69 results about "RS-422" patented technology

The invention relates to a reliable data interaction method based on an RS-422 serial bus technique, and with the combination of continuous auto repeat request (Auto Repeat request ARQ) protocol, discloses a novel data interaction and verification method based on the RS-422 serial bus technique. A host computer and a lower computer have a response mechanism and repeat frame verification, and moreover the host computer can continuously transmit a plurality of data frames before receiving a response frame transmitted from the lower computer, copies of the data frames can be stored in transmitting buffer when the data frames are transmitted, and corresponding data frame copies in the buffer can be deleted after the host computer receives the response frame. Until a certain number of data frames which do not receive the response frames are accumulated, the host computer stops to retransmit the data frame copies in the buffer. The utilization rate and the communication speed of a channel can be greatly increased. Aiming at the characteristics of an embedded system, information type recognition codes are added into the data frames for communication of the host computer and the lower computer, so that communication of multiple time sequences, parameters and task instructions of the embedded system can be achieved simultaneously.

A modular and integrated satellite dynamics simulation test system and method, the system is used for the ground simulation test of the small satellite attitude and orbit control system, the small satellite dynamics simulation test system is based on modular construction, including measurement and control upper computer and real-time lower computer . The measurement and control upper computer is a general-purpose computer, which runs the human-computer interaction software of the simulation system; the real-time lower computer includes the chassis, controller, digital signal acquisition and output card, analog signal acquisition and output card, RS‑422 communication card, CAN communication card, power supply Card, interface box, real-time lower computer except the chassis and interface box, all functional module boards are integrated based on the PXI bus, and the lower computer controller runs dynamics simulation calculation software. In addition to the interface box of the real-time lower computer, other modules are integrated inside the chassis. The upper computer and the lower computer are connected through Ethernet, and communicate based on the TCP / IP protocol, and carry out the interaction of operation instructions, collected data and simulation data. The present invention is applied to the simulation test of the attitude-orbit control system of the small satellite, which improves the integration and scalability of the small-satellite attitude-orbit control simulation test equipment, and the deployment of the equipment is simple and fast.

A unique high performance digital video recorder having a number of novel features. The recorder's electronics are all on a unitary printed circuit board. The recorder also requires at least one hard disk drive and audio and video input analog signals (from a source such as video camera or broadcast media) as well as a suitable monitor for receiving output audio and video analog signals. A external time code generator (i.e., VITC digital clock) is also required for synchronization. Also required are various manual control devices (i.e., panel controls) for mode selection. The electronics of the preferred embodiment comprise A-to-D and D-to-A converters, a hard disk interface, a JPEG compression encoder / decoder, a multi-port DRAM and DMA subsystem, a microprocessor with RS-232 and RS-422 access ports, various working memory devices and bus interfaces and a 16-bit stereo digital audio subsystem. Novel features of the preferred embodiment include use of an index table for disk addresses of recorded frames, a multi-port memory controller in the form of a field programmable gate array (FPGA), loop recording using dual channels, and dynamic JPEG compression compensation.

The invention discloses a board level testing system which comprises a testing upper computer, a testing controller and a subrack back panel, wherein the testing upper computer is connected with the testing controller through a data acquisition card and connected with a circuit board to be tested through an Ethernet and RS-232 which are provided by the testing upper computer and RS-485 and RS-422 which are provided by a data communication card; the testing controller is respectively connected with the data acquisition card in the testing upper computer and the subrack back panel and used for carrying out level conversion on an excitation signal required by testing and a testing output signal so as to provide a controlled power supply for the circuit board to be tested and a level conversion circuit; and the subrack back panel is respectively connected with the testing controller and the circuit board to be tested so as to accommodate a testing subrack of the circuit board to be tested. The system can guarantee the protection of the circuit board to be tested during the board level testing, is a computer aid based full-automatic or semi-automatic testing system, can reduce the working intensity of testing personnel, improve the efficiency and reduce testing human error and has higher use value especially for circuit boards with complicated functions.

