US2554596A - Supervision circuit for telegraph systems - Google Patents

Supervision circuit for telegraph systems Download PDF

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Publication number
US2554596A
US2554596A US792246A US79224647A US2554596A US 2554596 A US2554596 A US 2554596A US 792246 A US792246 A US 792246A US 79224647 A US79224647 A US 79224647A US 2554596 A US2554596 A US 2554596A
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United States
Prior art keywords
armature
point
relay
potential
tube
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Expired - Lifetime
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US792246A
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English (en)
Inventor
Snijders Antonie
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Individual
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Individual
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Publication of US2554596A publication Critical patent/US2554596A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L15/00—Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code
    • H04L15/24—Apparatus or circuits at the receiving end
    • H04L15/26—Apparatus or circuits at the receiving end operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines

Definitions

  • the invention refers to a supervisory arrangement for a teleprinter communication system.
  • the object of the invention is to provide a receiving arrangement responsive to a signal consisting of a mark start element followed by five mark elements. Ordinarily teleprinters are not responsive to this five-mark-signal.
  • the arrangement of the present invention is not responsive to the signals which actuate the teleprinter.
  • the arrangement according to the invention comprises a group of a condenser and a high ohmic leak resistance as a timing device.
  • the leak resistance is shunted by a diode causing the timing device to act slowly for one current direction, but rapidly for the opposite direction of the current.
  • the voltage across the condenser serves as a bias for a three-electrode vacuum tube, the terminals of the condenser being connected to the cathode and the grid, respectively.
  • the only figure is a wiring diagram of an arrangement according to the invention.
  • a telegraph battery has its midpoints grounded and is bridged by two potentiometer resistances R3 and R4, the junction of the resistances R3 and R4 being formed by a point Z.
  • Point Z is connected to a high ohmic resistance RI and the cathode of a diode D which bridges the resistance RI by having its anode connected to a point Y being the junction of resistance RI and a condenser Cl the other side of which is formed by a point X connected to the cathode of a three-electrode vacuum tube B.
  • the grid of tube B is connected by a resistance R2 to the point Y and the anode of diode D.
  • Point X is connected to the armature a of a signal reception relay A.
  • Armature a moves between two stationary contacts connected, respectively, to the positive and negative battery terminals.
  • a supervisory relay AR having two armatures m and ar Armature ar is connected to the negative battery terminal over a resistance R5 and a switch S which may be hand-operated, and the contact with which ar cooperates is connected to the terminal of relay AR which is connected to the anode of tube B.
  • Armature a1" is connected in series between the negative battery terminal of a supervisory circuit SC the other terminal of which is connected to the positive battery terminal.
  • the condenser C1 and the resistance R1 are connected in series and form a time delay circuit for tube B, resistance R1 being shunted by the diode D.
  • the operation of tube B depends on the voltage diiierence between the points X and Y.
  • the relay armature a which is controlled by the signal reception relay A, connects point X to the positive battery terminal e. g. to volts.
  • Point Y has the same potential as point Z, which is determined by the values of potentiometer resistances R3 and R4, and is negative with respect to the potential of point X.
  • point Y may have a potential of 20 volts, i. e. volts less than the potential of point X.
  • the start element When a signal arrives, the start element causes relay armature a to reverse, and the potential of point X is shifted by 120 volts from 60 to 60 volts.
  • the potentiometer resistances R3 and R can be equal to each other so that point Z assumes ground potential without being grounded directly.
  • the time delay in operation of the tube B is in such an arrangement dependent on the battery voltage and on the symmetry of the battery.
  • Any of the signals to which the teleprinter is responsive comprises at least one space ele-. ment within 100 milliseconds after the start. This element causes the armature a to move back to the positive battery voltage, making the potential of point X+60 volts. The voltage between points Y and Z changes its size and the diode D becomes conductive, making the potential.
  • diode i understood to include vacuum tube diodes, rectifier cells, resistors the resistance value of which depends on the temperature, and the like.
  • the five-mark signal to which the described arrangement responds is not used for the teleprinter, because otherwise every line current interruption would be printed.
  • the tube B becomes conductive when 100 milliseconds after the start element the fifth mark arrives.
  • the anode current energizes the supervisory relay AR, having an armature are to actuuate a monitor or supervisory circuit SC. Holding armature cm keeps thereby AR in operation even if tube B should become non-conductive again by the stop element of the signal. Relay AR can be restored to normal by interrupting the holding circuit by the switch S.
  • the supervisory circuit SC can serve for any convenient purpose which has no relation to the invention proper. For example it may start a visual and/or audible alarm (not shown), call a receiver for special messages (e. g. time signals transmitted in five-unit code), give a closing signal, etc.
  • a visual and/or audible alarm not shown
  • call a receiver for special messages e. g. time signals transmitted in five-unit code
  • the battery shown in the drawing can be the same as that serving the teleprinters. For that purpose its midpoint is grounded, but for the present invention the ground connection is. not essential. With a common battery serving both the teleprinter and the above described device, relay A. and its armature a may also be utilized for both these purposes. For this reason the normal or space position is shown in the draw.- ing with positive battery voltage on the armature a, in accordance with standard teleprinter practice. The resistances R2 and B5. protect the tube 13 against excessive amperages.
  • a device for receiving special signals in a teleprinter code comprising in combination, a D. C. source; means for defining a point having athird potential between the terminal potentials of said D. C. source; a receiving relay having a movable armature; two stationary contacts cooperating with said armature and being connected, respectively, with the terminals of said D. C. source; a condenser and a high ohmic resistance connected in series between said armatureoi'.
  • saidreceiving relay and said point having a third potential; a diode connected in shunt tosaidhigh ohmic resistance; a vacuum tube having at least an anode, a cathode and a grid, said cathode and said grid being connected, respectively; to the terminals of said condenser; a supervisory relay connected in the anode circuit of said vacuum tube and having an armature; and a supervisory circuit controlled by said armature of said supervisory relay.
  • a device for receiving special signals in a teleprinter code comprising in combination,v a D. C. source; a potentiometer connected across said D. C. source and having a tap; a receiving.
  • relay having a movable armature; two stationary contacts cooperating with said armature and be-' ing connected, respectively, with the terminals of said D. C. source; a condenser and'a'higlr ohmic resistance connected in series between said armature of said receiving relay and said tapof said potentiometer; a diode connected in shunt.
  • a vacuum tube having at least'an anode, a cathode and a grid,
  • supervisory relay connected inthe anode circuit of said vacuum tubeand havingan armature; and a supervisory circuit controlledby said armature of said supervisory relay.
  • teleprinter. code comprising in combination, a. D. C. source; means for defining a point having.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Alarm Systems (AREA)
US792246A 1946-09-14 1947-12-17 Supervision circuit for telegraph systems Expired - Lifetime US2554596A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL287403X 1946-09-14

