Central to remote signalling system having counter controlled information transmission

2000 Hamburg, March 7, 1964

DR. E. WIEGAND BALUNDAMM 26

MÖNCHEN TELEPHONE: 330475 1 Δ. Q 7 ^ R Π

DIPL.-ING. W. NIEMANN '

H

° '°

UU

HAMBURG PATENTANWXLTi

Westinghouee Brake and Signal Company Limited, London (United Kingdom)

Scanning Infow.at.lons transmission system.

The invention relates to sampled information transmission systems, and more particularly to systems of the type in which a location of information units (itens) are scanned cyclically to be transmitted to one or more other locations.

One embodiment of the invention is one with sampling; operating information bursting station which scans an on-site counting device at which information units corresponding to each successive feed-in value are scanned for transmission to one or more other locations; one or more further groups of information units after the scanning of a group of information units by the counting device in response to applied continuation signals

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to the sample connected by the counting device, and having a device which transmits equal switching signals to the locations so as to hold an egg catching device provided on one or more of the others in the synchronizing circuit at the first location. :.

The invention will be described below with reference to the drawing, in which; Explanatory note 3 Explanatory note.

FIG. Fig. 1 illustrates in main form the main parts of a command station in an installation according to the invention. "

Fig. 2 illustrates in Fig. 3 Forhetic the main parts of an attachment provided in an installation according to the invention, which, in conjunction with In Figs. The command information reproduced can work.

The equipment to be described hereinafter is a continuously scanning remote control and / or remote display system of such a type in which the controls and displays are scanned to a Crt corresponding to the stepping of a count chain located at that location, to control or to display a number from remotely located further Crten to transfer. In the following, one location is to be called a command station, while the remaining locations are to be called outstations.

At the outstations, further counting chains are provided.

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which at the external stations allow a scan to be made in time with the scan being performed at the command station. It should be noted that in the example of the invention described herein, the control or display information units consist of information of one kind or another, ie from information that can be passed on or stored in a two-state device * "o the control information can for example be manually set to a plurality of two-position switches or to the external stations Registers that have rows of two-state devices at the command station and / or the outside stations are stored.

In the system to be described, the number of displays and controls is much larger than the length of the counting chain used to scan the information units either for tax purposes or for viewing purposes. Therefore, the count chains on the instruction status i & ee are used as a "full", one-full, scan cycle to perform the scanning of all transmitting or receiving information units. In this system, moreover, groups of rtouer or Anseige-Iiifox'niationseinheiten at the Kommandoπstation special / ußenstationen assigned, ie the groups are not divided between the outstations. However, it notes that an external

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station can also be assigned more than one group.

In the drawing, the display and control devices are not shown, and for the sake of simplicity, only the gates are used, which are used to select "the various information units" relating to the control or display devices.

It is assumed that the information transfer between the various stations is made via lead wires by means of frequencies on a frequency shift basis, as described in the Patentamieldung ...... (book number W.21142 / 64), thus saving Signal channels is achieved. The various stations interconnecting lines are also not shown in the drawing.

Optionally, the transmission can also be done wirelessly, although then a minor modification of the system is necessary_s in order to allow in the Oegensata to the listener-Boniaenen duplex operation of a Sissplextesiaelefe jsu. As soon as the operation stops, the outstations are driven by the received continuation impulse! B # ri a.ag ©, and at d @ i * nSext »Sampling aafew © rfe & t ate a $ j @ seized auöenstateoteei di © A * aßens.tatloii of ®ixi & m Sarthe

wlru sends in the & feetfeefeipipulse to get the Bgfehlsstatlan aasutreife ^ a »

The Isfshlsstation shown in Fig. 1 is with. #in frequency shift M 1 and a frequency shift »-

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The command station further comprises two counting chains 5 and 6, which are short compared to the number of information units to be scanned by them Each of these counting chains is connected to different rows of gates and intermediate registers. For reasons of understanding, only the components connected to the counting chain 5 will be described in detail since the components connected to the counting chain 6 are exactly the same.

