Digital quantity bidirectional input detection device based on LVDS communication

Abstract

The utility model relates to digital signal detection technical field, concretely is a kind of digital quantity bidirectional input detection device based on LVDS communication, including digital quantity input module, digital quantity bidirectional input detection module, processor unit, communication unit, LVDS communication interface and power unit;The signal output end of digital quantity input module is electrically connected with the signal input end of digital quantity bidirectional input detection module;The signal output end of digital quantity bidirectional input detection module is electrically connected with the signal input end of processor unit;Processor unit is electrically connected with digital quantity bidirectional input detection module bidirectionally through data bus, and processor unit is electrically connected with the communication end of communication unit bidirectionally through SPI communication interface;The communication end of communication unit is also electrically connected with one end of LVDS communication interface, and the other end of LVDS communication interface is used for connecting external equipment;Power unit provides stable voltage for each module.The device can capture bidirectional signal edge, filter high-frequency interference, and realize long-distance high-speed communication through LVDS.

Description

Technical Field

[0001] This utility model relates to the field of digital signal detection technology, and in particular to a digital bidirectional input detection device based on LVDS communication. Background Technology

[0002] In the field of digital signal detection, especially in high-precision applications such as industrial automation, automotive electronics, and medical equipment, existing digital input detection devices have many technical shortcomings that make it difficult to meet practical application requirements. Specific problems are as follows: 1. Limitations of unidirectional signal detection: Existing detection modules can usually only detect signal changes in one direction and cannot achieve accurate identification of bidirectional signals. As a result, in application scenarios that require bidirectional signal detection, additional hardware modules need to be configured, which not only increases the overall complexity of the system, but also increases the cost of the equipment.

[0003] 2. Weak anti-interference capability: The industrial environment is complex and there is a lot of electromagnetic interference. Existing detection modules lack effective anti-interference design and are easily affected by electromagnetic interference, which can lead to signal misjudgment and seriously affect the accuracy of detection results.

[0004] 3. Inaccurate signal processing: The existing module processes the input signal in a relatively simple way and has not been designed to adapt to the differences in signal threshold voltage in different industrial sites. It cannot adapt to the signal detection needs in different environments, resulting in unstable performance of the device in different scenarios.

[0005] 4. Low detection accuracy: Existing modules have limited signal detection accuracy, especially in situations where precise determination of the direction of signal change is required. They cannot meet the requirements of high-precision control, which restricts the application of the equipment in high-end detection scenarios.

[0006] 5. Poor signal transmission performance: During long-distance signal transmission, the existing modules have poor signal integrity and weak anti-interference ability, which cannot meet the requirements of high-speed data acquisition, resulting in data transmission delay and distortion during remote monitoring or control.

[0007] 6. High power consumption: The power consumption of the existing detection device is about 1.5W. It generates a lot of heat during operation, which is not conducive to the long-term stable operation of the device, increases the heat dissipation cost of the equipment, and shortens the service life of the core components.

[0008] Therefore, in view of the shortcomings of the existing technology, there is an urgent need for a digital input detection device with bidirectional detection capability, strong anti-interference, excellent transmission performance and low power consumption to solve the existing technical problems. Utility Model Content

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a digital bidirectional input detection device based on LVDS communication. This device addresses the technical problems of existing digital input detection devices, such as limitations in unidirectional detection, weak anti-interference capability, inaccurate signal processing, low detection accuracy, poor long-distance transmission integrity, and high power consumption (approximately 1.5W), in order to meet the requirements of high-precision detection scenarios.

[0010] The above objectives are achieved through the following technical solutions: A digital bidirectional input detection device based on LVDS communication includes a digital input module, a digital bidirectional input detection module, a processor unit, a communication unit, an LVDS communication interface, and a power supply unit. The signal output terminal of the digital input module is electrically connected to the signal input terminal of the digital bidirectional input detection module, for transmitting external digital signals to the digital bidirectional input detection module. The signal output terminal of the digital bidirectional input detection module is electrically connected to the signal input terminal of the processor unit, for transmitting processed signals to the processor unit. The processor unit is bidirectionally electrically connected to the digital bidirectional input detection module via a data bus, and is also bidirectionally electrically connected to the communication terminal of the communication unit via an SPI communication interface. The communication terminal of the communication unit is also electrically connected to one end of the LVDS communication interface, the other end of which is used to connect to external devices. The voltage output terminal of the power supply unit is electrically connected to the power input terminals of the digital bidirectional input detection module, the processor unit, and the communication unit, respectively, for providing stable voltage to each module.