Publications (1)

Publication Number Publication Date
US2554596A true US2554596A (en) 1951-05-29

Family

ID=19782591

Family Applications (1)

Application Number Title Priority Date Filing Date
US792246A Expired - Lifetime US2554596A (en) 1946-09-14 1947-12-17 Supervision circuit for telegraph systems

Country Status (7)

Country Link
US (1) US2554596A (en(2012))
BE (1) BE483170A (en(2012))
CH (1) CH287403A (en(2012))
DE (1) DE838317C (en(2012))
FR (1) FR958115A (en(2012))
GB (1) GB655371A (en(2012))
NL (1) NL63019C (en(2012))

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL98958C (en(2012)) * 1956-10-16

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2094733A (en) * 1933-05-25 1937-10-05 Rca Corp Automatic alarm selector
US2442427A (en) * 1946-04-03 1948-06-01 Automatic Elect Lab Supervisory alarm system for telephone interrupters

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2094733A (en) * 1933-05-25 1937-10-05 Rca Corp Automatic alarm selector
US2442427A (en) * 1946-04-03 1948-06-01 Automatic Elect Lab Supervisory alarm system for telephone interrupters

Also Published As

Publication number Publication date
FR958115A (en(2012)) 1950-03-03
NL63019C (en(2012))
BE483170A (en(2012))
DE838317C (de) 1952-05-08
GB655371A (en) 1951-07-18
CH287403A (fr) 1952-11-30

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