FI61770C - ANORDNING FOER INFORMATIONSOEVERFOERING SPECIELLT LARMOEVERFOERING - Google Patents

Description

r.fftl .... advertisement publication, Λ nn <\ Wa [b] <11> utlAggningsskrift 61770 C Patent granted 10 09 1932 * (^) Patent medcJelat ^ ^ (51) K ».ik.3 / ic * cci. 3 G 08 C 15/06 FINLAND —FINLAND (21) P * Unttlh »k * mu * —Pttenttmeknlnj 701198 (22) HakwnltpUvt —Araaknlnx * d« g 29.Ol.76 (23) AlkupUvt — GHclgh «ttd« g 29 .OU.76 (41) Tullut julklMlul - Bllvlt oflvntllg 03.11.76

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Patent- och registerstyrelsen Amaku uthgtf och uti.ikrifton publkwrad 31.09.82 (32) (33) (31) Pyydetty «uoikou» —Boglrd prlorHut 02.05.75

Sweden-Sweden (SE) 7505111-0 (71) (72) Uno Tinglöf, Fack, 123 86 Farsta, Hans Lind, Fack, 123 86 Farsta, Tolly Hjelm, Fack, 123 86 Farsta, Lennart Lindblad, Fack, 123 86 Farsta , Gert-0ve Renström, Fack, 123 86 Farsta, Sweden-Sverige (SE) (7 ^) Oy Kolster Ab (5 ^) Device for data transmission, especially for alarm transmission -

Anordning för informationsöverföring, speciellt larmöverföring

The present invention relates to a device for transmitting information via a line, the operational reliability of which is constantly monitored. The apparatus comprises means for transmitting a plurality of time-separated frequencies and means for receiving, storing and comparing the frequencies.

Various alarm systems are previously known, and an alarm system close to the present invention is one in which information is obtained by activating a plurality of alarm sources, the alarm information of which is transmitted to a central monitoring device. The transmission itself takes place via the public transport network. The previously known alarm system has previously been disclosed in U.S. Patent 3,792,469.

However, it is obvious that the previously known system is complex in structure and thus expensive to use. However, it can be seen that the previously known system fulfills the purpose of providing a device in which the transmission line is constantly monitored for operational reliability while the device presents the possibility of being able to evaluate unique alarm information.

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The device according to the present invention is intended for transmitting information via a transmission line, and the device uses transmission means for transmitting a plurality of time-separated frequencies, as well as means for receiving, storing and comparing said frequencies.

It is an object of the present invention to transmit a plurality of time-separated frequencies to check the reliability of a transmission line, and for this purpose there are a plurality of frequency transmitting units, each controlled by a control device, so that said transmission line is allocated at different frequencies in a time division manner. in sequential order as a series, which means that after the last unit has shifted its frequency, the first unit starts transmitting its frequency again.

Another object of the present invention is to provide means that can convert a frequency into a data frequency that is unique and different from all other frequencies transmitted by the units when monitoring operational reliability, allowing a cheap and highly reliable system to be built.

Another object of the present invention is to receive all frequencies and to evaluate the changes of the data frequency by storing the previously received frequency series and the time periods of the frequencies and comparing them with the frequencies occurring during the data transmission itself.

The value of said information can be determined either by the time period or time periods in which the data frequencies occur, or by the lack of frequencies during one or more time periods.

Yet another object of the present invention is to provide a feedback circuit included in an oscillator which divides the input frequency of the oscillator into said different frequencies, so as to provide said control of operational reliability.

It is a further object of the present invention to provide a control device adapted to activate each frequency so that this frequency is transmitted during its own period of time.

The device according to the present invention is considered to be primarily characterized by what is stated below in the characterizing part of the following claim 1.

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The presently proposed embodiment showing the features of the present invention will be described in more detail with reference to the accompanying drawing, in which Fig. 1 shows a block diagram of the proposed embodiment, Fig. 2 shows a block diagram of a data transmitting device, and Fig. 3 shows a block diagram of a receiving device.

Referring to the block diagram of Fig. 1, it shows an apparatus for transmitting and transmitting data via a two-wire transmission line 1. This line 1 is provided with continuous monitoring of the reliability of the line, which takes place in such a way that the frequencies are always transferred in series from the transmitting device 2 to the receiving device 3.

Both devices 2 and 3 are connected to the line 1 via a transformer T.

The device 2 is adapted to transmit or transmit a plurality of time-separated frequencies in series to monitor the reliability of the line. For this purpose, the device 2 has a plurality of transmitting units "a", "b", "c" and "d", each of which is controlled by a control device or a unit Ue for allocating said wire in a time-division manner, all units being adapted to transmit their frequencies in sequential order from unit "a" followed by unit "b" followed by unit "c" and finally unit "d". When the last unit "d" has transmitted its frequency, the first unit "a" starts transmitting its frequency again.

Device 2 senses the potential present in lines 10, 11, 12, and 13. A positive potential normally occurs, and each line activates its relays R1, R2, R3, and R4. In these relay positions, no alarm information is transmitted.

However, when alarm information has to be sent, one of these four contact parts opens and the corresponding relay goes into the inoperative position. If the alarm detection device 40 moves the contact device 10a to the open position, the relay R1 is set to the inoperative position by opening the contact R1-1. If the alarm sensing device 43 moves the contact member 13a to the open position, the relay R4 sets to the inoperative position and opens its contact R4-1.

