RU186467U1 - TRANSMISSION DEVICE FOR MANCHESTER CODING - Google Patents

Abstract

The utility model relates to the field of electronics, in particular, to devices for receiving and transmitting information via wire communication lines, the transmission code of which is the bipolar phase-manipulated Manchester-II code (Manchester code). The technical result of the claimed utility model is to increase noise immunity by blocking interference and control the correct transmission of signals. To achieve the specified technical result, the device contains a board including a synchronizer and N channels. The synchronizer contains a generator and a frequency divider, while the counting input of the frequency divider is connected to the output of the generator, the outputs of which are connected to the synchronizing inputs of each channel. Each channel contains an encoding device, a decoding device, a transmitting device, a receiving device, transformer galvanic isolation, a resistor and a capacitor. The encoding device comprises a shaper of normalized duration of information signals, a shaper of transmission duration and a phase-shifted (Manchester) code encoder. The decoding device comprises the first and second blocking drivers, a unit signal conditioner, a zero signal conditioner, a reset signal conditioner, a reception duration former and buffer elements. The input signals of ones and zeros are connected respectively to the first and second inputs of the generator of the normalized duration of information signals, the information output of which is connected to the input of the generator of the transmission duration and to the first input of the phase-shifted code encoder, and the synchronizing output is connected to the second input of the phase-shifted code encoder. The output of the transmission duration driver is connected to the third input of the phase-shifted code encoder, the direct and inverse outputs of which are respectively connected to the direct and inverse inputs of the transmitting device, the direct output of which is connected to the direct input of the receiving device and to the first output of the primary winding of the transformer galvanic isolation, and the inverse output is connected to the inverse input of the receiving device and to the second output of the primary winding of the transformer galvanic isolation. The third terminal of the primary winding of the transformer galvanic isolation, through a parallel connected resistor and capacitor, is connected to the common power circuit, the fourth and fifth conclusions of the secondary winding of the transformer galvanic isolation through protective resistors are connected to the communication line. The direct output of the receiving device is connected to the first input of the driver for the duration of the reception and to the first input of the driver of the signal of the units, and the inverse output is connected to the second input of the driver for the duration of reception and to the first input of the driver of the signal of zeros. The output of the driver of the duration of the reception is connected to the enable inputs of the driver of the signal of the units and the driver of the signal of zeros. The output of the unit signal shaper is connected to the first blocking shaper, to the first input of the reset signal shaper, and through the buffer element to the first channel output. The output of the zero signal driver is connected to the second blocking driver, to the second input of the reset signal driver, and through a buffer element to the second channel output. The output of the reset signal driver is connected to the zeroing input of the reception driver. The output of the first blocking driver is connected to the zeroing input of the zero signal conditioner, and the output of the second blocking driver is connected to the zeroing input of the units signal shaper.

Description

The utility model relates to the field of electronics, in particular, to devices for receiving and transmitting information via wire communication lines, the bipolar phase-manipulated Manchester-II code (Manchester code) is used as the transmission code.

A device for the formation, transmission and subsequent decryption of a linear signal (S. M. Sukhman, A. V. Bernov, B. V. Shevkoplyas. Synchronization in telecommunication systems. Analysis of engineering solutions. M .: Eco-Trends, 2003, p. 258-260), which contains the encoder, decoder and communication line code Manchester-II.

The disadvantage of this device is the lack of protection against interference arising in the communication line during transmission and reception of information. In addition, for the receiver to enter synchronism with the transmitter, it is necessary to create a transition from 0 to 1 on the transmitting side in the information signal.

A known serial interface transceiver with galvanic isolation element (RF patent No. 2511429 for an invention dated 07/19/2012) containing a transceiver, encoding and decoding device.

The disadvantage of this transceiver is the necessary presence of an input signal to set the decoder to its original state and additional inputs to set the threshold for the receiver.

