GB8711915D0 - Electronic alarm unit - Google Patents

Electronic alarm unit

Info

Publication number
GB8711915D0
GB8711915D0 GB878711915A GB8711915A GB8711915D0 GB 8711915 D0 GB8711915 D0 GB 8711915D0 GB 878711915 A GB878711915 A GB 878711915A GB 8711915 A GB8711915 A GB 8711915A GB 8711915 D0 GB8711915 D0 GB 8711915D0
Authority
GB
United Kingdom
Prior art keywords
alarm
indication
line
signal
change
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.)
Withdrawn
Application number
GB878711915A
Other versions
GB2205019A (en
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.)
PLANET TECHNOLOGY Ltd
Original Assignee
PLANET TECHNOLOGY 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 PLANET TECHNOLOGY Ltd filed Critical PLANET TECHNOLOGY Ltd
Priority to GB08711915A priority Critical patent/GB2205019A/en
Publication of GB8711915D0 publication Critical patent/GB8711915D0/en
Publication of GB2205019A publication Critical patent/GB2205019A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751—Error or fault detection not based on redundancy
    • G06F11/0754—Error or fault detection not based on redundancy by exceeding limits
    • G06F11/0757—Error or fault detection not based on redundancy by exceeding limits by exceeding a time limit, i.e. time-out, e.g. watchdogs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/30—Monitoring
    • G06F11/32—Monitoring with visual or acoustical indication of the functioning of the machine
    • G06F11/324—Display of status information
    • G06F11/327—Alarm or error message display
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/30—Monitoring
    • G06F11/32—Monitoring with visual or acoustical indication of the functioning of the machine
    • G06F11/324—Display of status information
    • G06F11/325—Display of status information by lamps or LED's

Abstract

The alarm device is arranged to sense an electrical interface signal between two items of equipment; and comprises a timer means arranged to be started by a change in the signal and to delay the indication of an alarm, and a latch means arranged to reset the timer before the indication of an alarm upon reversal of such change, so that transient changes, do not trigger the alarm. The alarm senses voltage levels at (A,B Fig 2) on, for example a carrier detect line, data receive line, or a signal quality line. A plurality of alarms may be associated. The device may reset automatically upon cessation of the alarm condition, or may require manual resetting. LED's, an audible source and a relay provide the alarm indication (Fig 2). <IMAGE>
GB08711915A 1987-05-20 1987-05-20 Electronic alarm unit Withdrawn GB2205019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08711915A GB2205019A (en) 1987-05-20 1987-05-20 Electronic alarm unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08711915A GB2205019A (en) 1987-05-20 1987-05-20 Electronic alarm unit

Publications (2)

Publication Number Publication Date
GB8711915D0 true GB8711915D0 (en) 1987-06-24
GB2205019A GB2205019A (en) 1988-11-23

Family

ID=10617633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08711915A Withdrawn GB2205019A (en) 1987-05-20 1987-05-20 Electronic alarm unit

Country Status (1)

Country Link
GB (1) GB2205019A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471488A (en) * 1994-04-05 1995-11-28 International Business Machines Corporation Clock fault detection circuit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795800A (en) * 1972-09-13 1974-03-05 Honeywell Inf Systems Watchdog reload initializer
US4263647A (en) * 1979-02-07 1981-04-21 Allen-Bradley Company Fault monitor for numerical control system
US4408299A (en) * 1980-10-30 1983-10-04 Essex Group Inc. Automatic resetting of control system for loss of functionality
JPS58201108A (en) * 1982-05-19 1983-11-22 Nissan Motor Co Ltd Monitoring device of electronic control system for vehicle using microcomputer
US4766601A (en) * 1985-12-23 1988-08-23 Tektronix, Inc. Constant carrier watchdog

Also Published As

Publication number Publication date
GB2205019A (en) 1988-11-23

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)