[0011] Furthermore, the bidirectional digital input detection module integrates a digital edge filtering unit, including a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, and a high-speed comparator chip U4; one end of the first resistor R1 is connected to the signal output terminal of the digital input module, and the other end is connected to the signal input terminal of the high-speed comparator chip U4; the second resistor R2 and the third resistor R3 are respectively connected to the power supply terminal and the ground terminal of the high-speed comparator chip U4; the first capacitor C1 and the second capacitor C2 are connected in parallel between the power supply terminal and the ground terminal of the high-speed comparator chip U4; the signal output terminal of the high-speed comparator chip U4 is connected to the signal input terminal of the processor unit.

[0012] Furthermore, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 of the digital edge filtering unit are connected in series between the signal output terminal and the ground terminal of the high-speed comparator chip U4; one end of the fourth resistor R4 is connected to the output terminal of the high-speed comparator chip U4, and the other end is connected to one end of the fifth resistor R5; the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 is grounded; and the connection node between the fifth resistor R5 and the sixth resistor R6 is connected to the signal input terminal of the processor unit through a wire.

[0013] Furthermore, the processor unit adopts a control chip with a data bus interface and an SPI communication interface. The pins of the data bus interface are electrically connected to the signal output pins of the digital bidirectional input detection module. The pins of the SPI communication interface include SPI_NSS, SPI_CLK, SPI_MOSI, and SPI_MISO, and are electrically connected to the SPI communication pins of the communication unit respectively.

[0014] Furthermore, the communication unit is provided with an SPI communication terminal and an LVDS signal terminal; the pins of the SPI communication terminal form a closed-loop electrical connection with the SPI communication interface pins of the processor unit; the pins of the LVDS signal terminal are electrically connected to the corresponding signal pins of the LVDS communication interface, and the LVDS signal terminal includes at least two sets of RX pins and TX pins.

[0015] Furthermore, the power supply unit adopts the AMS1117 series voltage regulator chip, which has a Vin pin, a Vout pin and a GND pin; the Vin pin is connected to the external power supply terminal; the Vout pin is electrically connected to the power input terminal pins of the digital bidirectional input detection module, the processor unit and the communication unit respectively; the GND pin is grounded.

[0016] Furthermore, the power supply unit also includes a filter capacitor bank, which comprises electrolytic capacitors C16, C17, and C18 and ceramic capacitors C19, C20, C21, C22, and C23; one end of each electrolytic capacitor is connected to the Vin pin of the AMS1117 series voltage regulator chip, and the other end is grounded; one end of each ceramic capacitor is connected to the Vout pin of the AMS1117 series voltage regulator chip, and the other end is grounded; and at least two of the ceramic capacitors are connected in parallel between the Vout pin and the ground terminal.

[0017] Furthermore, it also includes an external input isolation protection circuit, which is disposed between the digital input module and the external digital signal source. Its input terminal is connected to the external digital signal source, and its output terminal is connected to the signal input terminal of the digital input module.

[0018] Furthermore, the external input isolation protection circuit adopts an optocoupler. The input pin of the optocoupler is connected to an external digital signal source through a wire, and the output pin is connected to the signal input of the digital input module through a wire.

[0019] Furthermore, the LVDS communication interface adopts a differential signal terminal, and the signal pins of the differential signal terminal are electrically connected to the LVDS signal terminal pins of the communication unit one-to-one. The terminal is also provided with a grounding pin for electrical connection to the grounding terminal of an external device.