A known system for duplex transmission of information over a two-wire communication line, selected as a prototype (RF patent No. 2381627 for the invention of 05/30/2006), containing a galvanic isolation element, an encoding and decoding device.

The disadvantage of this system is the low noise immunity due to the organization of the signal recovery circuit and power supply to the remote information receiving device via one communication line. In addition, this system does not block interference caused by the influence of transformers and imperfect coordination of the communication line.

The technical result of the claimed utility model is to increase noise immunity by blocking interference and monitoring the correct transmission of signals.

To achieve the specified technical result, the device comprises a board including a synchronizer and N channels. The synchronizer contains a generator and a frequency divider, while the counting input of the frequency divider is connected to the output of the generator, the outputs of which are connected to the synchronizing inputs of each channel. Each channel contains an encoding device, a decoding device, a transmitting device, a receiving device, transformer galvanic isolation, a resistor and a capacitor. The encoding device comprises a shaper of normalized duration of information signals, a shaper of transmission duration and a phase-shifted (Manchester) code encoder. The decoding device comprises the first and second blocking drivers, a unit signal conditioner, a zero signal conditioner, a reset signal conditioner, a reception duration former and buffer elements. The input signals of ones and zeros are connected respectively to the first and second inputs of the generator of the normalized duration of information signals, the information output of which is connected to the input of the generator of the transmission duration and to the first input of the phase-shifted code encoder, and the synchronizing output is connected to the second input of the phase-shifted code encoder. The output of the transmission duration driver is connected to the third input of the phase-shifted code encoder, the direct and inverse outputs of which are respectively connected to the direct and inverse inputs of the transmitting device, the direct output of which is connected to the direct input of the receiving device and to the first output of the primary winding of the transformer galvanic isolation, and the inverse output is connected to the inverse input of the receiving device and to the second output of the primary winding of the transformer galvanic isolation. The third terminal of the primary winding of the transformer galvanic isolation, through a parallel connected resistor and capacitor, is connected to the common power circuit, the fourth and fifth conclusions of the secondary winding of the transformer galvanic isolation through protective resistors are connected to the communication line. The direct output of the receiving device is connected to the first input of the driver for the duration of the reception and to the first input of the driver of the signal of the units, and the inverse output is connected to the second input of the driver for the duration of reception and to the first input of the driver of the signal of zeros. The output of the driver of the duration of the reception is connected to the enable inputs of the driver of the signal of the units and the driver of the signal of zeros. The output of the unit signal shaper is connected to the first blocking shaper, to the first input of the reset signal shaper, and through the buffer element to the first channel output. The output of the zero signal driver is connected to the second blocking driver, to the second input of the reset signal driver, and through a buffer element to the second channel output. The output of the reset signal driver is connected to the zeroing input of the reception driver. The output of the first blocking driver is connected to the zeroing input of the zero signal conditioner, and the output of the second blocking driver is connected to the zeroing input of the units signal shaper.

The utility model is illustrated by diagrams:

- FIG. 1 - Block diagram of a transceiver device of Manchester coding;

- FIG. 2 - Block diagram of the channel;

- FIG. 3 - Signals at various points in the circuit when transmitting unipolar code 10010.

In FIG. 1 shows:

- transceiver device of Manchester coding;

- synchronizer;

- generator;

- frequency divider;

- channels 1, 2, 3 ... N.

The Manchester coding transceiver comprises a board including a synchronizer and channels 1, 2, 3 ... N. The synchronizer contains a generator and a frequency divider, while the counting input of the frequency divider is connected to the output of the generator, the outputs of which are connected to the synchronizing inputs of channels 1,2, 3 ... N.

