SU746669A2 - Device for transmitting remote measurements - Google Patents

Description

(54) DEVICE FOR TRANSMITTING TELEVISION MEASUREMENTS

one

The device belongs to the field of telemechanics and can be used: Vano in telemetering systems, radio telemetry, long-distance communication, where it is necessary to reduce the amount of information.

. According to the main author. swith No. 423158, a device for transmitting telemetry is known. It contains information sensors in each channel, connected to adaptive time samplers (AVDs) and keys, elements AND, input of the first of which are connected to corresponding outputs of the AVD and pulse distributor, and outputs - with keys. The inputs of the second elements And are connected respectively to the inputs of the circuit for determining the address, element OR, the starting circuit and with the output of the reading unit, and the outputs are connected to the second inputs of the AED. The device also contains an analog-to-digital converter (ADC), the input of which is connected to the keys of each channel, and the outputs to the inputs of the reading unit, a pulse generator connected through the trigger circuit to the pulse distributor, the unit whose outputs are connected to the inputs of the AVD, and

A circuit for determining the number of the quota whose inputs are connected to the outputs of the first elements And and the inputs of the second elements And, and the outputs are connected to the inputs of the setting block.

In the known device, when several AEDs are triggered during a single polling cycle, the quota number determination circuit includes another setpoint,

10, with an increase in the number of orders in the queue, the setpoints increase. The signal at the AED output remains only in those channels whose approximation error is greater than the new setpoint.

The disadvantage of the prototype is the possibility of complete absence of information from few active channels.

20 with relatively high load

systems, which in some cases makes it difficult for consumers to use information. This situation may also arise in the event of a malfunction.

25 AED of any channel.

The aim of the invention is to obtain information from few active channels at the required points in time, i.e. functional expansion

30 device capabilities.

This goal is achieved by introducing into the device a counter, additional elements AND, a meter switching unit, a waiting multivibrator and a code comparison unit, one inputs of which are connected to the outputs of the address determination circuit, other inputs and the first inputs of the meter switching unit are connected to the outputs of the counter-: second, second the inputs of the meter switching unit are connected to the additional outputs of the pulse distributor, the auxiliary inputs of which are connected to the outputs of the meter switching unit, the output of the code comparison unit and you the reading unit stroke is connected to the inputs of the first additional element And the output is connected to the counter input and through the waiting multivibrator with the first input of the second additional element AND, the second input is connected to the output of the OR element, the output is connected to the third input of the counter switching unit.

Due to this construction, the input signals that have not been interrogated for a long time are forcibly transmitted to the communication channel. The maximum time between polls is determined by the Pending Multivibrator. .

The structural scheme of the proposed device for the transmission of telemetry is shown in the drawing.

The device contains sensors 1 for converting information from an object into an electrical signal, AVD 2 for generating adaptive sampling signals, and elements 3 for developing: and coincidence signals. Keys 4 are used to connect sensors to an ADC 5 that converts analog signals to code. A 6-pulse generator with a start-up circuit 7 ensures the operation of a 5-pulse de-puller with 8 pulses, which serves for the sequential polling of elements, FROM. Elements And 9 are designed to generate pulses AVD, and the element OR 10 - to generate signals that prohibit the passage of pulses from the generator 6 to the distributor 8 pulses through the circuit 7 start. The circuit 11 for determining the number of applications in a queue is designed to generate setpoint switching signals that are generated by the setpoint unit 12. The address determination circuit 13 is intended to convert a selectable sensor number to a code. The read unit 14 is used to convert the parallel information code and address into a serial one and transfer it to the communication channel, as well as to generate a reset signal A1 SCH and a pulse enable signal from the generator to the distributor through the trigger circuit.

Distributor 8 pulses consisting of a counter 15 and a decoder 16.

Counter 17 is used to form the code for the address of the monitored channel. The code comparison unit 18 serves to generate a signal to interlock the codes from the counter 17 and the address determination circuit 13. The waiting Multivibrator 19 is designed to work out the maximum possible time interval between samples of one channel. This interval is defined as dynamic properties.

  input signals, and the requirements of the consumer information. The meter switching unit 20 serves to connect a distributor of 8 pulses to the decoder of the counter 15 (with

5 to the correct operation of the device), or counter 17 (when the maximum possible time interval between the counts of the monitored channel is reached). Elements And 21 serve to generate control signals for block 20. and blocks 17 and 19.