Figure 2 shows a transmission and transmission device 2 comprising a continuous first oscillator 01 adapted to produce a pulse indicating frequency of 1 MHz. These 4,61770 pulses are fed to pulse divider D in the form of a feedback binary output. Here, the divider has four feedback circuits, i.e. units with a previously known structure, and these are given the reference numerals "a", "b", "c" and "d". The divider is constructed to divide the frequency of the incoming pulses depending on the feedback circuits. When the feedback circuit "a" is activated, a frequency division occurs where the switching frequency of the oscillator is divided by a factor of 200. When the circuit "b" is activated, a frequency divided by a factor of 220 occurs, when the circuit "c" is activated, the frequency divided by a factor 240 is activated; there is a frequency divided by a factor of 260.

These frequencies occur at the output terminal "e" of said divider D when the corresponding feedback circuit is activated and thus form repetitive pulse trainings.

The transmitting device 2 also comprises a continuous control unit Ue. This unit Ue is fed by a second continuous oscillator 02. This unit Ue has four output terminals A, B, Ä, B, which are continuously activated in sequential order for a predetermined period of time. This unit comprises a rotating calculator with a low playback time. Each output terminal is connected to its feedback circuit or unit. Thus, output A is connected to circuit "a", output B is connected to circuit "b", output A is connected to circuit "c" and output B is connected to circuit "d". Said feedback circuits are activated only for the period of time produced by the corresponding output terminal.

As previously mentioned, the number of alarm-sensitive devices is four and activation of one of these devices causes the relay R1, R2, R3 or R4 to open. These devices are connected in parallel with the output terminal of the unit Ue.

When no information is provided, (in addition to monitoring the reliability of the transmission line) each relay, for example relay R1, must be located in the active position and supply current to the return circuit "a" via line 1a.

When information is given, which means the generation of alarm signals, relay R1 is inoperative and no potential is applied to the feedback circuit "a", which changes the frequency normally produced by the circuit "a" to a data frequency unique and different from all frequencies transmitted by the units.

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The loss of polarity due to 1a prevents the activation signal from the unit Ue from activating the feedback circuit "a".

In this situation, the feedback circuit "a" is adapted to adjust itself to a special and unique position in which the frequency is transmitted and the divider D activates said frequency by dividing the incoming control frequency by a factor 280.

It should be noted that it may be advantageous to prevent the occurrence of a frequency at the output terminal "e" during the data signal, which means the occurrence of a frequency-free time slot.

The operation of device 2 is as follows. Without the alarm information, the signals present at the output terminal "e" will be in the form of a frequency series. The total length and frequency duration of this series is determined by the unit Ue. The first frequency is 5000 Hz, the second 4500 Hz, the third 4100 Hz and the fourth 3900 Hz. This frequency sequence is repeated as long as no alarm information is sent.

However, when the alarm information is sent, the relay corresponding to the information is set to the inoperative position. In the embodiment, it can be assumed that relay R3 is in the inoperative position. This change in relay R3 also causes activation via line le to the feedback circuit "c", so that the activation signal of the output Ä of the unit, i.e. the control circuit, is not affected. During this time period, a frequency of 3500 Hz is transmitted via line 1. This frequency is received as alarm information and the time period during which this alarm frequency occurs is evaluated and this time period unambiguously determines which relay has moved to an inoperative position and which relay has been activated due to the alarm sensing device.

If the other relays go to an inoperative position due to their activation by an alarm sensor, said 3500 Hz signal will occur in other time periods.

The receiving device 3 comprises a receiver which feeds information to the storage device 31. In this storage device, the received signal set is compared with the previously received signal sets, and if the signal sets are identical, no alarm signal is produced. However, if the comparison shows a change in the frequencies of said sets, the indicating element 32 is input information about the time period during which the change of frequency took place.

If the frequency series does not occur at all in the receiving device '3, it means that such information has been given that the -jBi loose wire is not ready for transmission tasks.

Claims (4)

6 61770 An apparatus for transmitting information via a transmission line (1), the apparatus comprising continuous line reliability monitoring, comprising: (2) means for transmitting a plurality of time-separated frequencies and means (3) for receiving and storing said frequencies, characterized in for transmitting time-separated frequencies for monitoring the reliability of the line (1) comprises a plurality of transmitting units (a, b, c, d), these units being controlled by a control device (Ue) for allocating the line (1) in a time division manner and all units being transmitted in sequential order , which means that after the last unit has transmitted its frequency, the first unit will retransmit its frequency that the activating device (R1, R2, R3 or R4) can be activated by one or more units (a, b, c, d) to activate the unit to change the frequency to a data frequency that is unique and distinctive a of all other frequencies transmitted by the units during line reliability monitoring, that the receiving device (30, 31, 32) is intended to receive said frequencies and to evaluate each change in the data frequency by comparing previously received frequencies and their time positions with the frequencies during transmission; the value of said information is estimated by the time period or periods during which the data frequency occurs. Device according to Claim 1, characterized in that the transmission device comprises a frequency divider (D) with a plurality of feedback circuits which divide the supply frequency into a plurality of frequencies, and that each frequency is fed to the transmission line (1) during its own time period. Device according to Claim 2, characterized in that the control unit (Ue) is adapted to activate each feedback circuit in its own time period. Device according to Claim 1, characterized in that the data frequency is lower than the other frequencies.