In FIG. 2 shown:

- 1 - shaper of the normalized duration of information signals;

- 2 - shaper transmission duration;

- 3 - phase-shifted (Manchester) code encoder;

- 4 - transmitting device;

- 5 - the first lock driver;

- 6 - second blocking driver;

- 7 - signal shaper units;

- 8 - shaper of a signal of zeros;

- 9 - reset driver;

- 10 - shaper duration of admission;

- 11 - receiving device;

- 12, 13-buffer elements;

- 14, 15- protective resistors;

- 16 - input signal units;

- 17 - input signal of zeros;

- 18 - information signal shaper normalized duration of information signals 1;

- 19 - the synchronizing signal of the driver of the normalized duration of the information signals 1;

- 20 - signal transmission duration;

- 21 - direct signal of the encoder phase-shifted code 3;

- 22 - inverse signal of the encoder phase-shift code 3;

- 23 - direct signal of the receiving device 11;

- 24 - inverse signal of the receiving device 11;

- 25 - output signal of units;

- 26, 28 - output blocking signals;

- 27 - output signal of zeros;

- 29 - reset output signal;

- 30 - output signal of the duration of reception;

- 31 - the first output of the channel;

- 32 - the second output of the channel;

- 33 - output protection signal;

- 34 - resistor;

- 35 - capacitor;

- transformer galvanic isolation;

- communication line.

Each channel contains an encoding device, a decoding device, a transmitting device 4, a receiving device 11, a transformer galvanic isolation, protective resistors 14.15, a resistor 34 and a capacitor 35.

The encoding device comprises a shaper of normalized duration of information signals 1, a shaper of transmission duration 2, and a phase-shifted (Manchester) code 3 encoder.

The decoding device comprises a first 5 and a second 6 blocking shapers, a signal shaper of units 7, a signal shaper of zeros 8, a shaper of a reset signal 9, a shaper of a reception duration and buffer elements 12, 13.

The input signal of units 16 and the input signal of zeros 17 are connected respectively to the first and second inputs of the generator of the normalized duration of information signals 1. The information output of the generator of the normalized duration of information signals 1 is connected to the input of the driver of the duration of transmission 2 and to the first input of the encoder phase-shifted code 3. Synchronizing output of the generator normalized duration of information signals 1 is connected to the second input of the encoder phase-shifted code 3. Output the transmission duration decoder 2 is connected to the third input of the phase-shifted code encoder 3. The direct and inverse outputs of the phase-shifted code encoder 3 are respectively connected to the direct and inverse inputs of the transmitting device 4. The direct output of the transmitting device 4 is connected to the direct input of the receiving device 11 and to the first output of the primary winding transformer galvanic isolation. The inverse output of the transmitting device 4 is connected to the inverse input of the receiving device 11 and to the second terminal of the primary winding of the transformer galvanic isolation. The third terminal of the primary winding of the transformer galvanic isolation, through a parallel-connected resistor 34 and a capacitor 35, is connected to a common power circuit. The fourth and fifth conclusions of the secondary winding of the transformer galvanic isolation through protective resistors 14, 15 are connected to the communication line. The direct output of the receiving device 11 is connected to the first input of the driver of the duration of reception 10 and to the first input of the signal conditioner of units 7. The inverse output of the receiving device 11 is connected to the second input of the driver of signal duration 10 and to the first input of the signal conditioner of zeros 8. The output of the driver of reception time 10 is connected to allowing inputs of the signal shaper of units 7 and the shaper of the signal of zeros 8. The output of the shaper of units 7 is connected to the first shaper of blocking 5, with the first input of the shapers of Tell reset signal 9 and through the buffer member 12 to the first outlet channel 31. The output of the zero signal shaper 8 is connected to the second blocking shaper 6, with the second input of the reset signal shaper 9 and through the buffer element 13 with the second 32 channel output. The output of the reset signal conditioner 9 is connected to the zeroing input of the shaper of reception duration 10. The output of the first blocker 5 is connected to the zeroing input of the zero signal shaper 8, and the output of the second blocker of 6 is connected to the zeroing input of the signal shaper of units 7.

