553 results about "Communications protocol" patented technology

The invention discloses a comprehensive algorithm for distribution and scheduling of AGV (Automatic Guided Vehicle) carrying tasks. S1: an SCADA system; equipment communication, data acquisition and storage, protocol analysis and logic processing; s11, the communication protocol, the address and the communication rhythm of the equipment are configured through the system, data acquisition data are stored in ES (ElasticSearch), the data acquisition data are stored for one year and backed up regularly, and the system achieves service logic processing through an LUA script. The carrying efficiency of the AGV is integrally improved, and the execution time of carrying a single task by the AGV is shortened by 10%; the production capacity of a workshop is improved, and the carrying rate exceeds 96% under the condition of no interference; the workshop logistics cost is reduced, and the overall number of AGVs is reduced by 10%; and the first pass yield of material carrying is improved by 15%. The deep fusion data analysis capability enables the whole system to predict demands more accurately, avoid conflicts, optimize the overall production efficiency, optimize the production process, reduce waiting and resource waste, and improve the flexibility of path planning and the reliability of task completion.

The invention relates to the technical field of data processing, and discloses a real-time data stream processing method and device, electronic equipment and a storage medium. The method comprises the following steps: distributing a received to-be-processed data stream to a first distributed node through a preset load balancer; fragmenting the received distribution data stream at the first distributed node according to a preset fragmentation rule, then writing the fragmented data stream into a message queue, and performing parallel processing on fragmented data in the message queue through multiple threads; storing the intermediate state data in the fragmented data processing process, generating snapshot data according to the fragmented data, and synchronizing the snapshot data to the distributed storage system; acquiring load data of the first distributed node, and dynamically updating a data flow distribution strategy of the load balancer according to the load data through the resource use prediction model; and writing a processing result of the to-be-processed data stream into persistent storage through an asynchronous batch mechanism, and returning the processing result through a preset real-time communication protocol. The method improves the data stream processing efficiency and stability.

The invention discloses a ship mobile energy storage system CAN communication protocol automatic test system and method, and the system comprises a protocol modeling and test configuration module, a simulation node behavior simulation module, a CAN bus interaction and power closed loop module, and a test analysis and result evaluation module. A CAN communication protocol specification of the ship mobile energy storage system and parameters of tested equipment can be obtained, a protocol analysis model and a test configuration file are constructed for format verification and logic consistency verification, meanwhile, a corresponding test case sequence is automatically generated, and the message sending time is controlled to generate a time sequence simulation message flow; and sending the time sequence simulation message flow to the tested equipment, simulating energy interaction behavior acquisition to generate a power feedback data set, testing to obtain a signal consistency deviation and a power execution error to construct a protocol conformity evaluation matrix, and generating a visual test report. According to the invention, the high coverage rate and automatic closed-loop test of the CAN communication protocol can be realized.

The invention provides a vehicle-mounted multi-communication protocol test mainboard, and the mainboard comprises a CANFD communication module which is used for transmitting a test frame to a to-be-tested device under the condition that a CANFD test instruction is received; receiving a response frame corresponding to the test frame sent by the to-be-tested device; the vehicle-mounted Ethernet communication module is used for converting the standard Ethernet test signal into a vehicle-mounted Ethernet test signal and sending the vehicle-mounted Ethernet test signal to the equipment to be tested; receiving a vehicle-mounted Ethernet response signal which is sent by the equipment to be tested and corresponds to the vehicle-mounted Ethernet test signal, and converting the vehicle-mounted Ethernet response signal into a standard Ethernet response signal; the processor module is used for generating a CANFD test instruction and a standard Ethernet test signal; and generating an equipment test report of the to-be-tested equipment according to the response frame and the standard Ethernet response signal. According to the invention, the CANFD communication module and the vehicle-mounted Ethernet communication module are integrated, and the processor module is matched to carry out coordination control, so that automatic joint testing of different communication protocols is realized.

The invention discloses an industrial channel test method and system based on a serial port communication protocol, relates to the field of industrial control, and aims to solve the problems that an existing channel test system is single in connection mode, complex in deployment and low in efficiency due to dependence on manpower. According to the invention, the deployment process is simplified by supporting dual-protocol adaptive switching between an RTU mode (direct connection through a 485-to-USB converter) and a TCP / IP mode (wired / wireless network access); driving test logic by using a spreadsheet, pre-defining a Modbus address, a measuring range and a precision threshold value, automatically generating an instruction and acquiring data; and the integrated voice broadcast module feeds back a test result in real time, and prompts an abnormal channel and a processing suggestion when the precision exceeds the limit, so that single-person closed-loop operation is realized. The test result is automatically recorded to the spreadsheet, a structured report is generated, historical tracing and cross-platform data integration are supported, the test efficiency and reliability are remarkably improved, and the method is suitable for high-frequency channel verification of the industrial control system.

