EP0568938A1 - Method of the production of a disturbance-free radio-communication - Google Patents

Method of the production of a disturbance-free radio-communication Download PDF

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Publication number
EP0568938A1
EP0568938A1 EP93107065A EP93107065A EP0568938A1 EP 0568938 A1 EP0568938 A1 EP 0568938A1 EP 93107065 A EP93107065 A EP 93107065A EP 93107065 A EP93107065 A EP 93107065A EP 0568938 A1 EP0568938 A1 EP 0568938A1
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Prior art keywords
receiver
transmitter
channel
signal
frequency
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EP93107065A
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German (de)
French (fr)
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EP0568938B1 (en
Inventor
Thomas Burchard
Wolfgang Bredow
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NBB Controls and Components AG
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NBB Nachrichtentechnik GmbH and Co KG
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Definitions

  • the invention relates to a method according to the preamble of patent claim 1.
  • DE-OS 38 13 820 shows a system for transmitting control commands by means of an HF transmission / reception system.
  • telegrams For the transmission of the commands, so-called telegrams are used which, in addition to the actual control commands for the machine to be controlled, contain a unique assignment feature (address), through the evaluation of which the receiver is able to determine whether the telegrams come from the sender assigned to them or Not.
  • These telegrams are generated in the remote control transmitter by a corresponding electronic circuit (encoder) and modulated onto the RF signal generated by the RF transmitter (usually frequency modulation).
  • the receiver receives this modulated RF signal with the aid of an RF receiver, which in turn emits the original data telegram to the decoder unit (s) after demodulation, which then provides the desired control signal for the machine to be controlled.
  • the basic principle here is that the control commands may only be passed on to the machine if the address information obtained from the telegram matches the address information programmed in the remote control receiver.
  • each of the RF channels must be examined by the receiver to determine whether the own transmitter is transmitting there or not; this means that the receiver must always wait for the response from the telegram decoder before it can check the next channel during a channel search. This usually takes a very long time, since it can only be assumed after a certain period of time that the negative answer the telegram decoder is based on the fact that no telegram or a non-system telegram was received.
  • the object of the invention is to improve the previously known method so that the channel search processes are accelerated by the receiver.
  • the Sqelch signal which is usually available in the standard components from which RF receivers are constructed, is evaluated as quick information for initiating further switching operations. It is assumed that the Sqelch signal serves as general "occupancy information" of the RF channel currently set by the receiver, i.e. it provides the information as to whether this channel is occupied or not. This information is initially completely sufficient for many operating modes and switching operations to initiate the next procedural step, because if, for example, the Sqelch signal indicates that the channel is not occupied at all by radio frequency, then this cannot be an RF channel occupied by its own transmitter without an evaluation of the telegram address in the receiver.
  • the transmitter S shown in Figure 1 consists of the high-frequency transmission part HFS, the high-frequency channel can be selected by a programming logic P by the user.
  • the receiver R initially consists in a known manner of the actual receiving part HFR and the downstream telegram decoder DEC, the output signal S of which triggers the desired function of the controlled machine.
  • the Sqelch output of the receiving part HFR and the address output of the address decoder DEC are connected to a scanning circuit SCAN, which in turn can switch the receiving channel of the receiving unit HFR via a control line CH.
  • the basic function of the scanning circuit SCAN consists in the preferred evaluation of the squelch signal on the line SQ and only then in the evaluation of the information "address is correct" on the address feedback line ADR from the address decoder DEC.
  • the scanning circuit SCAN switches the channel over the control line CH by one channel if the circuit is to perform the function "receiver seeks the transmitter channel", or it initiates it Feedback information to the transmitter, if the receiver is to perform the function "Receiver seeks free channel", since the absence of the Sqelch signal signals the presence of a free channel.
  • the two operating modes outlined in FIGS. 2 and 3 can also be used in combination in the same transmitter / receiver unit if simple additional circuitry means (for example a switch) ensure that the channel switching through the scanning circuit SCAN occurs once when the squelch is present. Signals (squelch level high), which is carried out another time when the squelch signal (squelch level low) is not present.
  • simple additional circuitry means for example a switch
  • the operating mode according to FIG. 3 (receiver is looking for a free channel) can be implemented in different "comfort levels":
  • the feedback information from the receiver to the transmitter consists in activating a display means (for example a lamp) in the transmitter which informs the operator of the transmitter whether the receiver has now found a free channel; then the operator must switch the transmitter by means of the channel selector until the transmitter has found the free channel defined by the receiver, which is determined by the address check in the receiver. In this case, the return information to the transmitter is then changed (for example the lamp is switched off) in such a way that the operator knows that the actual transmission mode (transmission of control commands) can now begin.
  • a display means for example a lamp
  • a much more comfortable, but also technically more complex version is to design the feedback information of the receiver to the transmitter so that the frequency of the channel determined as free (or a corresponding coded information) is also communicated to the transmitter and then the transmitter automatically the transmission channel according to this information.
  • the feedback to the "transmitter” can, for. B. done in that the transmitter is also equipped with a monitor RF receiving part, which searches for the feedback signal of the "receiver” by a scanner device, as described above, and engages thereon.
  • Both variants of the operating mode according to FIG. 3 naturally require more or less complex transmitter units at the receiver or receiver units at the transmitter in order to enable the feedback path.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transceivers (AREA)
  • Selective Calling Equipment (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Peptides Or Proteins (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