[0020] This invention provides a digital bidirectional input detection device based on LVDS communication. It captures bidirectional edge changes of digital signals and filters out high-frequency interference through a digital edge filtering unit, preventing false signal triggering. High-speed data interaction is achieved via the LVDS protocol, meeting industrial-grade communication requirements. An external input isolation protection circuit enhances safety. The actual power consumption is approximately 0.5W, lower than traditional devices, facilitating long-term operation and adapting to high-precision detection needs in various scenarios. Specific beneficial effects are as follows: 1. Strong bidirectional detection and anti-interference capability: Through the digital edge filtering unit in the bidirectional digital input detection module, the bidirectional edge changes of the digital signal can be accurately captured, realizing a complete response to the dynamic characteristics of the signal. At the same time, it effectively filters out high-frequency interference in the signal, improves signal stability, avoids false triggering or data distortion, and solves the problems of single-directional detection and weak anti-interference in existing devices.

[0021] 2. Superior transmission performance: The communication unit communicates with external devices using the LVDS protocol. The LVDS protocol features low power consumption, anti-interference, and long-distance transmission, enabling high-speed data interaction, supporting control command issuance and execution status feedback, meeting the high reliability communication requirements of industrial-grade devices, and solving the problems of short transmission distance and insufficient high-speed data acquisition capabilities in existing devices.

[0022] 3. High safety: It is equipped with an external input isolation protection circuit, which uses an optocoupler to isolate external signals from internal modules, preventing abnormal external signals from damaging the device and improving the safety of device operation.

[0023] 4. Low power consumption and long lifespan: Actual testing shows that the power consumption of this device is approximately 0.5W, which is significantly lower than that of existing devices (approximately 1.5W). This results in less heat generation, which is beneficial for the device to operate stably for a long time, while also reducing heat dissipation costs and extending the lifespan of core components.

[0024] 5. High detection accuracy and strong adaptability: Through the processor unit's precise analysis of signals, logical judgment and control algorithm calculation, combined with the precise processing of the digital bidirectional input detection module, it can meet the requirements of high-precision control and adapt to the signal detection needs of different industrial sites, solving the problems of low detection accuracy and unstable performance of existing devices. Attached Figure Description

[0025] Figure 1 This is a functional unit structure diagram of the digital bidirectional input detection device based on LVDS communication described in this utility model; Figure 2 This is a schematic diagram of the bidirectional digital input detection circuit in the LVDS-based bidirectional digital input detection device of this utility model; Figure 3 This is a schematic diagram of the communication unit circuit in the digital bidirectional input detection device based on LVDS communication described in this utility model; Figure 4 This is a schematic diagram of the power supply circuit in the digital bidirectional input detection device based on LVDS communication described in this utility model; Figure 5 This is the overall circuit diagram of the digital bidirectional input detection device based on LVDS communication described in this utility model. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] like Figure 1 As shown, this solution provides a digital bidirectional input detection device based on LVDS communication, the structure of which includes a digital input module, a digital bidirectional input detection module, a processor unit, a communication unit, an LVDS communication interface, and a power supply unit.

[0028] like Figure 2 and Figure 5 As shown, the digital input module of this device is the signal input port of the device, equipped with a bidirectional signal input terminal for receiving external digital signals, supporting bidirectional digital input, and providing the system with a raw digital signal source. Its signal output terminal is electrically connected to the signal input terminal of the bidirectional digital input detection module via a wire, and the external digital signal is transmitted to the bidirectional digital input detection module for subsequent processing through this module.

[0029] like Figure 2As shown, the bidirectional digital input detection module of this device integrates a digital edge filtering unit. This unit includes resistors R1-R6, capacitors C1-C2, and a high-speed comparator chip, and is the core module for signal processing and anti-interference. Its signal input terminal is electrically connected to the signal output terminal of the digital input module, and its signal output terminal is electrically connected to the signal input terminal of the processor unit. Simultaneously, the processor unit is bidirectionally electrically connected to this module via a data bus, facilitating the processor unit's reading of the processed signal.

[0030] In this unit, resistor R1 of the digital edge filtering unit is connected at one end to the signal output terminal of the digital input module and at the other end to the signal input terminal of the high-speed comparator chip, used to transmit the original signal; resistors R2-R3 are connected to the power supply terminal and ground terminal of the high-speed comparator chip respectively, providing a stable power supply and grounding loop for the chip; capacitors C1-C2 are connected in parallel between the power supply terminal and ground terminal of the high-speed comparator chip, playing a filtering and voltage stabilizing role, reducing the impact of power fluctuations on the chip; resistors R4-R6 are connected in series between the signal output terminal and ground terminal of the high-speed comparator chip, with one end of resistor R4 connected to the output terminal of the high-speed comparator chip and the other end connected to one end of resistor R5, the other end of resistor R5 connected to one end of resistor R6, and the other end of resistor R6 grounded. The connection point between resistors R5 and R6 is connected to the signal input terminal of the processor unit through a wire, realizing signal voltage division and stable output.

