WO1999055003A1 - Adaptateur de jonctions a alimentation externe - Google Patents

Adaptateur de jonctions a alimentation externe Download PDF

Info

Publication number
WO1999055003A1
WO1999055003A1 PCT/DE1998/003779 DE9803779W WO9955003A1 WO 1999055003 A1 WO1999055003 A1 WO 1999055003A1 DE 9803779 W DE9803779 W DE 9803779W WO 9955003 A1 WO9955003 A1 WO 9955003A1
Authority
WO
WIPO (PCT)
Prior art keywords
volts
coupling piece
internal circuit
piece according
interface
Prior art date
Application number
PCT/DE1998/003779
Other languages
German (de)
English (en)
Inventor
Gmbh Klöckner-Moeller
Original Assignee
Culca, Horea-Stefan
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
Priority claimed from DE19817441A external-priority patent/DE19817441A1/de
Application filed by Culca, Horea-Stefan filed Critical Culca, Horea-Stefan
Publication of WO1999055003A1 publication Critical patent/WO1999055003A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/017509—Interface arrangements
    • H03K19/017536—Interface arrangements using opto-electronic devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/382—Information transfer, e.g. on bus using universal interface adapter
    • G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
    • G06F13/4286—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a handshaking protocol, e.g. RS232C link

Definitions

  • the invention relates to a coupling piece for digital data transmission between an electrical interface of a first device and an electrical interface of a second device, the devices each using different voltage levels to differentiate between the two logic states “high” and “low”. If two electronic devices communicate with each other using data transmission, they must speak the same language. In the direct transmission of digital data, this means that the logic states "high” and “low” must be represented by the same voltage level in both devices.
  • Two standards are used in digital data transmission.
  • One standard works according to the RS 232 standard with signals which indicate the "high” state with pulses of a voltage of approximately +12 volts and the "low” state with pulses of a voltage of approximately -12 volts.
  • Such serial interfaces are preferably used in computing systems such as personal computers (PC).
  • PC personal computers
  • the signals must be transformed for communication between two electronic devices that operate at different voltage levels.
  • the positive signals In the case of the transformation of signals of the TTL standard, the positive signals must be amplified to +12 volts. This amplification of the signals is so far technically complex, as external voltage sources are required. In the case of the RS 232 and the TTL standard, however, the signal strength can be reduced by simply blocking the voltage by means of a diode or by transforming the voltage down.
  • the object of the invention is a
  • optocouplers which are available in any number of variants on the market. Such optocouplers are also suitable for converting the +12 volt signals to the TTL level of +5 volts. The conversion in this direction is advantageously also accomplished by the internal circuit.
  • the internal circuit In order to convert the signal of the strength of -12 volts to the TTL level of 0 volts, the internal circuit is advantageously provided with a blocking element, for example in the form of a simple diode.
  • the internal circuit is accommodated in a housing which is injection molded from plastic and which can be placed directly on the mechanical interface of one of the two devices as a plug.
  • the path to the other interface is bridged by a cable to the data line.
  • Figure 1 is a programmable logic controller with interface adapter and external computer and Figure 2 is a circuit diagram of the externally supplied
  • FIG. 1 shows a programmable logic controller with a housing 1 and with a series of voltage inputs 2 and signal outputs 3. The control switches under the control of one
  • Switching program the current flow between the inputs 2 and the outputs 3.
  • the program can be entered into the computing unit housed in the housing 1 on the one hand by means of the control keys 4 and the multifunction key 5, the input and the program sequence on the Screen 6 are observable.
  • a menu-guided user interface is shown on the screen 6 during programming.
  • Computer 7 and the controller are connected via a data line 8, the computer side into an RS 232 interface (not shown) on the back of the computer and the controller into an interface 9.
  • An externally supplied interface is on the controller 9
  • Interface adapter 10 placed, which is designed as a plug with a housing 11 and a standardized plug head 12.
  • FIG. 2 shows the internal circuit 23 of the interface adapter 10.
  • the connections to the interface of the computer are shown on the right side of FIG. 2 and the connections to the interface 9 of the controller are shown on the left side.
  • a transmission line (TxD) 11 for a TTL signal of 5 volts leads into an optocoupler 12.
  • the 5 volt signal on line 11 leads to a galvanically isolated first signal state on a line 16 and to two switches to be controlled by it 13a and 13b. In the state shown, the switch 13a is closed and connects two lines 14 and 15 coming from the RS 232 of the computer.
  • the computer is programmed in such a way that a voltage of 12 volts is present on line 14 (RTS line).
  • this voltage is applied to line 15, the input RxD of the interface.
  • the switch 13a remains closed for the duration of the first signal state on line 16, so that there is a correspondingly long 12 volt pulse on line 15.
  • the switch 13a opens and the switch 13b closes.
  • the switch 13b then creates a connection between the lines 15 and 17 of the RS 232, the computer being programmed so that a constant voltage of -12 volts is present on line 17, the output DTR.
  • the adapter also has a circuit for converting the signals from the computer to the controller.
  • the signal present on line 18, line RxD of RS 232, can be fed directly to an optocoupler 19.
  • the optocoupler 19 converts the computer's signals from +12 volts to +5 volts on the RxD line 20 of the controller.
  • a signal of -12 volts on line 18 is blocked by the diode 21, so that about 0 volts for the TTL state "low" is present on line 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Computing Systems (AREA)
  • Mathematical Physics (AREA)
  • Dc Digital Transmission (AREA)