In a method for channel scanning by the receiver of a telecontrol system, the squelch signal of the RF section of the receiver is scanned for presence of an RF signal in the channel set and only then further switching or evaluating processes of the receiver are initiated in dependence on the result of this scan. As a result, the channel search normally used is considerably accelerated by scanning the received message addresses without requiring additional expenditure since the squelch signal is available in any case in the standard chips which are normally used and of which the RF receiver is constructed. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method according to the preamble of patent claim 1.

Die Übertragung von Steuerinformationen in Fernwirkanlagen ist grundsätzlich seit langem bekannt, beispielsweise zeigt die DE-OS 38 13 820 eine Anlage zur Übertragung von Steuerbefehlen mittels einer HF-Sende/Empfangsanlage.The transmission of control information in telecontrol systems has been known for a long time, for example DE-OS 38 13 820 shows a system for transmitting control commands by means of an HF transmission / reception system.

Für die Übertragung der Befehle werden sogenannte Telegramme verwendet, die neben den eigentlichen Steuerbefehlen für die zu steuernde Maschine ein eindeutiges Zuordnungsmerkmal (Adresse) enthalten, durch deren Auswertung der Empfänger in der Lage ist festzustellen, ob die die Telegramme von dem ihm zugeordneten Sender kommen oder nicht. Diese Telegramme werden im Fernsteuersender durch eine entsprechende elektronische Schaltung (Encoder) erzeugt und dem vom HF-Sender erzeugten HF-Signal aufmoduliert (üblicherweise Frequenzmodulation). Der Empfänger empfängt dieses modulierte HF-Signal mit Hilfe eines HF-Empfangsteils, das seinerseits nach der Demodulation das ursprüngliche Datentelegramm an den oder die Decodereinheiten abgibt, die dann das gewünschte Steuersignal für die anzusteuernde Maschine zur Verfügung stellt. Hierbei gilt der Grundsatz, daß nur dann die Steuerbefehle an die Maschine weitergegeben werden dürfen, wenn die aus dem Telegramm gewonnene Adresseninformation mit der im Fernsteuerempfänger fest programmierten Adresseninformation übereinstimmt.For the transmission of the commands, so-called telegrams are used which, in addition to the actual control commands for the machine to be controlled, contain a unique assignment feature (address), through the evaluation of which the receiver is able to determine whether the telegrams come from the sender assigned to them or Not. These telegrams are generated in the remote control transmitter by a corresponding electronic circuit (encoder) and modulated onto the RF signal generated by the RF transmitter (usually frequency modulation). The receiver receives this modulated RF signal with the aid of an RF receiver, which in turn emits the original data telegram to the decoder unit (s) after demodulation, which then provides the desired control signal for the machine to be controlled. The basic principle here is that the control commands may only be passed on to the machine if the address information obtained from the telegram matches the address information programmed in the remote control receiver.

