectors DET1 and DET2 is fed to the circuit combining the logic circuit and delay circut or the like to detect the time length, arrangement and duplication of frequency. If failure, alarm signal is fed to the AND circuits AD41-AD4n. Further, the output of the detectors DET31-DET3n is fed to the circuit combining delay circuits to detect the failure in frequency against operation items, and it is fed to the circuits AD41-AD4n, and the operation of the unit is stopped with the output of the circuits AD41-AD4n.
JP750679A 1979-01-24 1979-01-24 Terminal control system Granted JPS5599895A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP750679A JPS5599895A (en) 1979-01-24 1979-01-24 Terminal control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP750679A JPS5599895A (en) 1979-01-24 1979-01-24 Terminal control system

Publications (2)

Publication Number Publication Date
JPS5599895A true JPS5599895A (en) 1980-07-30
JPS6221440B2 JPS6221440B2 (en) 1987-05-12

Family

ID=11667663

Family Applications (1)

Application Number Title Priority Date Filing Date
JP750679A Granted JPS5599895A (en) 1979-01-24 1979-01-24 Terminal control system

Country Status (1)

Country Link
JP (1) JPS5599895A (en)

Also Published As

Publication number Publication date
JPS6221440B2 (en) 1987-05-12

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