In FIG. 3 shows:

- 16 - input signal units;

- 17 - input signal of zeros;

- 18 - information signal shaper normalized duration of information signals 1;

- 19 - the synchronizing signal of the driver of the normalized duration of the information signals 1;

- 20 - signal transmission duration;

- 21 - direct signal of the encoder phase-shifted code 3;

- 22 - inverse signal of the encoder phase-shift code 3;

- 23 - direct signal of the receiving device 11;

- 24 - inverse signal of the receiving device 11;

- 25 - output signal of units;

- 26, 28 - output blocking signals;

- 27 - output signal of zeros;

- 29 - reset output signal;

- 30 - output signal of the duration of reception;

- 31 - output signal of units;

- 32 - output signal of zeros;

- T is the duration of the discharge interval;

- A, B - pulses (interference).

The signal of units corresponds to the transmission (reception) of a single discharge of a unipolar code. The signal of zeros corresponds to the transmission (reception) of the zero bit of the unipolar code. The utility model works as follows:

The signals of the generator, passing through the frequency divider, are fed to the clock inputs of each channel.

The generator of the normalized duration of information signals 1 from the input signal of units 16 and the input signal of zeros 17 generates information 18 and synchronizing 19 signals, respectively, from which a phase 21 and inverse 22 phase-manipulated code signals are sent to the transmitting device 4 by the encoder phase-manipulated code 3. Transmitting device 4 through a transformer galvanic isolation transmits a bipolar phase-manipulated Manchester-II code to the communication line. The unit is transmitted as a bipolar encoded signal 1/0 (a positive pulse is followed by a negative pulse). Zero is transmitted as a bipolar encoded signal 0/1 (a negative pulse is followed by a positive pulse). The transition through the zero level is carried out in the middle of the time interval T, during which the information bit is transmitted. At the same time, the information signal 18 is supplied to the shaper of the transmission duration 2, which generates a signal of the transmission duration 20, which is fed to the phase-shifted code encoder 3, which enables its operation. In the absence of an input signal of units 16 or an input signal of zeros 17, during a time interval of more than T, formation of a signal of transmission duration 20 ends and transmission stops.

When transmitting from the transmitting device 4, the signals are transmitted respectively to the direct and inverse inputs of the receiving device 11, where the direct 23 and inverse 24 signals of the receiving device 11 are formed.

A direct signal 23 is fed to the first input of the driver of the duration of reception 10 and to the first input of the driver of the signal of units 7. Inverse signal 24 is fed to the second input of the driver of duration of reception 10 and to the first input of the driver of signal zeros 8.

The shaper of the duration of reception 10 generates a signal of the duration of the reception of 30, which is fed to the resolving inputs of the signal shaper of units 7 and the shaper of the signal of zeros 8. The shaper of the signal of units 7 generates an output signal of units 25, which triggers the first shaper of blocking 5 and passes through the buffer element 12 to the output units 31. The zero signal generator 8 generates an output signal of zeros 27, which starts the second blocking driver 6 and through the buffer element 13 enters the output signal of zeros 32. The first blocker 5 generates an output blocking signal 26, which is fed to the zeroing input of the signal generator of zeros 8. The second blocker 6 generates an output signal of blocking 28, which is fed to the zeroing input of the signal generator of units 7.

Thus, the action of the direct signal 23 blocks the action of the inverse signal 24 and, conversely, the action of the inverse signal 24 blocks the action of the direct signal 23.

The duration of the blocking signal must be less than the time interval T and more than T / 2.

The output signal of units 25 and the output signal of zeros 27 are supplied to the shaper of the reset signal 9. In the absence of a signal of units 25 or the signal of zeros 27 more than time T, the output signal of the reset 29 is generated, which resets the shaper of the duration of reception 10. This ends the reception of information.

The resistor 34 and the capacitor 35 are used to protect against overload the output stages of the transmitting device 4. At the same time, an output protection signal 33 is generated during transmission, which is used for functional monitoring. Resistors 14, 15 are used to protect the communication line from malfunctions in this device, for example, from a short circuit in the transformer windings and to protect the device from malfunctions in the communication line.