Wie beispielsweise bei der genannten DE-OS 38 13 820 muß dabei jeder der HF-Kanäle vom Empfänger daraufhin untersucht werden, ob dort der eigene Sender sendet oder nicht; dies bedeutet, daß der Empfänger immer die Antwort der Telegrammdecoder abwarten muß, bevor es den nächsten Kanal bei einer Kanalsuche überprüfen kann. Dies dauert üblicherweise sehr lange, da erst nach einer gewissen Zeitspanne davon ausgegangen werden kann, daß die Negativantwort der Telegrammdecoder darauf beruht, daß kein oder ein systemfremdes Telegramm empfangen wurde.As with, for example, the aforementioned DE-OS 38 13 820, each of the RF channels must be examined by the receiver to determine whether the own transmitter is transmitting there or not; this means that the receiver must always wait for the response from the telegram decoder before it can check the next channel during a channel search. This usually takes a very long time, since it can only be assumed after a certain period of time that the negative answer the telegram decoder is based on the fact that no telegram or a non-system telegram was received.

Dies dauert relativ lange, so daß nach einem Frequenzwechsel durch den Sender eine gewisse Zeitspanne vergeht, bis der Empfänger durch die beschriebenen Abläufe "seinen" Kanal wiedergefunden hat und darauf einrasten kann.This takes a relatively long time, so that after a frequency change by the transmitter, a certain period of time passes until the receiver has "found" his channel again through the processes described and can snap onto it.

Aufgabe der Erfindung ist es, das vorbekannte Verfahren so zu verbessern, daß eine Beschleunigung der Kanalsuchvorgänge durch den Empfänger erreicht wird.The object of the invention is to improve the previously known method so that the channel search processes are accelerated by the receiver.

Erfindungsgemäß wird diese Aufgabe durch den kennzeichnenden Teil des Patentanspruchs 1 gelöst.According to the invention, this object is achieved by the characterizing part of patent claim 1.

Der Grundgedanke der Erfindung besteht darin, daß das Sqelch-Signal, das üblicherweise bei den Standardbausteinen, aus denen HF-Empfänger aufgebaut sind, zur Verfügung steht, als Schnellinformation zur Veranlassung weiterer Schaltvorgänge ausgewertet wird. Dabei wird davon ausgegangen, daß das Sqelch-Signal als allgemeine "Belegungsinformation" des gerade vom Empfänger eingestellten HF-Kanals dient, d.h., die Information zur Verfügung stellt, ob dieser Kanal überhaupt belegt ist oder nicht. Diese Information ist für viele Betriebsarten und Schaltvorgänge zunächst vollkommen ausreichend, um den nächsten Verfahrensschritt einzuleiten, denn wenn beispielsweise das Sqelch-Signal anzeigt, daß der Kanal überhaupt nicht mit Hochfrequenz belegt ist, dann kann dies auch kein vom eigenen Sender belegter HF-Kanal sein, ohne daß es dazu einer Auswertung der Telegramm-Adresse im Empfänger bedürfte.The basic idea of the invention is that the Sqelch signal, which is usually available in the standard components from which RF receivers are constructed, is evaluated as quick information for initiating further switching operations. It is assumed that the Sqelch signal serves as general "occupancy information" of the RF channel currently set by the receiver, i.e. it provides the information as to whether this channel is occupied or not. This information is initially completely sufficient for many operating modes and switching operations to initiate the next procedural step, because if, for example, the Sqelch signal indicates that the channel is not occupied at all by radio frequency, then this cannot be an RF channel occupied by its own transmitter without an evaluation of the telegram address in the receiver.