[0031] This module captures bidirectional edge changes of digital signals through a digital edge filtering unit, enabling a complete response to the dynamic characteristics of the signal. At the same time, it filters out high-frequency interference (such as glitches and noise) in the signal, improves signal stability, and avoids false triggering or data distortion when the subsequent processor unit receives the signal.

[0032] like Figure 1 and Figure 5 As shown, the processor unit of this device uses a control chip with a data bus interface and an SPI communication interface, and is the core of the device's signal parsing and instruction generation. Its signal input terminal is electrically connected to the signal output terminal of the digital bidirectional input detection module, and is bidirectionally electrically connected to the digital bidirectional input detection module through the data bus, allowing the processing signal output by the module to be read. At the same time, the processor unit is bidirectionally electrically connected to the communication terminal of the communication unit through the SPI communication interface (including SPI_NSS, SPI_CLK, SPI_MOSI, and SPI_MISO pins), realizing the interaction of instruction issuance and status feedback.

[0033] After reading the signal output by the digital bidirectional input detection module through the data bus, the processor unit analyzes the signal, performs logical judgment and control algorithm calculation, generates control instructions, and sends the instructions to the communication unit through the SPI communication interface. At the same time, it receives the execution status information fed back by the communication unit, providing support for precise control.

[0034] like Figure 3 and Figure 5 As shown, the communication unit of this device has an SPI communication terminal and an LVDS signal terminal, which serves as the hub connecting the processor unit and external devices, undertaking the functions of instruction execution and data interaction. The pins of its SPI communication terminal form a closed-loop electrical connection with the SPI communication interface pins of the processor unit, enabling it to receive SPI instructions issued by the processor unit and provide feedback on the execution status to the processor unit. The pins of its LVDS signal terminal are electrically connected to the corresponding signal pins of the LVDS communication interface, including at least two sets of RX (receive) pins and TX (transmit) pins, realizing bidirectional data transmission with external devices.

[0035] After receiving instructions from the processor unit, the communication unit can drive the external actuator to run. At the same time, it can feed back the status information of the actuator to the processor unit through the SPI communication terminal. It can also cooperate with the LVDS communication interface through the LVDS signal terminal to transmit the status information to external devices or receive control parameter configuration instructions issued by external devices.

[0036] like Figure 1 and Figure 5 As shown, the LVDS communication interface of this device uses differential signal terminals and implements data transmission based on the LVDS protocol (Low Voltage Differential Signaling Protocol). It serves as a bridge for communication between the device and external devices (such as host computers and monitoring systems). One end is electrically connected to the LVDS signal terminal of the communication unit, and the other end is used to connect to external devices. The terminal is equipped with a grounding pin, which can be electrically connected to the grounding terminal of the external device to improve communication stability.

[0037] The LVDS protocol features low power consumption, anti-interference, and long-distance transmission. Through this interface, the communication unit can achieve high-speed data interaction with external devices, support the issuance of control commands (from external devices to the device) and the feedback of execution status (from the device to external devices), meet the high reliability communication requirements of industrial-grade devices, and solve the problems of short transmission distance and weak anti-interference in existing devices.

[0038] like Figure 4 and Figure 5 As shown, the power supply unit of this device uses the AMS1117 series voltage regulator chip, which is the core power supply to ensure the stable operation of each module. This chip has a Vin (power input) pin, a Vout (voltage output) pin, and a GND (ground) pin. The Vin pin is connected to an external power supply terminal to obtain external power; the Vout pin is electrically connected to the power input pins of the digital bidirectional input detection module, the processor unit, and the communication unit via wires to output a stable voltage; the GND pin is grounded, forming a complete power supply loop.