For the purposes of the transmission of control information units, three rows of transmission gates are connected to the counting chain 5, of which the first row gates TG1. to TOl_n, the second row goals Τ02_χ to TG2_n and the third row goals TOJ₁ to TOJ_n includes. These gates, which are arranged above the counting chain 5, are with the stages "4" to^wThe first three stages of the counting chain are connected to a group of address gates, indicated by block A0 in Fig. 1. The outputs derived from these address gates identify the external station or group of memories in a given Auflenstation, which are supplied from the selected group of gates at the command station derived information units. The address is further determined by the controls derived from the selector circuit 4.

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to be guided ·

Connected to the receiver 2 and the counting chain 5 is a series of intermediate registers, which in FIG. 1 are connected by register stages TR₁ to TR_{n +}, are shown. It should be noted that there is a capacity for more information received than for information to be transmitted, displayed. This is usually required, and the remainder of the count chain stages can, as mentioned above, be used for the purposes of transferring address information.

Output lines from the various intermediate register stages mentioned above are connected to three associated rows of register gates. The first row includes goals RGl, to RGl -, the second series goals ROS₁ to ÜG2_{n ¥}^ and the third row gates RG ^₁ to ^ 3_{n ¥}y Each of these rows of gates is provided with a dispensing wire which receives dispensing property from the whirl circuit 4, inhibit gates IG1, IG2 and IG3, respectively, being provided to inhibit the operation of the register gates if one or more of them are being tested Tests are not satisfactory.

It should be noted that the above-mentioned transmission gates TG1, TG2, TG3 become operative in response to a signal received from the power current tower 4 and a signal obtained from the relevant stage of the counting chain 5 to connect the display information to the transmitter 1. It is further

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to notice that only one of the transfer gates is operated to a tent. The register gates work in groups, ie the group RGl or RG2 or RO? is responsive to a delivery signal received from the selector circuit ♦ to receive one in the series of intermediate register stages TR₁ to TR_{n +}to transmit temporarily held information to respective rows of final register stages not shown in the drawing. Of the intermediate register stages, only one is operated at a time in response to signals derived from the receiver 2 and from the counter chain 5.

The different transmission gates, intermediate register stages and register gates assigned to the second counting chain 6 are identical to the devices described with reference to the counting chain 5 and operate in the same catwalk as these.

Fig. 2 illustrates, as already mentioned above, only one Auflenstation, which can be used in conjunction with the reproduced in Fig. 1 command station, but it should be noted that a Hehrzahl AuSenstationen can be provided, each of which is connected to the single command station ,

The Auflenstation reproduced in Fig. 2 includes a counting chain 8, which has the same number of stages as the counting chains 5 and 6 of the In Flg. 1 reproduced command. Kit of each stage of the counting chain δ is a gate in each of two sets of transfer gates for the return from the Auflenstation to the command station

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display format connected. The one group of transmission gates covers gates TG4, to TG ^₁W ** u *¹⁰ d * © other group includes gates TG5, until TGS_{n +}- ,. As shown, these gates are all connected to a transmitter 9 represented by a block.

For reception at the outdoor station, it is provided with a receiver Io which is received from the command station. About transmissions anspriciit. A first output of the receiver Io provides timing pulses which are applied to the counter chain 8 as a port switching signal. A second output of the fin catcher is connected to a series of intermediate register stages TR2. to TR2₊, and a third output of the receiver is connected to a test circuit "11 represented by a block to provide therewith a signal corresponding to the end of each scan of the counter chain. Swing register stages TR2j to TR2_rh- are further associated with individual pedestrian gates, which are divided into two groups, from 'first the first group' gates RG4 to RG ^_n and the second. Group Goals HSS₁ to HG5_n includes.

Ie Ä us us ä ä & & & & ersten Sw Sw Sw Sw Sw Sw Sw - - - - - - - - - - - - - - - - - - - - - - -

An address decoder device 12, which responds to the information sent by the instruction station to supply the received information to the corresponding group of final register stages (if related to the external station concerned).