Zwei Verfahrensbeispiele werden anhand von Zeichnungen näher erläutert, es zeigen:

Figur 1:
Ein Blockschaltbild der HF-Sende/Empfangsanlage,
Figur 2:
ein Flußdiagramm einer ersten Betriebsweise "Empfänger sucht Senderkanal", und
Figur 3:
ein Flußdiagramm einer zweiten Betriebsweise "Empfänger sucht freien Kanal".
Two process examples are explained in more detail with reference to drawings, which show:
Figure 1:
A block diagram of the RF transmitter / receiver system,
Figure 2:
a flowchart of a first mode of operation "receiver seeks transmitter channel", and
Figure 3:
a flowchart of a second mode of operation "receiver seeks free channel".

Der in Figur 1 dargestellte Sender S besteht aus dem Hochfrequenz-Sendeteil HFS, dessen Hochfrequenzkanal von einer Programmierlogik P vom Benutzer gewählt werden kann.The transmitter S shown in Figure 1 consists of the high-frequency transmission part HFS, the high-frequency channel can be selected by a programming logic P by the user.

Der Empfänger R besteht zunächst in bekannter Weise aus dem eigentlichen Empfangsteil HFR und dem nachgeschalteten Telegrammdecoder DEC, dessen Ausgangssignal S die gewünschte Funktion der angesteuerten Maschine auslöst.The receiver R initially consists in a known manner of the actual receiving part HFR and the downstream telegram decoder DEC, the output signal S of which triggers the desired function of the controlled machine.

Der Sqelch-Ausgang des Empfangsteils HFR und der Adressenausgang des Adressendecoders DEC sind mit einer Abtastschaltung SCAN verbunden, die ihrerseits über eine Steuerleitung CH den Empfangskanal der Empfangseinheit HFR umschalten kann.The Sqelch output of the receiving part HFR and the address output of the address decoder DEC are connected to a scanning circuit SCAN, which in turn can switch the receiving channel of the receiving unit HFR via a control line CH.

Die grundlegende Funktion der Abtastschaltung SCAN besteht in der bevorzugten Auswertung des Squelch-Signals auf der Leitung SQ und erst danach in der Auswertung der Information "Adresse stimmt" auf der Adressenrückmeldeleitung ADR vom Adressendecoder DEC.The basic function of the scanning circuit SCAN consists in the preferred evaluation of the squelch signal on the line SQ and only then in the evaluation of the information "address is correct" on the address feedback line ADR from the address decoder DEC.

Zeigt das Sqelch-Signal an, daß auf dem eingestellten Empfangskanal kein Hochfrequenz-Signal vorliegt, so schaltet die Abtastschaltung SCAN den Kanal über die Steuerleitung CH um einen Kanal weiter, wenn die Schaltung die Funktion "Empfänger sucht Senderkanal" ausführen soll, oder er veranlaßt Rückmeldungsinformationen an den Sender, wenn der Empfänger die Funktion "Empfänger sucht freien Kanal" erfüllen soll, da das Nicht-Vorliegen des Sqelch-Signals gerade das Vorliegen eines freien Kanals signalisiert.If the Sqelch signal indicates that there is no high-frequency signal on the set receiving channel, the scanning circuit SCAN switches the channel over the control line CH by one channel if the circuit is to perform the function "receiver seeks the transmitter channel", or it initiates it Feedback information to the transmitter, if the receiver is to perform the function "Receiver seeks free channel", since the absence of the Sqelch signal signals the presence of a free channel.

Diese beiden beispielhaften Betriebsweisen unter Verwendung der Abtastschaltung SCAN und der Auswertung des Sqelch-Signals sind in den beiden in Figur 2 und 3 skizzierten Flußdiagramm dargestellt.These two exemplary operating modes using the scanning circuit SCAN and the evaluation of the Sqelch signal are shown in the two flowcharts outlined in FIGS. 2 and 3.