[0039] The power supply unit also includes a filter capacitor bank, which comprises electrolytic and ceramic capacitors. One end of the electrolytic capacitor is connected to the Vin pin of the AMS1117 series voltage regulator chip, and the other end is grounded, used to filter out low-frequency interference from the external power supply. One end of the ceramic capacitor is connected to the Vout pin of the AMS1117 series voltage regulator chip, and the other end is grounded. At least two ceramic capacitors are connected in parallel between the Vout pin and the ground terminal to filter out high-frequency ripple in the output voltage. Designed to output a stable 3.3V voltage, this power supply unit provides stable power to the system's core modules, preventing system failures due to voltage fluctuations.

[0040] This device also includes an external input isolation protection circuit, located between the digital input module and the external digital signal source. Its input terminal is connected to the external digital signal source, and its output terminal is connected to the signal input terminal of the digital input module. This circuit uses an optocoupler; the input pin of the optocoupler is connected to the external digital signal source via a wire, and the output pin is connected to the signal input terminal of the digital input module via a wire. Through opto-isolation, it prevents external signal anomalies (such as overvoltage or overcurrent) from damaging the internal modules of the device, thus improving device safety.

[0041] The working process of this device is as follows: Signal Input and Preprocessing: External digital signals (bidirectional) are input through the bidirectional signal terminals of the digital input module. After being isolated by the optocoupler of the external input isolation protection circuit, they are transmitted to the bidirectional digital input detection module. The digital edge filtering unit of this module captures the bidirectional edge changes of the signal through a high-speed comparator chip. Resistors R4-R6 stabilize the signal by voltage division, capacitors C1-C2 filter out power supply interference, and resistors R1-R3 ensure the stability of the signal and power supply, ultimately obtaining a stable signal after anti-interference.

[0042] Signal reading and instruction generation: The processor unit reads the stable signal output by the digital bidirectional input detection module through the data bus, analyzes the signal (determines the signal level and direction of change), performs logical judgment (whether it meets the preset threshold) and control algorithm calculations to generate control instructions to drive the actuator.

[0043] Instruction transmission and execution feedback: The processor unit sends control instructions to the communication unit through the SPI communication interface. After receiving the instructions, the communication unit drives the external actuator to move. At the same time, the communication unit collects the status information of the actuator in real time and feeds it back to the processor unit through the SPI communication interface.

[0044] External communication and monitoring: The communication unit, in conjunction with the LVDS communication interface, transmits execution status information to external devices (such as host computers and monitoring systems) through the LVDS signal terminal; the external devices can send parameter configuration commands to the communication unit through the LVDS communication interface, and the commands are transmitted to the processor unit through the communication unit to realize remote monitoring and parameter adjustment of the device.

[0045] Stable power supply guarantee: The AMS1117 chip in the power supply unit regulates the external 12V power supply to 3.3V, and supplies power to the digital bidirectional input detection module, processor unit and communication unit through the Vout pin; the electrolytic capacitors of the filter capacitor group filter out low-frequency interference from the external power supply, and the ceramic capacitors filter out high-frequency ripple of the output voltage, ensuring the voltage of each module is stable, and the overall power consumption of the device is maintained at about 0.5W with no obvious heat generation.

[0046] The device in this embodiment, through the above-described structure and working process, achieves accurate detection of bidirectional digital signals, high-speed anti-interference transmission, and low-power operation. It can be widely used in signal detection in industrial automated production lines, sensor signal acquisition in automotive electronics, and precise control of medical equipment, thus solving many shortcomings of existing technologies.

[0047] The above description is only for illustrating the embodiments of this utility model and is not intended to limit this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A digital bidirectional input detection device based on LVDS communication, characterized in that, The system includes a digital input module, a bidirectional digital input detection module, a processor unit, a communication unit, an LVDS communication interface, and a power supply unit. The signal output terminal of the digital input module is electrically connected to the signal input terminal of the bidirectional digital input detection module. The signal output terminal of the bidirectional digital input detection module is electrically connected to the signal input terminal of the processor unit. The processor unit is bidirectionally electrically connected to the bidirectional digital input detection module via a data bus, and is also bidirectionally electrically connected to the communication terminal of the communication unit via an SPI communication interface. The communication terminal of the communication unit is also electrically connected to one end of the LVDS communication interface, the other end of which is used to connect to external devices. The voltage output terminal of the power supply unit is electrically connected to the power input terminals of the bidirectional digital input detection module, the processor unit, and the communication unit, respectively, to provide a stable voltage for each module.