The invention relates to a simulation device of a load data processor and an implementation method thereof, and belongs to the field of satellite test. The invention aims to solve the problems of high cost, low test safety and reliability and low test efficiency caused by that the test process of the existing satellite data transmission subsystem is performed in the sky. The simulation device of the load data processor comprises a field programmable gate array (FPGA), a signal isolation circuit, a PXI bus interface circuit, a low voltage differential signaling (LVDS) receiving and transmitting interface circuit and an RS-422 data receiving and transmitting circuit, wherein the LVDS receiving and transmitting interface circuit comprises an LVDS receiving interface circuit and an LVDS transmitting interface circuit; and the RS-422 data receiving and transmitting circuit comprises an RS-422 synchronous receiving interface circuit, an RS-422 asynchronous receiving interface circuit and an RS-422 transmitting interface circuit. The simulation device of the load data processor also comprises a static random access memory (SRAM) cache. The simulation device of the load data processor is applied to test of a satellite data transmission subsystem.

An FC-AE-1553 based mixed avionics system tester relates to a mixed avionics system tester and aims to solve the problem that an avionics system mixing various different protocols can not be tested currently. The tester adopts the structure that a fiber transceiver is used for mutual conversion between optical signals and electrical signals; an RS422 / 485 transceiver is used for realizing level conversion and data transmit-receive of RS-422 / 485 signals; an FPGA (Field Programmable Gate Array) is used for performing data interaction with the fiber transceiver, the RS422 / 485 transceiver and the processor; a signal input or output end of an upper computer of the processor is connected with a signal output / input end of the upper computer; a 1553B protocol signal input or output end of the processor is connected with a 1553B protocol signal output or input end of a 1553B protocol chip; and the 1553B protocol chip is in data interaction with an external 1553B summary unit through two isolation transformators. The tester is suitable for testing of the mixed avionics system.

The invention relates to a data receiving, storing and forwarding device suitable for various ports, belongs to the field of communication electronics, and aims to solve the problem that the conventional data receiving, storing and forwarding device has no commonality. An output end of a receiving port circuit of the device is connected with a port selection circuit, wherein an RS232 serial port of the port selection circuit is connected with an RS232 serial port of an FPGA through an RS-232 unit; an RS422 serial port of the port selection circuit is connected with an RS422 serial port of the FPGA through an RS-422 unit; and an RS485 serial port of the port selection circuit is connected with an RS485 serial port of the FPGA through an RS-485 unit; a control and output end of the FPGA is connected with a controlled end of the port selection circuit; a data storage, input and output end of the FPGA is connected with an input and output end of a storage unit; and a forwarding or storing control signal output end of the FPGA is connected with a forwarding or storing control signal input end of a forwarding unit.

The invention discloses a system for cross backup of telemetering and digital transmission data channels for aerospace applications. The system comprises an integrated electronic subsystem, a spaceborne measurement control transponder, a digital transmission subsystem and spaceborne data equipment which are locally arranged on a satellite platform, wherein data transmission channels exist between the spaceborne data equipment and the integrated electronic sub-system and the digital transmission subsystem, and a data transmission channel is established between the integrated electronic sub-system and the digital transmission subsystem through the spaceborne data equipment to achieve the interconnection and multiplexing between a telemetering data download channel and a digital transmission data download channel; the spaceborne data equipment achieves the exchange of the telemetering / remote control data through a measurement control channel and the integrated electronic subsystem, unidirectionally transmits the large-capacity test data to the digital transmission subsystem at high speed through an LVDS data interface, and also achieves a two-way data connection through an RS-422 data interface and the digital transmission subsystem. According to the system disclosed by the invention, the advantages of the telemetering channel and the digital transmission channel are fully combined, the advantage complementation and cross backup of the telemetering channel and the digital transmission channel can be achieved, and the real-time performance and security of the data can be increased.

The invention discloses a device for measuring the external diameter of a heavy-calibre seamless steel pipe on line by using CCD (Charge Coupled Device) cameras. Two CCD cameras are respectively arranged above a rolling line of the heavy-calibre seamless steel pipe; two background light boxes are respectively arranged above the rolling line of the heavy-calibre seamless steel pipe; two CCD cameras are respectively matched with two background light boxes; two CCD cameras and two background light boxes are arranged on a measuring frame; two CCD cameras and two background light boxes are respectively connected with spot operation boxes; the spot operation boxes are connected with RS-422 communication cables or fibers; the RS-422 communication cables or fibers are connected to an industrial control machine of a central station; and the measuring frame is provided with a cooling circulation water system and a compressed air pipeline as well as a 220V alternating current power conditioner. In the invention, an intelligent camera for measuring the external diameter of the heavy-calibre seamless steel pipe applies the binocular vision principle to on-line measurement of the external diameter of the heavy-calibre seamless steel pipe.