The embodiment of the invention discloses a data collection method and system, a data collector and a distributed system, relates to the technical field of data collection, and can improve the data collection efficiency. The data acquisition method comprises the following steps: acquiring equipment information of to-be-acquired equipment; wherein the equipment information comprises a communication protocol used by the to-be-acquired equipment; based on the communication protocol used by the to-be-collected device, selecting an interface protocol matched with the communication protocol used by the to-be-collected device from a preset protocol library; and according to the interface protocol, carrying out communication connection with the to-be-acquired device so as to carry out data acquisition on the to-be-acquired device. The method and the device are suitable for checking equipment data acquisition scenes.

The invention relates to the technical field of industrial communication test, and discloses a master-slave station simulation test system and method based on an MODBUS communication protocol, and the system comprises a software authorization module which is used for verifying a registration file and starting test software; the engineering project management module is used for establishing a corresponding project in test software according to engineering requirements of a user and selecting a communication type; the user management module is used for establishing, modifying and deleting a user account; the environment configuration module is used for configuring communication environment parameters according to the communication protocol type; the communication management module is used for receiving, reading, caching and writing data; the variable management module is used for configuring variable parameters and performing master-slave station simulation test according to the communication point position table; the test trend management module is used for rendering and drawing a variable change trend chart by utilizing matplotlib, the master station and the slave station are simulated for testing, MODBUS TCP and MODBUS RTU communication protocols are supported, and the test efficiency is improved.

The invention discloses a vehicle remote diagnosis control method and device based on a vehicle fault code, and the method comprises the steps: collecting the parameter information of a specified part of a vehicle and the operation parameters of the whole vehicle through a CAN network by a VCU, and generating important parameter information; the VCU sets a trigger condition according to the control logic, and generates a uniquely recognizable vehicle fault code in combination with the monitoring platform; the important parameter information and the vehicle fault code are sent to a vehicle-mounted terminal T-BOX through a CAN bus; the T-BOX performs analysis and recombination according to a CAN communication protocol with the VCU to generate a message; the T-BOX uploads the message to a monitoring platform; the monitoring platform analyzes the message to obtain important parameter information and a vehicle fault code, and performs matching analysis with a whole vehicle fault detail list according to the important parameter information and the vehicle fault code to generate a vehicle fault record; and informing platform supervisors, vehicle after-sale maintenance personnel and drivers of the fault details and the fault analysis conclusions. According to the method, the problems of decisive support, hysteresis quality, rapid flow increase and the like of data in vehicle fault remote diagnosis can be solved.

The invention relates to an electric forklift area limitation and overspeed alarm system, which relates to the field of electric forklifts, and comprises a control module for realizing vehicle area limitation and ultrasonic alarm and a power supply module for providing power support, and the control module comprises a controller and an overspeed alarm and area limitation terminal; the overspeed alarm and area limitation terminal is provided with a GPS module used for obtaining position information of a vehicle in real time and a CAN communication module used for carrying out data interaction with the controller, the position information of the vehicle is judged according to the electronic fence virtual boundary set by the cloud platform, and data interaction with the controller is carried out through a CAN communication protocol. Through an intelligent monitoring and alarming mechanism, the safety and management efficiency of the electric forklift are improved, and meanwhile, different working conditions and individual requirements of customers are met.

The invention discloses a boiler fault diagnosis method and system based on OPC communication control, and belongs to the field of boiler fault diagnosis, and the diagnosis method comprises the following specific steps: collecting and processing the operation data of a boiler in real time through an OPC communication protocol, and combining an operation log with historical fault information; according to the method, the model deployment complexity is reduced, the boiler state change can be responded in real time, the real-time performance of fault diagnosis is improved, the method can efficiently operate on edge equipment, the dependence on a central server is reduced, and the bandwidth and delay requirements are reduced; according to the method, refined positioning and multi-step decision can be realized, the problem that a traditional fault diagnosis method is easily influenced by single parameter fluctuation is avoided, the robustness of the decision process is improved, high-probability fault paths can be quickly screened, and the time from fault discovery to decision output is shortened.

The invention discloses a coal mine robot cluster-oriented virtual entity synchronous mapping method. The method comprises the following steps of: constructing a virtual entity synchronous mapping system consisting of a coal mine robot cluster physical entity, a coal mine robot cluster virtual entity, coal mine robot cluster twin data, cluster service application and information interaction; a coal mine robot cluster is used as a physical entity object, an OPC UA communication protocol is used for data collection, the collected data is processed, a virtual entity is driven in a script mode based on a Unity 3D physical engine, and therefore a virtual-real mapping channel is established; converting various non-standardized data structures of the robot cluster into standardized data structures; data of the heterogeneous robot are collected and transmitted through standardization of various communication protocols, and the data are used for driving the virtual entity model. The method has the advantage of performing synchronous mapping on the virtual entities so as to facilitate intelligent management and control.

The invention discloses a shutdown discharge method for an all-vanadium redox flow battery system. The all-vanadium redox flow battery system comprises an all-vanadium redox flow battery, a battery management system and an energy storage converter, the all-vanadium redox flow battery comprises a galvanic pile, an electrolyte, an electrolyte circulating pump and positive and negative storage tanks, the battery management system and the energy storage converter are independently and electrically connected with the all-vanadium redox flow battery; the battery management system is in communication connection with the energy storage converter through a communication protocol; after the all-vanadium redox flow battery system is shut down, when the SOC value of the all-vanadium redox flow battery is smaller than SOC3, shutdown discharging is not needed; and when the SOC value of the all-vanadium redox flow battery is greater than or equal to SOC3, the battery management system issues a discharging instruction to control the energy storage converter to discharge at constant power until the voltage of the all-vanadium redox flow battery is reduced to cut-off voltage V, and the battery management system issues a discharging stopping instruction to control the energy storage converter to stop discharging.

The invention provides a test method, device and system of a vehicle-mounted controller and a storage medium. The method comprises the following steps: step S10, analyzing an imported test data configuration table for a to-be-tested vehicle-mounted controller, and extracting test case parameters and a communication protocol type of the test; step S11, based on the analysis result, automatically identifying the accessed to-be-tested vehicle-mounted controller, and establishing a mapping relation between the to-be-tested vehicle-mounted controller and a software channel; step S12, generating a test interface according to the display type field in the configuration table, wherein the test interface comprises a test item name, a traffic light state indication and a text block display area; step S13, creating a test thread, a data analysis thread and a result return thread, and sending a test message according to a preset protocol; and step S14, receiving and analyzing the response message, and generating a test result in combination with a threshold judgment rule in the configuration table. According to the invention, the DV / EOL test efficiency, versatility and reusability of the vehicle-mounted controller can be improved, and the cost can be reduced at the same time.

The invention provides a system and a method for detecting A interface equipment based on an upper computer. The method comprises the following steps: establishing a configuration group file containing a semaphore dictionary table, an A interface protocol script of detected equipment and a network access test list file of the detected equipment; importing a configuration group file, and realizing multi-source file loading through a configuration management interface; based on the imported A interface protocol script and the network access test list file, connection information of the tested equipment is adaptively configured through a communication protocol and interface parameters, and connection between the upper computer and the tested equipment is established; pre-detecting the state of the detected equipment, generating an operation health degree evaluation report, and determining whether the detected equipment can work normally or not; and the upper computer program constructs a test case queue based on the semaphore information in the network access test list, completes batch semaphore verification, and generates a detection report. According to the invention, the problems of complex process, low efficiency, much manual operation and the like during detection of the A interface equipment can be solved.

The invention discloses a 350MW thermal power generating unit cold end system optimization method based on big data, and relates to the field of electric power. The method comprises the following steps: S1, data collection: selecting historical data during the operation period of a unit as modeling data; s2, data preprocessing: preprocessing historical data; s3, constructing a model: constructing a BP neural network model based on the preprocessed data, and optimizing a weight and a threshold value of the BP model through a genetic algorithm and a particle swarm algorithm; s4, calculating the optimal vacuum degree: calculating the optimal vacuum degree under different working conditions according to the optimized BP neural network model; and S5, cold end system control: sending the optimal vacuum degree and a circulating water pump frequency conversion instruction to a DCS (Distributed Control System) through an MODBUS communication protocol to realize optimal control of the cold end system. The method has the beneficial effects that the cold end system of the 350MW thermal power generating unit is optimized by adopting big data analysis and an intelligent algorithm, so that the comprehensive effects of improving the operation efficiency, reducing the energy consumption, saving the cost and reducing the emission are realized.