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The dispensing lines, which in this case are connected to the address decoding device 12, include, as shown, Inhlbit gates IG4 and IG5, which prevent dispensing appropria- tions from being applied to the end register gates when the test circuit 11 performs a check which is shown in FIG unsatisfactory.

The outputs of the address decorating device 12 are also connected to the above-mentioned groups of transfer gates TG4, TG5. This way is in the

Outstation has information on whether any group and, if it is the case, which group of display information units is to be transmitted over scans performed by the number string δ. For transmission of information from the outdoor station, the transmission gates TG4 and TG5 are connected in a similar manner to those at the command station to the frequency-converging transmitter 9 whose frequency band is different from that of the bender at the command station, but the same as for the other outstations.

For the operation of the system as a whole, the main pulse generator basically orders from a multivibrator circuit which generates a substantially symmetrical square wave form, and a differentiating and shaping circuit is provided which generates so-called stepping pulses for the counting chains in response to positive parts of the multivibrator output. In addition, the multi-

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- Io -

For the more negative half periods of the cultivator circuit, the transmitter output is switched to the state in which it transmits a mean frequency f, and for the more positive half periods of the multivibrator output the jender is brought to the state in which it has a frequency which is shifted to one side or the other side of the center frequency, depending on the information unit to be transmitted in the respective step of the scanning. An embodiment of a frequency-shifting transmitter suitable for this purpose is described in the aforementioned patent application and forms no part of the present invention.

To achieve the above result, the selector circuit 4 applies the continuation pulses derived from the above multivibrator to the counting chain 5 in the command station and the square wave output of the multivibrator to a selected group of preset transmission gates TO1 or TG2 or TGj5. It is assumed that the counter chain 5 should initially operate to transmit information units. At the same time, the selector circuit 4 provides signals to the two lines connected to the address gate circuit A0. These signals are derived from a counter provided in the v / counter circuit 4 which supplies to the address gate circuit such signals representing information representing a group of gates at a gate.

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Station Identifies to which information units corresponding to the selected transmission ports are to be transmitted.

In response to the applied port switching pulses, consecutive stages are changed in their state in the counting chain, which consists of successive connected stages of two-state utrom circles, so that pulses are applied to the relevant transmission gates. The transmission ports are therefore conditioned to cause the transmitter to transmit each frequency of the multivibrator during the respective second half-per-second to a frequency corresponding to the respective information units. In this Pail, the frequency is f2 or fJ5, which is on one or the other side of the above mean frequency fl. Due to the arrangement of the address gates and the gates transmitting the control information, the first three stages of the number string 5 in response to strobe pulses cause the transmission of the address information received from all the outside stations. The remaining stages of the counting chain (with the exception of the last stage indicating the end of the scan) generate Itapulses which are sent to the transfer gates corresponding to the respective stages, and the control information units are therefore scanned in succession until the end of the particular selected group is reached.

During the operation of the counting chain 5 In the

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station, as described above, the stage P on the command key is a continuation information interspersed with xrdt of display information which is generated from an outstation address previously addressed by the command station. Since this is so, the counting chain υ port switching pulses are supplied, which are derived from this information and ijbergiingen from the center frequency of the outdoor station transmitter correspond to one or the other Seitenfrequens. The counting chain 6 therefore conditions the two register registers to store the corresponding information units.

It should be noted that since there is no address to be received at the command station, three information units representing, for example, displays can be received more than the number of party information items transmitted on each count of the count strings From the last stage onwards, C is scanned, which indicates the end of the scan indicating the end of the scan. 7 and if the momentum indicative of #Insn-the-scan-nano-impulse, which is excited by the exciters '2', is also influenced by the stimulus 7, and @ut @ .t_s The chains of the troops, who were in command of the foreign stations, have remained behind₁Pant). If the lienirixsis (inhibit) is removed from the respective inhibitor ports, the miavelation stored in the biopsy register becomes an oer with the counting chain

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transmitted end register, which is selected based on the signal applied by the Withlerstrornkreis k. This information transfer normally extends to the next sample period.

