GB1431951A - System for transmission of analogue data over a single trans mission channel from one of a plurality of remote stations to a central station - Google Patents

System for transmission of analogue data over a single trans mission channel from one of a plurality of remote stations to a central station

Info

Publication number
GB1431951A
GB1431951A GB2633473A GB2633473A GB1431951A GB 1431951 A GB1431951 A GB 1431951A GB 2633473 A GB2633473 A GB 2633473A GB 2633473 A GB2633473 A GB 2633473A GB 1431951 A GB1431951 A GB 1431951A
Authority
GB
United Kingdom
Prior art keywords
tone
central station
transmission
remote
sensor
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.)
Expired
Application number
GB2633473A
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.)
Physics International Co
Original Assignee
Physics International Co
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 Physics International Co filed Critical Physics International Co
Priority to GB2633473A priority Critical patent/GB1431951A/en
Publication of GB1431951A publication Critical patent/GB1431951A/en
Expired 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • G08C15/02—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division

Landscapes

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

Abstract

1431951 Selective signalling PHYSICS INTERNATIONAL CO 1 June 1973 26334/73 Heading G4H In a system for transmission of analog data over a single transmission channel from sensors at one of a plurality of remote stations to a central station, the central station sends an address signal to select one of the remote stations and initiate therein a ramp signal and transmission of a plurality of distinct tones associated one with each sensor, transmission of each tone being terminated when the ramp equals the output of the respective sensor. The address signal is one (or more) tone and recognition of it in a remote station triggers a pulse generator, the pulse from which is integrated to constitute the ramp, the leading edge of the pulse also closing switches passing the outputs of sensor tone generators, each switch being subsequently opened under control of the respective comparator comparing the respective sensor output with the ramp. The durationsignificant tone outputs are sent together over the transmission channel (e.g. telephone line) to the central station, followed by the remote station address tone(s). Each duration-significant sensor tone is passed by a filter respective to its frequency, amplified, rectified, filtered (using a capacitor), amplified and integrated to reproduce the original sensor output amplitude which is stored on a respective capacitor. The address tone sent out from the central station is also filtered &c. in the central station to trigger a monostable to define a time interval during which the remote station should send its address tone back (as mentioned above). If it arrives during this interval, an AND gate, responsive to the monostable and to a filter &c. recognizing the returned tone, actuates a relay to pass the capacitor outputs via a sequencing switch to remote indicating, recording and processing stations.
GB2633473A 1973-06-01 1973-06-01 System for transmission of analogue data over a single trans mission channel from one of a plurality of remote stations to a central station Expired GB1431951A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2633473A GB1431951A (en) 1973-06-01 1973-06-01 System for transmission of analogue data over a single trans mission channel from one of a plurality of remote stations to a central station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2633473A GB1431951A (en) 1973-06-01 1973-06-01 System for transmission of analogue data over a single trans mission channel from one of a plurality of remote stations to a central station

Publications (1)

Publication Number Publication Date
GB1431951A true GB1431951A (en) 1976-04-14

Family

ID=10242038

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2633473A Expired GB1431951A (en) 1973-06-01 1973-06-01 System for transmission of analogue data over a single trans mission channel from one of a plurality of remote stations to a central station

Country Status (1)

Country Link
GB (1) GB1431951A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432742A1 (en) * 1978-05-04 1980-02-29 Hochiki Co PHYSICAL CONDITION MONITORING APPARATUS USING REMOTE SENSORS
EP0175552A2 (en) * 1984-09-15 1986-03-26 E.D.A. RESEARCH & DEVELOPMENT LIMITED Improvements in or relating to the monitoring of fluids

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432742A1 (en) * 1978-05-04 1980-02-29 Hochiki Co PHYSICAL CONDITION MONITORING APPARATUS USING REMOTE SENSORS
EP0175552A2 (en) * 1984-09-15 1986-03-26 E.D.A. RESEARCH & DEVELOPMENT LIMITED Improvements in or relating to the monitoring of fluids
EP0175552A3 (en) * 1984-09-15 1987-12-16 E.D.A. RESEARCH & DEVELOPMENT LIMITED Improvements in or relating to the monitoring of fluids

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee