DE2362079A1 - INQUIRY DEVICE - Google Patents

Description

Patent attorney DIPL.-PHYS. DR. W. LANGHOFF Attorney 3. LANGHOFF *

MUNICH 81 ■ WISSMANNSTRASSE 14 · TELEPHONE S32774 · TELE® RAMM ADDRESS: LANGHOPFPATENT MUNICH

Munich, December 11, 1973 Our reference: 45 -

Raymond Bordier, 2, rue Faidherbe, F-75011 PARIS.

Interrogation device

The invention relates to a retrieval apparatus with a central station and a number separated from each other lying, so that flow-connected receiver _s wherein the interrogator short, cyclically successive interrogation signals sends information processing in the central station of the retrieved from the receivers data whose number at least equals the number of connected receivers is, and sends out corresponding response signals, which corresponds to a constant, predetermined current strength for each level of information transmitted to the central station, which are set so weak that no mutual interference can occur between the lines, and with devices for converting these direct current signals into proportional voltage signals and for Separation of these voltage signals by amplitude discriminator circuits.

A device is already known in which the response signals sent out by second stations are stored in a central device a constant ^ predetermined direct current on the transmission line for each level of the information to be transmitted and in which the transmitted current signals in proportional voltage signals that are separated from each other by

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Araplitude discrimination can be separated as a function of the information level.

In this known device, the interrogation signals are transmitted cyclically with a fixed sequence, and the central station comprises a shift register and a memory into which the information of the shift register is only transferred when the number of response signals received is equal to the number of recipients. However, it is an auxiliary circuit required to generate supplementary signals, i.e. they can take the place of the missing interrogation signals, Each piece of information is in the position assigned to the corresponding recipient at the time of storage is located.

The invention "is based on the object of creating an interrogation device of the type mentioned above, which has a simple structure and enables fault monitoring without the need for dead times.

The solution to the problem is to be seen in the fact that the circuit for generating the interrogation signals is a trigger circuit for has a new interrogation cycle, each of which only depends on the response signals actually transmitted to the central station is triggered.

According to a preferred embodiment, the trigger circuit comprises a monovibrator that is triggered by each of the response signals and has a switching duration that at least equal to the interval between two consecutive ones Response signals is, and includes an interrogation signal generator generated by the falling edge of the switching pulse of the monovibrator is triggered.

Another advantage of the invention is that all of the response signals are sent to a decimal counter.

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j is the leader. are each connected to a decoder which one of the number of receivers corresponding number of storage control _fl which are acted upon by the voltage signals after passing through the Amplitudendiskriminatoren.

Another feature of the invention is that the circuit comprises a second monovibrator derived from is triggered by the last response signal of each cycle and has a switching duration that is longer than that Switching duration of the first monovibrator, and a memory which contains the switching pulse of the second monovibrator stores and is activated by the interrogation signal of the next cycle, and a warning signal generator, the one Interruption in the corresponding state in the response signal sequence indicates.

The invention is additionally described below with reference to schematic drawings using an exemplary embodiment.

Figure 1 is a block diagram of a preferred embodiment the invention.

Figure 2 shows graphs of the signals at various Set the circuit.

The circuit shown in Figure 1 comprises a monovibrator 1, the cyclically a pulse b of fixed Sends duration and a pulse shaping circuit 2 controls, which via a power line 3, which a central station with Receiving stations connects, reaches a first recipient * J, which is switched so that it simultaneously transmits an interrogation pulse to the receiver 5 connected downstream and a response pulse g on line 7 back to the central station. The receiver 5 also sends the same: timely an interrogation pulse of the receiver 6 and one

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Response pulse along line 7. Although only three receivers are shown, the number is the same not limited.

The current impulses g are ir? Converted voltage pulses at a resistor's bridge 8, which acts as a load on the line 7 is switched on. The latter is also connected to the input of a trigger 9 »of a threshold value triggering circuit, which emits pulses h of a fixed height. The threshold value of the trigger 9 is set so that interference signals do not trigger the same and that the totality of the response impulses are brought into a form which is normal Corresponds to the work of the queried recipient or not.

A further trigger circuit 10 is connected to a tap on the resistance bridge 8 and is set to a threshold value is set, which is only exceeded when the response pulses reach a level that is significantly higher than that corresponding to the normal function of the queried recipient.

The trigger circuit sends out pulses k. The pulses h arrive on the one hand at a first path for generating a new interrogation pulse and on the other hand on a second way for information processing. The first way involves one Monovibrator 11, which has a time constant which is greater than the interval between two pulses h and the at every new pulse h is triggered again. From the last pulse onwards, the square-wave pulse generated by the monovibrator has j thus a period of time which is equal to the switching state of the monovibrator. The square pulse j thus begins on the falling edge of the first pulse h and triggers the monovibrator 1 at the time of its own falling edge, what causes a new polling cycle. Figure 2 shows three consecutive cycles n-2, n-1 and n,

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The length of a cycle obviously depends on the Number of responses received, why it is also shorter in cycle n-2 than in cycle n-1.