Abstract

Pièce de couplage pour transfert de données numériques entre une jonction électrique d'un premier appareil et une jonction électrique d'un deuxième appareil, les appareils utilisant chacun des niveaux de tension différents pour la discrimination de deux états logiques "haut" et "bas", caractérisée en ce qu'il est prévu une commutation interne (23) au moyen de laquelle les niveaux de tension du premier appareil peuvent être commutés sur les niveaux de tension, correspondant à l'état, du deuxième appareil, en ce que la commutation interne pour la transposition du niveau de tension inférieur au niveau de tension supérieur peut être amenée au niveau de tension supérieur par l'un des deux appareils, et en ce que la commutation interne (23) effectue la transposition par un processus de commutation.
PCT/DE1998/003779 1998-04-20 1998-12-23 Adaptateur de jonctions a alimentation externe WO1999055003A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19817441A DE19817441A1 (de) 1998-03-20 1998-04-20 Fremdversorgter Schnittstellenadapter
DE19817441.1980420 1998-04-20

Publications (1)

Publication Number Publication Date
WO1999055003A1 true WO1999055003A1 (fr) 1999-10-28

Family

ID=7865098

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/003779 WO1999055003A1 (fr) 1998-04-20 1998-12-23 Adaptateur de jonctions a alimentation externe

Country Status (1)

Country Link
WO (1) WO1999055003A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5402015A (en) * 1991-10-28 1995-03-28 G. M. Pfaff Aktiengesellschaft Cable connection between a PC and a sewing machine
DE4422465A1 (de) * 1994-06-28 1996-01-04 Lars Poewe Ein ökonomisch optimiertes Computer-Interface-Kabel für PCs zur Verbindung mit Computern mit pegelfremdem Anschluß, eine EIN-BAUTEIL-SCHALTUNG gleicht den Pegel an und schützt geichzeitig den an den PC angeschlossenen Computer
US5555421A (en) * 1993-11-23 1996-09-10 Kistler Instrument Company Bidirectional interface for interconnecting two devices and the interface having first optical isolator and second optical isolator being powered by first and second device ports
DE19514888A1 (de) * 1995-04-22 1996-10-24 Rexroth Mannesmann Gmbh Schnittstellenkonverter
DE19620820A1 (de) * 1995-05-24 1996-11-28 Bticino Spa Elektrisches Anschlußsystem zur Übertragung digitaler Signale zwischer einer Telematik-Anlage und peripheren Elektronikeinheiten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5402015A (en) * 1991-10-28 1995-03-28 G. M. Pfaff Aktiengesellschaft Cable connection between a PC and a sewing machine
US5555421A (en) * 1993-11-23 1996-09-10 Kistler Instrument Company Bidirectional interface for interconnecting two devices and the interface having first optical isolator and second optical isolator being powered by first and second device ports
DE4422465A1 (de) * 1994-06-28 1996-01-04 Lars Poewe Ein ökonomisch optimiertes Computer-Interface-Kabel für PCs zur Verbindung mit Computern mit pegelfremdem Anschluß, eine EIN-BAUTEIL-SCHALTUNG gleicht den Pegel an und schützt geichzeitig den an den PC angeschlossenen Computer
DE19514888A1 (de) * 1995-04-22 1996-10-24 Rexroth Mannesmann Gmbh Schnittstellenkonverter
DE19620820A1 (de) * 1995-05-24 1996-11-28 Bticino Spa Elektrisches Anschlußsystem zur Übertragung digitaler Signale zwischer einer Telematik-Anlage und peripheren Elektronikeinheiten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"goedkope galvanische scheider voor RS232", ELEKTUUR, July 1997 (1997-07-01), pages 89, XP002102753 *

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