Die beiden in Figuren 2 und 3 skizzierten Betriebsweisen können auch kombiniert bei der gleichen Sender/Empfänger-Einheit eingesetzt werden, wenn durch einfache zusätzliche schaltungstechnische Mittel (z.B. einen Schalter) sichergestellt ist, daß die Kanalweiterschaltung durch die Abtastschaltung SCAN einmal bei Vorliegen des Squelch-Signals (Squelch-Level high), das anderemal bei Nicht-Vorliegen des Squelch-Signals (Squelch-Level low) durchgeführt wird.The two operating modes outlined in FIGS. 2 and 3 can also be used in combination in the same transmitter / receiver unit if simple additional circuitry means (for example a switch) ensure that the channel switching through the scanning circuit SCAN occurs once when the squelch is present. Signals (squelch level high), which is carried out another time when the squelch signal (squelch level low) is not present.

Die Betriebsweise nach Figur 3 (Empfänger sucht freien Kanal) kann in verschiedenen "Komfortstufen" realisiert werden:The operating mode according to FIG. 3 (receiver is looking for a free channel) can be implemented in different "comfort levels":

Beim einfachsten Fall besteht die Rückmeldeinformation des Empfängers an den Sender darin, im Sender ein Anzeigemittel (beispielsweise eine Lampe) zu aktivieren, die der Bedienungsperson des Senders mitteilt, ob nunmehr der Empfänger einen freien Kanal gefunden hat; dann muß die Bedienungsperson den Sender mittels des Kanalwählers so lange umschalten, bis der Sender den vom Empfänger festgelegten freien Kanal gefunden hat, was durch die Adressenüberprüfung im Empfänger ermittelt wird. In diesem Fall wird dann die Rückinformation an den Sender dahingehend geändert (beispielsweise die Lampe ausgeschaltet), daß die Bedienungsperson weiß, daß nunmehr der eigentliche Sendebetrieb (Übermittlung von Steuerbefehlen) beginnen kann.In the simplest case, the feedback information from the receiver to the transmitter consists in activating a display means (for example a lamp) in the transmitter which informs the operator of the transmitter whether the receiver has now found a free channel; then the operator must switch the transmitter by means of the channel selector until the transmitter has found the free channel defined by the receiver, which is determined by the address check in the receiver. In this case, the return information to the transmitter is then changed (for example the lamp is switched off) in such a way that the operator knows that the actual transmission mode (transmission of control commands) can now begin.

Eine weitaus komfortablere, aber schaltungstechnisch auch aufwendigere Version besteht darin, die Rückmeldeinformation des Empfängers an den Sender so zu gestalten, daß auch die Frequenz des als frei ermittelten Kanals (oder eine entsprechende kodierte Information) dem Sender mitgeteilt wird und dann der Sender automatisch den Sendekanal entsprechend dieser Information einstellt.A much more comfortable, but also technically more complex version is to design the feedback information of the receiver to the transmitter so that the frequency of the channel determined as free (or a corresponding coded information) is also communicated to the transmitter and then the transmitter automatically the transmission channel according to this information.

Die Rückmeldung an den "Sender" kann z. B. dadurch erfolgen, daß der Sender auch mit einem Monitor-HF-Empfangsteil ausgestattet ist, das durch eine Scannereinrichtung, wie oben beschrieben, das Rückmeldesignal des "Empfängers'' sucht und sich darauf einrastet.The feedback to the "transmitter" can, for. B. done in that the transmitter is also equipped with a monitor RF receiving part, which searches for the feedback signal of the "receiver" by a scanner device, as described above, and engages thereon.

Beide Varianten der Betriebsart gemäß Figur 3 erfordern naturgemäß mehr oder weniger aufwendige Sendeeinheiten beim Empfänger bzw. Empfangseinheiten beim Sender, um den Rückmeldeweg zu ermöglichen.Both variants of the operating mode according to FIG. 3 naturally require more or less complex transmitter units at the receiver or receiver units at the transmitter in order to enable the feedback path.