In order to determine that there was no interruption in the sequence of interrogation pulses sent from one receiver to the next, that is, that the last receiver β sent an interrogation pulse e, the corresponding output of this receiver is connected to the input of a trip circuit 13 via a line 12 . The leading edge of the calibrated pulse f, which was sent out by the trigger circuit 13, triggers a monovibrator Ik " from which the reversed square-wave pulse a is used. This square-wave pulse, the duration of which is greater than the switching state of the monovibrator 11, is passed to a memory 15 which is activated by the pulse b emanating from the monovibrator 1. Depending on whether a pulse e has occurred in the course of a specific cycle or not, the memory 15 stores the value 0 or the value 1.

An alarm system is provided with an amplifier Io and a warning light system 17, which signals state 1 of memory 15. In Figure 1, cycle n-1 ", in which the answer g of the third recipient is missing. State 1 is then in the memory 15 is stored during cycle η, and an alarm is given at the beginning of this cycle, which is indicated by the waveform 17a is shown.

The second way, which is used for information processing, comprises a monostable circuit 18, which sends out pulses i, whose leading edge is synchronous with the leading edge of the pulses h, and whose duration is about half as long.

These shorter pulses arrive at the input of a counter

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for two decades 19, 20. The outputs A, B, C and D of the Decades are connected to decoders 21 and 22, in each of which only one of 10 outputs is activated. The decoder 21 corresponds to the units of a digit, and the decoder 22 corresponds to the tens of the digit. at In the illustrated embodiment with three receivers, only the decade counter 19 and the decoder 21 are necessary.

The outputs of the decoders are each connected to an input of all of ten gates 23, their outputs each with a clock input of an assigned memory 24 are connected. When a pulse g is received, only the memory activated whose rank corresponds to that of this pulse (curves 1, m and n). The input for the storage data is connected to the output of the trigger circuit 10 and receives the impulses k indicating an error. the Hence, the successive responses give impulses successively and in the same cycle the corresponding memory 24 in the state 1 or 0, depending on whether the Pulses are error pulses or not. At the beginning of each new cycle, the counter is activated by the signal b on the Line 19 a set to zero. Every memory output is connected to an alarm system, for example, an isolation amplifier 27, a warning signal generator 28 and a Differentiating circuit 26 includes. The latter only sends the state i of the memory to the warning signal generator, via a Diode 29. When indicator 25 lights up, which indicates an interruption in the response sequence, this will also be Bells 28 automatically via the differentiating circle 2o, 29 and a corresponding differentiating circuit 30 energized.

When the switch 39 is in position 1, the pulses k are passed on to the memory.

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In position 2 of switch 39, the inputs for the memory data are connected to ground. If the memory work correctly _s must therefore fall automatically all Indicator.

In position 3 of switch 39, the logic level 1 is applied to the memory inputs of all memories, so that then address all indicators 25.

In the graphs 17a ₈ 25-la _t 25-2a and 25-3a, the switch-on states corresponding to level 1 and the switch-off states corresponding to level 0 are marked.

The light signal 17 illuminates during cycle n-2, da assume that there is no signal e during cycle n-3. Glows for the same reason the light signal during the cycle η.

The device according to the invention allows a simple Way of detecting errors as soon as they occur and activating an alarm system. In addition, can the monitoring of the device can be carried out more quickly, since it is necessary between the individual successive interrogations there is no more dead time.

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Claims (2)

Claims Interrogation device with a central station and a - number of separated from each other, thus line-wise connected receiver for information processing in the central station of the interrogated by the receivers Data, the interrogation device sending out short, cyclically successive interrogation signals, the number of which is at least equal to the number of connected receivers, and corresponding response signals sends out, the for each transmitted to the central station information level of a constant, predetermined Corresponds to current strength, which are set so weak that no mutual interference may occur between the lines, and with means for converting these DC signals into proportional voltage signals and to separate these voltage signals by amplitude discriminator circuits, characterized in that the circuit for generating the interrogation signals is a trigger circuit for a new polling cycle, which in each case only actually sent to the central station • transmitted response signals is triggered. 2. Interrogation device according to claim 1, characterized in that the trigger circuit comprises a monovibrator which is triggered by each of the response signals and has a switching duration that is at least equal to the interval between two successive response signals, and an interrogation signal generator includes, which is triggered by the falling edge of the switching pulse of the monovibrator. 409832/0685 BAD ORiGiNAL Interrogation device according to Claim 1 or 2, since d u r c characterized in that all of the response signals are sent to a decimal counter which are each connected to a decoder which has a number of Control memories that are based on the voltage signals Passing through the amplitude discriminators are acted upon. ' Interrogation device according to claim 3 »characterized by a second monovibrator, which is triggered by the last response signal of each cycle and has a switching duration that is longer as the switching duration of the first monovibrator, by a memory that stores the switching pulse of the second monovibrator saves and is activated by the interrogation signal of the next cycle and by a warning signal generator, which indicates the state corresponding to an interruption in the response * signal sequence. 'AO9832 / 06 86