2. The digital bidirectional input detection device based on LVDS communication according to claim 1, characterized in that, The bidirectional digital input detection module integrates a digital edge filtering unit, including a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a first capacitor (C1), a second capacitor (C2), and a high-speed comparator chip (U4). One end of the first resistor (R1) is connected to the signal output terminal of the digital input module, and the other end is connected to the signal input terminal of the high-speed comparator chip (U4). The second resistor (R2) and the third resistor (R3) are respectively connected to the power supply terminal and the ground terminal of the high-speed comparator chip (U4). The first capacitor (C1) and the second capacitor (C2) are connected in parallel between the power supply terminal and the ground terminal of the high-speed comparator chip (U4). The signal output terminal of the high-speed comparator chip (U4) is connected to the signal input terminal of the processor unit.

3. The digital bidirectional input detection device based on LVDS communication according to claim 2, characterized in that, The fourth resistor (R4), the fifth resistor (R5), and the sixth resistor (R6) of the digital edge filtering unit are connected in series between the signal output terminal and the ground terminal of the high-speed comparator chip (U4); one end of the fourth resistor (R4) is connected to the output terminal of the high-speed comparator chip (U4), and the other end is connected to one end of the fifth resistor (R5); the other end of the fifth resistor (R5) is connected to one end of the sixth resistor (R6); the other end of the sixth resistor (R6) is grounded; and the connection node of the fifth resistor (R5) and the sixth resistor (R6) is connected to the signal input terminal of the processor unit through a wire.

4. The digital bidirectional input detection device based on LVDS communication according to claim 1, characterized in that, The processor unit uses a control chip with a data bus interface and an SPI communication interface. The pins of the data bus interface are electrically connected to the signal output pins of the digital bidirectional input detection module. The pins of the SPI communication interface include SPI_NSS, SPI_CLK, SPI_MOSI, and SPI_MISO, and are electrically connected to the SPI communication pins of the communication unit respectively.

5. The digital bidirectional input detection device based on LVDS communication according to claim 1, characterized in that, The communication unit is provided with an SPI communication terminal and an LVDS signal terminal; the pins of the SPI communication terminal form a closed-loop electrical connection with the SPI communication interface pins of the processor unit; the pins of the LVDS signal terminal are electrically connected to the corresponding signal pins of the LVDS communication interface, and the LVDS signal terminal includes at least two sets of RX pins and TX pins.

6. The digital bidirectional input detection device based on LVDS communication according to claim 1, characterized in that, The power supply unit uses an AMS1117 series voltage regulator chip, which has a Vin pin, a Vout pin, and a GND pin. The Vin pin is connected to an external power supply terminal. The Vout pin is electrically connected to the power input pins of the digital bidirectional input detection module, the processor unit, and the communication unit, respectively. The GND pin is grounded.

7. The digital bidirectional input detection device based on LVDS communication according to claim 6, characterized in that, The power supply unit also includes a filter capacitor bank, which comprises an electrolytic capacitor and a ceramic capacitor. One end of the electrolytic capacitor is connected to the Vin pin of the AMS1117 series voltage regulator chip, and the other end is grounded. One end of the ceramic capacitor is connected to the Vout pin of the AMS1117 series voltage regulator chip, and the other end is grounded.

8. The digital bidirectional input detection device based on LVDS communication according to claim 1, characterized in that, It also includes an external input isolation protection circuit, which is located between the digital input module and the external digital signal source. Its input terminal is connected to the external digital signal source, and its output terminal is connected to the signal input terminal of the digital input module.

9. A digital bidirectional input detection device based on LVDS communication according to claim 8, characterized in that, The external input isolation protection circuit uses an optocoupler. The input pin of the optocoupler is connected to an external digital signal source via a wire, and the output pin is connected to the signal input of the digital input module via a wire.

10. A digital bidirectional input detection device based on LVDS communication according to claim 1, characterized in that, The LVDS communication interface uses differential signal terminals. The signal pins of the differential signal terminals are electrically connected to the LVDS signal terminal pins of the communication unit one-to-one. The terminals are also equipped with grounding pins for electrical connection to the grounding terminal of external devices.

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