When receiving information from the communication line, the decoding device works similarly, with no signals of the input signal of units 16, the input signal of zeros 17, the information signal of the driver of the normalized duration of the information signals 18, the synchronizing signal of the driver of the normalized duration of the information signals 19, the signal of the transmission duration 20, direct 21 a phase shifter encoder signal and an inverse 22 phase shifter encoder signal.

In FIG. 3 on the plot of the signal 23 shows that the action of pulses A and B, which are interference and can lead to distortion of information, are blocked. Impulse A is blocked, because it is formed during encoding not in the middle of the time interval T, during which the information bit is transmitted. Impulse B is blocked, because formed at the end of the transmission due to the magnetization of transformer galvanic isolation, not perfect matching, reflections and interference in the communication line. Therefore, blocking such pulses (interference) significantly increases the noise immunity of the device.

In FIG. In the diagrams of signals 31 and 32 it is shown that signals 31 and 32 with some delay completely repeat the input transmitted signals 16 and 17, respectively. Therefore, control of the correct transmission of signals also increases the noise immunity of the device.

Thus, the use of the proposed technical solution in devices for receiving and transmitting information over wired communication lines, the bipolar phase-manipulated Manchester-II code is used as the transmission code, due to the blocking of interference and control of the correct transmission of signals, the noise immunity of the device increases.

Claims (1)

A transceiver device of Manchester coding, comprising a coding device, a decoding device, and transformer galvanic isolation, characterized in that it comprises a board including a synchronizer and N channels; the synchronizer comprises a generator and a frequency divider, while a counting input of the frequency divider is connected to the output of the generator, the outputs of which are connected to the synchronizing inputs of each channel; each channel contains an encoding device, a decoding device, a transmitting device, a receiving device, transformer galvanic isolation, a resistor and a capacitor; the encoding device comprises a shaper of normalized duration of information signals, a shaper of transmission duration and a phase-shifted (Manchester) code encoder; the decoding device comprises first and second blocking drivers, a unit signal conditioner, a zero signal conditioner, a reset signal conditioner, a reception duration former and buffer elements; the input signals of ones and zeros are connected respectively to the first and second inputs of the generator of the normalized duration of information signals, the information output of which is connected to the input of the generator of the transmission duration and to the first input of the phase-shifted (Manchester) code encoder, and the synchronizing output is connected to the second input of the phase-shifted (Manchester) encoder code, the output of the driver of the transmission duration is connected to the third input of the phase-shifted encoder (Manchester) an ode whose direct and inverse outputs are respectively connected to the direct and inverse inputs of the transmitting device, the direct output of which is connected to the direct input of the receiving device and to the first output of the primary winding of the transformer galvanic isolation, and the inverse output is connected to the inverse input of the receiving device and to the second output of the primary windings of transformer galvanic isolation, the third terminal of the primary winding of transformer galvanic isolation, through a parallel connected resistor and cond nsator, connected to the common power circuit, the fourth and fifth conclusions of the secondary winding of the transformer galvanic isolation through protective resistors are connected to the communication line, the direct output of the receiving device is connected to the first input of the shaper of the reception duration and to the first input of the shaper of units, and the inverse output is connected to the second the input of the driver of the duration of the reception and to the first input of the driver of the signal of zeros, the output of the driver of the duration of the reception is connected to the enable inputs of the driver of the signal units and the zero signal conditioner, the output of the unit signal conditioner is connected to the first blocking driver, with the first input of the reset signal generator and through the buffer element with the first channel output, the output of the zero signal conditioner is connected to the second blocking driver, with the second input of the reset signal and through the buffer an element with a second channel output, the output of the reset signal conditioner is connected to the zeroing input of the reception duration former, the output of the first blocker is connected ene zeroed to an input of the zero signal and the output of the second generator is connected to blocking input of the units nulled signals.

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