The invention relates to the technical field of identity authentication, in particular to a user identity authentication method and system for communication software, which comprises the following steps of: acquiring an identity authentication request data packet in a communication protocol, decoding identity authentication field information, extracting a fixed field, a dynamic field and a variable field, and calculating a data bit offset value; and carrying out structure mapping and obtaining an identity verification field mapping result. According to the invention, through deep analysis of the identity verification request data packet, extraction and mapping of the identity verification field structure, improvement of the analysis accuracy and construction of the matching feature matrix, verification of the data format and content is more targeted, the possibility that abnormal data bypasses verification is reduced, the session continuity is evaluated in combination with historical session data, and the verification efficiency is improved. The adaptability of identity authentication to dynamic behaviors is improved, context consistency is calculated, keyword deviation degree judgment is performed, identity authentication strength is adjusted, identity authentication dynamically adapts to user behavior changes, interaction experience is improved, and safety is enhanced.

The invention discloses an agricultural machinery intelligent path planning system and method based on multi-sensor fusion, and relates to the technical field of agricultural machinery automation control. Comprising an AI large model learning module, a visual identification module, a data analysis module and an intelligent control module. The AI large model learning module learns an operation instruction of the agricultural implement controller; the visual identification module collects and extracts agricultural implement controller panel feature information; the data analysis module analyzes, diagnoses and analyzes the feature information; and the intelligent control module transmits the analyzed data to an intelligent driving system of the tractor and executes corresponding control actions. The method solves the problems that the agricultural implements cannot be subjected to associated control under different communication protocols, and the existing scheme is high in cost, complex, low in efficiency and the like, has the advantages of high compatibility, low cost, high efficiency, high adaptability, high safety and the like, and can be widely applied to the field of modern agriculture.

The invention discloses a suspension control system based on a PSI5 communication protocol, and relates to the technical field of automobile suspension control, and the suspension control system comprises a topological adaptation module which collects a vehicle state and a topological structure, constructs a mapping function from the vehicle state to the topological structure, and dynamically generates a topological structure set adaptive to the vehicle state according to the mapping function; the interface reconstruction module is based on an electromagnetic relay as a switching control unit, drives the electromagnetic relay to act after receiving and analyzing the topological structure set, reconstructs the topological structure by switching the series / parallel connection relation of an actuator interface, and outputs a configuration frame instruction; the scene control module is used for identifying the current driving scene of the vehicle, calling the reconstructed topological structure, matching a control algorithm of the corresponding scene and carrying out scene optimization on a PSI5 configuration frame instruction; the driving scene comprises a no-load mode, a heavy-load mode and an off-road mode.

The invention provides an industrial soft gateway system, a data processing method, equipment and a medium. The industrial soft gateway system comprises a driving module and a data processing module, the driving module is used for analyzing the system configuration file to obtain a communication protocol type of each terminal device, generating a driving instance corresponding to each communication protocol type, binding the driving instance corresponding to each communication protocol type with each terminal device, and obtaining original device data of each terminal device through each driving instance; the data processing module is used for preprocessing the original equipment data to obtain target equipment data, and performing state detection on each terminal equipment according to each target equipment data to obtain an equipment state detection result of each terminal equipment; and the data processing module is also used for sending the target equipment data and / or the equipment state detection result of each terminal equipment to the third-party system. By adopting the scheme, the data transmission among the multi-protocol equipment is realized, and the efficiency of data transmission processing and equipment state detection is improved.

The invention belongs to the technical field of electric energy meters, and particularly relates to an intelligent electric meter and an intelligent electric meter multi-protocol processing method. The method comprises the following steps: extracting a data packet received by an electric energy meter according to each communication protocol frame format to obtain a frame message under each communication protocol; each frame of message under each extracted communication protocol is sent to a corresponding data routing module through a corresponding communication protocol transmission link, and the data routing module is used for interacting with a communication module and a service module and comprises a data format conversion unit; the data routing module corresponding to each communication protocol determines the name of a data item according to the mapping relation corresponding to the protocol message, and the data format conversion unit performs format conversion on the data content corresponding to the protocol message data item received by the electric energy meter or the data content corresponding to the data item returned by the service module; data processing of each frame of message under each protocol is completed, and the problem that the issued protocol message is lost under a multi-frame concurrent scene is solved.