The device works as follows.

The sensor signals 1 are received on.

5 AED 2, to the second inputs of which a setpoint voltage is applied, proportional to a certain value of the approximation error. If in any channel the error of the approximation reaches a predetermined value determined by the setpoint, then the output of the corresponding AVD 2 is signal 1. At the same time, the pulses from the generator 6 through the open circuit 5 - by the distributor 8 their pulse pulses alternately elements 3 and 3. If signal 1 appears at the second input of any element 3, then this element is triggered, and the key 4 of this channel is opened, connecting the corresponding sensor to the ADC 5. At the same time, through element OR 10, circuit 7 is fed signal prohibiting g lneyshee passage of pulses from the generator 6 to the completion of the conversion and outputting the code in a communication channel. At the same time, signals from this element AND 3 are sent to the address determination circuit 13 and to one of the inputs

0 cops And 9 .. The code of the number of the corresponding sensor and the code of the parameter are sent to the reading unit 14, which converts the pair code into a serial one and sends it to the channel

. connection. Upon completion of the readout, unit 4 outputs a pulse for resetting the ADC 5, allowing further passage of pulses from the generator through the start circuit 7 to the distributor 8 and to the second input of the And 9 element,

0 resets this AVD 2.

After that, the distributor 8 continues to poll the elements 3, and the passage of the channel, jKOTOporp approximation error is less

5 specified, chosen less than the time of signal conversion and issuing a code to the communication line. Thus, from the ADC 5 only those sensor signals are received, the approximation error of which is larger than the specified one.

The ttpvt operation of several LVD 2s during a single cycle triggers the number 11 detection scheme and switches on a new, larger setpoint. The signal at the output of the AVD 2 remains only in those channels, the error of which is the approximation of the signals which are larger than the new setpoint. With atsm, the number of orders decreases, and first kangsha with large values of the approximation error are polled. Thereafter, the quota number may decrease, and

The number-determination circuit of quotation 11 is triggered and switches the setpoint block 12 so that the setting decreases.

However, with the general high activity of the input signals, a situation may arise when a little active signal is not interrogated, which makes it difficult in some cases to use the information of this channel. To exclude this phenomenon, a control circuit consisting of blocks 17–21 has been introduced into the device. The monitoring is carried out sequentially, starting from any channel, depending on the initial state of the counter 17. The code from the output of the counter 17 is compared in the code comparison unit 18 with the code at the output of the address determination circuit 13. If for max1 (the minimum possible time determined by multivibrator 19 at the output of circuit 13 is a code identical to that of counter 17, then the output of block 18 is signaled by switching through the first additional element 21 of counter 17 to the next channel for The switching of the counter 17 takes place simultaneously with the appearance of the start-up signal from the reading unit 14. At the same time, the multivibrator 19 is reset

. | initial state. If the time determined by the multivibrator 19 is not enough to generate a controlled kangsha code at the output of the circuit

13, the multivibrator 19 is triggered. The signal from the output of the multivibrator 19 through the second additional element I 21 acts on the block 20, the decoder 16 of the distributor 8 pulses; the counter 17 is connected instead of the counter 15, and the information and the address of the monitored cannon . After the end of the transmission, the counter 17 switches to the next position, the multi0 vibrator 19 is reset, and the counter 15 is connected to the di ф irator 16. Thereafter, the operation cycle is repeated. Thus, the proposed device allows to transmit information from the active channels (even from faulty channels) at specified intervals, determined by the usability of the information.

Claims (1)

Invention Formula Device for transmitting telemetry on aut. swith 423158, characterized in that, in order to expand the functionality of the device, a counter, additional AND elements, a counter switching unit and a waiting multivibrator, a code comparison unit, one inputs of which are connected to the outputs of the address determination circuit, other inputs and first inputs of the block, are introduced into it. switching counters are connected to the outputs of the counter, the second inputs to the additional outputs of the pulse distributor, the additional inputs of which are connected to the outputs of the switching unit of the counters, the output of the comparison unit codes and the output of the reading unit are connected to the inputs of the first additional element AND, the output of which is connected to the input of the counter and through the waiting multivibrator to the first input of the second additional element AND, the second input is connected to the output of the OR element, the output is connected to the third input of the counter switching unit.