Claims (3)

Verfahren zur Herstellung einer störungsfreien Funkverbindung durch Austausch von Telegrammen zwischen dem Empfänger und dem Sender einer Fernwirkanlage, wozu die Frequenz des Empfängers oder Senders weitergeschaltet werden kann, wenn die Auswertung eines kanalspezifischen Teils des Telegramms (Telegrammadresse) die Nicht-Übereinstimmung von Sendefrequenz und Empfangsfrequenz ergibt (Kanalabfrage),
dadurch gekennzeichnet, daß das Squelch-Signal des HF-Teils des Empfängers auf Vorliegen eines HF-Signals auf dem eingestellten Kanal des Empfängers abgefragt wird und die Weiterschaltung der Empfangsfrequenz des Empfängers und die Auswertung der Telegrammadresse (Kanalabfrage) in Abhängigkeit davon erfolgen, ob der Wert (high/low) des Squelch-Signals das Vorliegen eines HF-Signals mit der eingestellten Frequenz anzeigt.Method for establishing a interference-free radio connection by exchanging telegrams between the receiver and the transmitter of a telecontrol system, for which the frequency of the receiver or transmitter can be switched on if the evaluation of a channel-specific part of the telegram (telegram address) results in the mismatch between the transmission frequency and the reception frequency (Channel query),
characterized in that the squelch signal of the RF part of the receiver is queried for the presence of an RF signal on the set channel of the receiver and the switching of the receiving frequency of the receiver and the evaluation of the telegram address (channel query) take place depending on whether the Value (high / low) of the squelch signal indicates the presence of an RF signal with the set frequency. Anwendung des Verfahrens nach Anspruch 1 beim Umschalten des Senders auf eine neue Sendefrequenz, wozu die Weiterschaltung der Empfangsfrequenz des Empfängers zur Sendersuche sofort und ohne Auswertung der Telegrammadresse erfolgt, solange die Auswertung des Squelch-Signals ergibt, daß kein HF-Signal am Empfänger anliegt, und erst bei Vorliegen eines HF-Signals die Kanalabfrage durch Auswertung der Telegrammadresse erfolgt.Application of the method according to claim 1 when switching the transmitter to a new transmission frequency, for which purpose the reception frequency of the receiver is switched on immediately for searching the transmitter and without evaluating the telegram address, as long as the evaluation of the squelch signal shows that there is no RF signal at the receiver, and the channel is queried by evaluating the telegram address only when an HF signal is present. Anwendung des Verfahrens nach Anspruch 1 zur Suche eines störungsfreien Funkkanals bei gestörter Funkverbindung, wozu bei abgeschaltetem Sender die Weiterschaltung der Empfangsfrequenz des Empfängers zur Suche eines freien Kanals so lange durchgeführt wird, bis die Auswertung des Squelch-Signals ergibt, daß kein HF-Signal am Empfänger anliegt und nach Übermittlung eines Signals an den Sender dann die Kanäle des Senders so lange weitergeschaltet werden, bis die Auswertung der beim Empfänger eintreffenden Telegrammadressen des Senders ergibt, daß die Sendefrequenz des Senders mit der gefundenen freien Frequenz übereinstimmt.Application of the method according to claim 1 for the search for an interference-free radio channel in the event of a disturbed radio connection, for which purpose the switching of the receiving frequency of the receiver to search for a free channel is carried out with the transmitter switched off until the evaluation of the squelch signal shows that no RF signal on Receiver is present and after transmission of a signal to the transmitter, the channels of the transmitter are then switched on until the evaluation of the telegram addresses of the transmitter arriving at the receiver shows that the transmission frequency of the transmitter matches the free frequency found.
EP93107065A 1992-05-02 1993-04-30 Method for obtaining a disturbance-free radio-communication Expired - Lifetime EP0568938B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4214627A DE4214627C1 (en) 1992-05-02 1992-05-02 Procedure for channel polling by the receiver of a telecontrol system
DE4214627 1992-05-02

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EP0568938A1 true EP0568938A1 (en) 1993-11-10
EP0568938B1 EP0568938B1 (en) 1997-10-15