It can be seen that, during the sampling by the counting chain 5, which occurs before the above mentioned, information units have normally been received from an outdoor station and in the intermediate registers TIL. to TH_{n +}- * the outdoor station is kept. If it is assumed that satisfactory checks of the synchronism have been made by the test circuit 7 during the just-described scanning of the counting chain 5, the output of these information units into the associated end registers has taken place via the control gates RG1, RG2 or RGJ as supplied by the controller circuit k getn't the previously selected Außenatationsadresse are selected. It will therefore be seen that as one of the counting chains scans to receive, the other counting chain scans to send out, and at the same time the information temporarily stored in the previous scan is output to the end registers.

As regards the operation of the outstation, it should first be noted that each outstation generally receives basic information sent by the command station, although if an outstation has only one number string, it can not receive it on two consecutive scans of the command station. so no

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Station is addressed in two consecutive scans. In the case of the installation according to the invention, the information in the form of alternating eyes is received by a frequency £ 2 or f J5, which reads on one side or the other of a mean frequency f 1, of which Vibration Intervals in Intermediate Samples Broadcast White. The continuation of the counting chain at the outstation is thus achieved by means of continuation pulses which are produced when detecting a transition of the received frequency from 1 * 1 to f2 or fJJ. The received pulses of frequency f 2 or f 2 are converted in a discriminator and decoder circuit into control waveforms which are sent to the dual gate registers, such as gates TR2j to TB2_{n ¥}External clockwork will be created.

The counter chain 8 shown in Fig. 2 therefore receives progress pulses from its enip receiver Io and is progressively indexed to produce outputs which contact the inter register gates TR2 through TR2, so as to respond to the received information waveforms. The first three units correspond, as already mentioned, to address information at the outstations, and the remaining units correspond to information units in the nature of controls from the command location. Dalier have at the end of the sampling of the counting chain 3 the stages ΤΗ2_χ Ms E ^_{n +}, an information saved »

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and those of the steps TR2j, TR2_G and TRS₃ stored information is directly available to the address decoding device 12, which, when recognizing the address code as a code corresponding to one of the register groups at the remote station, generates an output which conditions that of the groups of register gates RG4, RG5 which are for the received information is suitable. However, this conditioning, which is similar to the working state at the command station, is in turn dependent on the test circuit 11 having removed an inhibit from the line. This inhibition is eliminated under normal circumstances when the end of a sampling pulse derived from the final stage of the counting chain coincides with the. End of a received sampling pulse derived from the receiver and sent by the command station. Thus, then in the steps TR? ^ To TR2_{R +}, stored information units to the appropriate group of Endstufenstufen in the respective AuSenstation.

Since the transmission of the information from the intermediate registers in the command station and in the outstations, if relays are used, requires a certain amount of time comparable to the time required to perform an act on a counter chain, it is not possible immediately start another reception scan through the same counting chain, otherwise there is a risk that the information in the

8U98U2 0 3 2 3

• cistern is crushed before dl · present · Information EU of the corresponding final control stages. Aue dl ··· »Reason, as already mentioned, the two counting chains are used for alternating reception samples.

However, in general, only a single counting chain is present on each of the output stages, so that such an outside station can not receive two consecutive samples from the command station, but in a manner similar to that used in any counting chain at the command station an outstation to "transmit" information units during a scan * following a B-hop scan, which, therefore, recognizes address decoder bias 12 as directed to itself. Dl · »· transmission takes place over that drupe of transmission gates TO4 or TQ5, dl · corresponds to the received address. While such a transfer is taking place, the previously received tax breaks will be transferred to the Zwischheregietern TM to HU, thus transferring to the respective group of indexors RÖ4 or H05. Although this is shown in FIG. 9 The present invention, which contains a counting chain, prevents us from the just mentioned Oruad so as to prevent the creation of an efinalfinition, by eliminating the number of its increments for the automatic counting of the counting chain 8

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an identification of one of its own addresses by the address decoding device 12 follows.