The invention relates to the technical field of automatic control of glass manufacturing, discloses an optical cooperative monitoring and processing system and method for glass cold end plate explosion, and aims to solve the problems that an existing plate explosion detection range is narrow, the precision is low, and emergency response depends on manual intervention. The system adopts a dual optical detection framework of'dynamic photoelectric scanning + static CCD image recognition 'and is combined with a servo-driven photoelectric plate explosion detection module and a high-resolution defect detection module to realize accurate detection of full-breadth and full-type plate explosion phenomena (transverse / longitudinal fracture, microcracks and unbroken small cracks); a secondary intelligent response mechanism is constructed through an EtherCAT real-time communication protocol, emergency cutting, discharging or precise cutting (including block cutting and stripping / sleeving cutting) is automatically triggered, and manual intervention is not needed. The detection precision reaches 99% or above, the response delay is smaller than or equal to 50 ms, production interruption and equipment damage can be remarkably reduced, and stable and efficient operation of a glass cold end production line is guaranteed.

The embodiment of the invention provides an analog front-end circuit, and relates to the field of communication. Specifically, the analog front-end circuit comprises a plurality of differential amplification branches which are respectively provided with a switch; the control module is used for controlling on-off of the switch based on a communication protocol; wherein communication protocols of different differential amplification branches are different, the communication protocols are obtained based on a digital processing system, and the plurality of differential amplification branches are connected with the digital processing system. The problem that an analog front-end circuit in the related technology is poor in adaptability to a protocol is solved, and the effect of improving the adaptability of the analog front-end circuit to the protocol is achieved.

The invention belongs to the technical field of charging piles, and discloses a direct current charging pile multi-vehicle communication control method and system, and the method comprises the steps: after the charging pile detects that a charging gun is inserted into a vehicle socket, a gun insertion confirmation switch is closed, and a gun insertion signal is detected; after the charging pile detects a charging signal, a K3 relay and a K4 relay are closed to wake up a vehicle controller, and a first communication protocol is adopted to carry out charging parameter negotiation; if the charging parameter negotiation performed by the first communication protocol fails or is overtime, K3 and K4 relays and a gun insertion confirmation switch are switched off; the gun insertion confirmation switch, the K3 relay and the K4 relay are closed again within preset time, after a charging signal is detected, charging parameter negotiation is repeated by using the second communication protocol to the nth communication protocol in sequence, and the K3 relay, the K4 relay and the gun insertion confirmation switch are switched off every time the charging signal fails or is overtime; and after the nth protocol negotiation fails, the GB / T 27930 protocol is adopted for charging, no matter which non-standard protocol is adopted by the vehicle, charging parameter negotiation can be carried out, and the problem that new energy vehicles of different brands are difficult to charge is solved.

The present disclosure relates to the field of signal acquisition, and in particular, to a system and method for high-density electromyographic signal synchronous acquisition. In the system, a signal acquisition module and a base station are electrically connected via a pogo pin connector and are mechanically connected via an electromagnetic lock. The pogo pin connector comprises various communication protocols and functional ports and supports various synchronous operations. Module charging, data export, state reading, parameter configuration, firmware upgrading, time synchronization, and other functions can be completed by simply inserting the module into the base station, featuring ease to use and compactness. The electromagnetic lock locks the module inserted into the base station to ensure reliable communication between the module and the base station and the safety and integrity of data files. The method is automatically implemented in the condition that the module is inserted into the base station, so as to ensure the real-time synchronization of all modules inserted in the base station with the base station. The electromyographic signal acquisition process does not depend on wireless networks or limit the scene of use to areas with network coverage, thus reducing the wireless connection power consumption, increasing the cost-efficiency, and greatly improving the synchronization reliability.

The invention discloses a multi-station multi-machine unmanned aerial vehicle ground station control method, which comprises the following steps that: a wireless local area network is used as a communication protocol with an unmanned aerial vehicle for data transmission of a ground base station, and the unmanned aerial vehicle is connected with the ground base station through a data module; sSID and passwords of a wireless local area network are set in all ground base stations, and the SSID and passwords of all the ground base stations are stored on the unmanned aerial vehicle; when the unmanned aerial vehicle enters the wireless local area network signal coverage range of the ground base station, the ground base station is connected with the unmanned aerial vehicle through a data module and controls the unmanned aerial vehicle to fly; wherein the step of controlling the unmanned aerial vehicle comprises the step of sending the GPS coordinate or inertial flight data of the next ground base station to the unmanned aerial vehicle, so that the unmanned aerial vehicle goes to the next ground base station.