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JP (1) JPH0698375A (en)
AT (1) ATE159368T1 (en)
AU (1) AU3832193A (en)
CA (1) CA2095283A1 (en)
DE (2) DE4214627C1 (en)
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US6634461B1 (en) 2002-06-10 2003-10-21 Gray Automotive Products, Inc. Coordinated lift system
US7219770B2 (en) 2003-08-01 2007-05-22 Baker William J Coordinated lift system with user selectable RF channels
US9334145B2 (en) 2012-03-19 2016-05-10 Gray Manufacturing Company, Inc. Velocity controlled wireless vehicle lift system

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DE19705502B4 (en) * 1997-02-13 2009-11-05 Wolfgang Brendel Radio remote control system
DE102005056933A1 (en) * 2005-11-29 2007-05-31 Prof. Dr. Horst Ziegler und Partner GbR (vertretungsberechtigter Gesellschafter: Prof. Dr. Horst Ziegler 33100 Paderborn) Radio transmission system

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DE3010068A1 (en) * 1980-03-15 1981-09-24 Fried. Krupp Gmbh, 4300 Essen Data transmission system between beacon and vehicle - uses transmitter and receiver for optical radiation with modulated HF carrier signals
BE894769A (en) * 1982-10-21 1983-02-14 Theimeg Elektronikgerate G M B TDM carrier transmission system for order telegrams - operates over single HF channel between different transmitting and receiving stations and uses timer actuating transmitter
BE894768A (en) * 1982-10-21 1983-02-14 Theimeg Elektronikgerate G M B Preferential TDM carrier transmission system for order telegrams - uses priority identification switch in conjunction with AND=OR logic gates liberating transmitter function

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059284A2 (en) * 1998-05-11 1999-11-18 Robert Bosch Gmbh Message transmission in a radio-based system for security or access control and method therefor
WO1999059284A3 (en) * 1998-05-11 2000-01-20 Bosch Gmbh Robert Message transmission in a radio-based system for security or access control and method therefor
US6634461B1 (en) 2002-06-10 2003-10-21 Gray Automotive Products, Inc. Coordinated lift system
US7014012B2 (en) 2002-06-10 2006-03-21 Gray Automotive Products, Inc. Coordinated lift system
USRE41554E1 (en) * 2002-06-10 2010-08-24 Gray Manufacturing Company, Inc. Coordinated lift system
US7219770B2 (en) 2003-08-01 2007-05-22 Baker William J Coordinated lift system with user selectable RF channels
US9334145B2 (en) 2012-03-19 2016-05-10 Gray Manufacturing Company, Inc. Velocity controlled wireless vehicle lift system
US9352944B2 (en) 2012-03-19 2016-05-31 Gray Manufacturing Company, Inc. Control and communication system for a wireless vehicle lift system
US9656843B2 (en) 2012-03-19 2017-05-23 Gray Manufacturing Company, Inc. Wireless vehicle lift system with enhanced electronic controls
US10059576B2 (en) 2012-03-19 2018-08-28 Gray Manufacturing Company, Inc. Wireless vehicle lift system with enhanced electronic controls
US10214403B2 (en) 2012-03-19 2019-02-26 Gray Manufacturing Company, Inc. Wireless vehicle lift system with enhanced electronic controls
US10457536B2 (en) 2012-03-19 2019-10-29 Gray Manufacturing Company, Inc. Vehicle lift system with adaptive wireless communication
US11383964B2 (en) 2012-03-19 2022-07-12 Gray Manufacturing Company, Inc. Wireless vehicle lift system with enhanced electronic controls
US11643313B2 (en) 2012-03-19 2023-05-09 Gray Manufacturing Company, Inc. Wireless vehicle lift system with enhanced electronic controls
US12037229B2 (en) 2012-03-19 2024-07-16 Gray Manufacturing Company, Inc. Wireless vehicle lift system with enhanced electronic controls

Also Published As

Publication number Publication date
AU3832193A (en) 1993-11-04
JPH0698375A (en) 1994-04-08
ATE159368T1 (en) 1997-11-15
DE4214627C1 (en) 1993-12-09
EP0568938B1 (en) 1997-10-15
CA2095283A1 (en) 1993-11-03
TW238445B (en) 1995-01-11
DE59307526D1 (en) 1997-11-20

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