GB8904444D0 - Secure data communication system - Google Patents

Secure data communication system

Info

Publication number
GB8904444D0
GB8904444D0 GB898904444A GB8904444A GB8904444D0 GB 8904444 D0 GB8904444 D0 GB 8904444D0 GB 898904444 A GB898904444 A GB 898904444A GB 8904444 A GB8904444 A GB 8904444A GB 8904444 D0 GB8904444 D0 GB 8904444D0
Authority
GB
United Kingdom
Prior art keywords
communication system
data communication
secure data
secure
data
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Withdrawn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
GB898904444A
Other versions
GB2228603A (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.)
Shorrock Ltd
Original Assignee
Shorrock 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 Shorrock Ltd filed Critical Shorrock Ltd
Priority to GB8904444A priority Critical patent/GB2228603A/en
Publication of GB8904444D0 publication Critical patent/GB8904444D0/en
Publication of GB2228603A publication Critical patent/GB2228603A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/001—Alarm systems in which substations are interrogated in succession by a central station with individual interrogation of substations connected in parallel
    • G08B26/003—Alarm systems in which substations are interrogated in succession by a central station with individual interrogation of substations connected in parallel replying the identity and the state of the sensor
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
    • 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]
    • H04L12/40—Bus networks
    • H04L12/403—Bus networks with centralised control, e.g. polling

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
GB8904444A 1989-02-27 1989-02-27 Secure data communication system Withdrawn GB2228603A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8904444A GB2228603A (en) 1989-02-27 1989-02-27 Secure data communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8904444A GB2228603A (en) 1989-02-27 1989-02-27 Secure data communication system

Publications (2)

Publication Number Publication Date
GB8904444D0 true GB8904444D0 (en) 1989-04-12
GB2228603A GB2228603A (en) 1990-08-29

Family

ID=10652389

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8904444A Withdrawn GB2228603A (en) 1989-02-27 1989-02-27 Secure data communication system

Country Status (1)

Country Link
GB (1) GB2228603A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2957354B2 (en) * 1992-05-13 1999-10-04 三菱電機株式会社 Signal transfer method
GB2334359A (en) * 1998-02-11 1999-08-18 Scantronic Ltd Identifying devices in an electronic system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4228424A (en) * 1978-10-16 1980-10-14 Baker Protective Services, Incorporated Central station alarm
GB2176639B (en) * 1985-05-31 1988-11-23 Mars Inc Data acquisition system

Also Published As

Publication number Publication date
GB2228603A (en) 1990-08-29

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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)