The invention discloses a SOCKET communication receiving method for variable-length data packets, which relates to the technical field of computer network data transmission, and comprises the following steps of: establishing a user-defined communication protocol containing a length field, a number field and a CRC-32 checksum field, and matching with a dynamic management mechanism of a double linked list segmented buffer area of a receiving end, so that the data packets with different lengths can be received. According to the method and the device provided by the invention, the efficient receiving of the variable-length data packet is realized, a receiving end predicts the buffer extension amount through a sliding window historical array, and the problems of memory waste, data loss, packet sticking, disorder and the like caused by a traditional fixed buffer are solved by combining incremental CRC-32 verification and segmentation-level accurate retransmission, so that the memory utilization rate and the data transmission integrity are improved.

The invention belongs to the technical field of data communication, and provides a communication protocol system of an electric energy meter and an upper computer, which comprises the upper computer and the electric energy meter, the upper computer is used for acquiring transmission state data of a plurality of historical messages, determining a current baud rate according to the transmission state data, constructing a request frame, and sending the request frame to the electric energy meter according to the current baud rate; the electric energy meter is used for performing correctness verification on first key information in the request frame, if the verification is passed, sending a response frame to the upper computer, analyzing key identification information in the request frame, querying target data according to an analysis result, and constructing and sending a data frame to the upper computer according to the queried target data; and the upper computer is also used for analyzing the data frame to obtain the target data if the data frame is subsequently received and the second key information in the data frame passes the correctness verification after the response frame is received within the set duration. According to the scheme, the stability and convenience of a communication link between the electric energy meter and the upper computer can be improved.

The invention discloses a communication testing device and method for RS485 electrical equipment, and belongs to the technical field of equipment testing. The communication test device of the RS485 electrical equipment comprises a PLC module, a display module and an electrical equipment wiring module, and a plurality of alternative electrical equipment test schemes are stored in the PLC module; a plurality of alternative electrical equipment test schemes are stored in the PLC module, and the acquisition of the communication protocol test parameters of the display module is combined, so that the alternative electrical equipment test schemes can be screened based on different communication protocol test parameters, and the electrical equipment test scheme corresponding to the RS485 electrical equipment to be tested is obtained; communication testing of RS485 electrical equipment with different communication protocols is realized, and low communication testing efficiency caused by the fact that the RS485 electrical equipment with different communication protocols needs to use different testing devices in the prior art is avoided. The system can be compatible with tests of different communication protocols, and improves the communication test efficiency of the ship RS485 electrical equipment.

The invention discloses a method for monitoring dynamic information of an in-band system of a server in real time by a BMC (Baseboard Management Controller), and relates to the technical field of computers, the method comprises the following steps: a host CPU (Central Processing Unit) reads a module list related to the dynamic information of the in-band system of the server to obtain a serial number listed by the module list and used for identifying the type of the dynamic information of the in-band system of the server; the host CPU obtains the dynamic information of the in-band system of the server one by one according to the obtained serial number for identifying the type of the dynamic information of the in-band system of the server; the host CPU calls a transmission channel suitable for a required communication protocol by reading a transmission channel type related to transmission server in-band system dynamic information, and sends the obtained server in-band system dynamic information to a BMC (Baseboard Management Controller) by utilizing the transmission channel suitable for the required communication protocol; and the BMC monitors and displays the dynamic information of the in-band system of the server in real time according to the received dynamic information of the in-band system of the server.

The invention relates to a multi-protocol communication interface chip receiver. The receiver comprises an RS232 receiver and an input switch resistance circuit, wherein the input end of the RS232 receiver is connected with the input switch resistance circuit; the input switch resistance circuit is used for enabling the input end of the RS232 receiver to be in a determined state voltage under the condition that the chip is turned off, and comprises a driving control circuit, a switch grid control and clamping circuit, a switch circuit and an input resistor; the design problem of a multi-protocol communication interface chip caused by incompatibility of the communication protocols of the RS232 receiver and the RS485 receiver in the aspects of common-mode input impedance and the like is solved, and the design of the multi-protocol communication interface chip can be realized.