The above-mentioned test circuits can not only act to prevent the transmission of information from the intermediate register stages to the final register stages, but they can be used as well. In the case of loss of synchronism between the counting string at the command station and the counting string at the outstation, a repeat scan the group of information units concerned, the scan being completely rejected and an alarm signal generated only if a given number of unsuccessful scans (eg, three) has been performed.

Although the aforementioned term "synchronism" assumes that the counting chains at the command station and at the remote stations can be in step, this is not true if the lines between the stations are so long that delays occur. Such delays are, however, practically constant for port switching and information signals on an external stator, and are therefore of no significance * since, in all cases, the Fjipfai disk is driven by the silent station.

In the embodiment of a plant according to the invention described above, it is assumed that each charging station is provided with only one counting chain. The · can usually be the Pail, but if it is desired

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If it is called by the instruction station after two consecutive addresses, then it may be provided with two counting chains arranged in a similar manner to the counting chains at the instruction station. As already stated above, the fact that a given outstation group is addressed on a sample of a group on the command keyboard provides sufficient information at the command station to cause the respective ports to be actuated for the received information on the next scan which comes from the same outstation and is to be applied to the respective register stages for display purposes,

Although it is assumed in the foregoing that the count chains at the command station for transmission are alternately operable to avoid delays in the scan due to the time required for the delivery of received information units to the command station. By providing a double dial-up circuit, it has been readily ensured that in the case of an alarm in one of the counters of the system, it will be able to continue reducing the GSM data rate, using only a totally intact counter chain. "This is also true for valves at the alarm stations Although, then, certain restrictions can be seen in the succession of events.

It should be noted that the selector circuit 4 in the first

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has not been described in detail "because such circuit can easily be provided by the person skilled in the art. Preferably, however, the waveform may be given to the selector circuit in the form of a binary counter which operates in response to sustaining pulses obtained from the main pulse generator J and provides output signals of predetermined values ​​so as to control the associated groups of gates during appropriate moments during the course Scanning the information units by the counting chains work · Usually the plant is designed so that it is a continuous cyclic Sampling of columnar units of information causes, however, that the scanning sequence may be interrupted or only a portion of which may be performed at any time "in which the operation of the selector stream 4 is modified" and "was either automatic in response to certain monitoring conditions of the equipment according to the invention or simply by manual control «

In certain applications of old sampling, it may be desirable for the transmission equipment of the type described herein to be available at another external station. In order to achieve this, "the receiver is required to receive information from another external station," a "further receiver and a separate frequency discriminator circuit" are provided

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1st «that he receives the external station frequencies. In addition, is an additional group of Eoipfangsreglsterstronikreisen planned in this outstation? and the enlightenment which is to "listen" to this station "must have a corresponding set of transmission gates" addressed by the instruction station during the previous scan of the count-string within it.

, When the outstations are to render representations of functions "wi push or liquid levels", groups of information units may be sited as binary digits in a digital representation of an analog of a size. In order to achieve this, an outstation may itself operate as an analogue value converting device of the type "in the successive comparisons of the analogue values ​​successively with standard values" in order to set up the digital output. This is accomplished by "using the outstation counting chain" to initiate each of the successive comparisons and apply the respective inputs to the coding circuit to "cause the transmitter" to apply the corresponding frequency to the stations and "each after the case, represent "an" l * or an "o". Since analog value-to-digital value conversion of this type is known, it does not need to be explained in more detail.

Although in the embodiment described above

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In accordance with the invention, a frequency-shifting carrier signal transmission system may be employed, such as other forms of transmission systems, such as those in which individual separate frequencies with associated channels are used for transmission and reception. Furthermore, a wireless transmission may be provided instead of a transmission by means of wires.

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