The invention provides a multi-channel signal acquisition system compatible with multiple protocols. The system comprises a signal receiving unit, a logic processing unit and a signal transmitting unit. Compatible signals comprise an EnDat protocol signal, a BiSS protocol signal and a quadrature incremental signal. The signal receiving unit comprises multiple RS-422 / 485 input interfaces, and each input interface is corresponding to one dial switch and a corresponding differential circuit. Each input interface determines to receive one of the above three signals through dial switch setting. The logic processing unit is a programmable logic device. The signal transmitting unit comprises an RS-485 output interface, a corresponding differential circuit and a fiber output interface. The data signal received by the input interface is processed by the programmable logic device and then is outputted by the RS-485 interface and a fiber interface. According to the system, the collection of different types of signals is realized by using one interface, the signals are outputted through two modes, the flexibility and practicality of a data acquisition system are greatly enhanced, and different data collection requirements can be satisfied.

The invention discloses an airborne multipath audio and video synchronization recorder and a recording method, the recorder comprises a motherboard unit, a channel selector switch and a compression record unit, the motherboard unit comprises a DSP core controlling and data processing circuit and a compression record module slot used for connecting the compression record unit, the channel selector switch receivers multipath video signals, and the multipath video signals are subjected to time sharing multiplexing into a video differential signal and then sent to the motherboard unit, the motherboard unit receives a GPS time signal and a flight signal sent by a RS 422 bus connection integrated information processing machine, the DSP core controlling and data processing circuit performs sequential control, and then the GPS time signal and the flight signal are sent to the compression record unit, and the compression record unit is connected to a memory cell. The airborne multipath audio and video synchronization recorder has the advantages of small volume, low cost and simple structure, and can realize synchronous record and playback of the airborne multipath audio and video.

The invention relates to a device and method for monitoring the tension of an underwater umbilical cable in an ocean device. The device comprises a connecting device, a clamp, a steel cable hanging net and a tension monitoring sensor, wherein the connecting device, the upper end and the lower end of the steel cable hanging net, and the tension monitoring sensor are located on the same plumb line, the connecting device, the clamp and the steel cable hanging net are used for being connected with and fixing the umbilical cable, the tension monitoring sensor is arranged below the connecting device and connected to an instrument bin of a submersible device through a signal line and a watertight connector, a computer in the instrument bin is communicated with a water surface computer through an RS-422 communication interface, and voltage signals of the tension of the umbilical cable are transmitted to the computer in the instrument bin by the tension monitoring sensor and then are transmitted to the water surface computer through the umbilical cable. By means of the method and device, the tension of the underwater umbilical cable can be monitored and is prevented from exceeding a threshold value, necessary information can be provided for the operation of operation personnel in time so that the fatigue cracks of the umbilical cable and the operation accidents of the submersible device can be avoided, and the operation safety of a body of the submersible device can be ensured.

Provided is a mixed-mode multi-protocol serial interface driver. The driver can work in the current mode or the voltage mode or work in the two modes at the same time. The driver comprises a circuit used for making an output signal conform to one of a series of selectable electrical interface standards including the CCITT / EIA standards V.35, V.11 / RS-422, V.28 / RS-232 and V.10 / RS-423. When the specific standard is selected for an input signal through mode selection, a proper portion in the circuit can start response. Part of the circuit can not be placed in a high-impedance state, and the part of the circuit is prevented from interfering with the portion, starting the response, of the circuit.

The invention provides a moonlet multi-bus multi-passage communication monitoring device and a monitoring method thereof, which relate to a communication monitoring device and a monitoring method thereof. The invention is provided by aiming at solving the problems that the monitoring device can only monitor the bus modes of the same type, in addition, the monitored passages are few. The data signal output end and the data signal input end of an interface module of each path of CAN bus respectively correspond to the signal input end and the signal output end of one path of CAN bus of a first monitoring control module, the interface module of each path of CAN bus respectively receives a path of CAN bus signals from an external bus, the data signal output end and the data signal input end of an interface module of each path of RS-422 bus respectively correspond to the signal input end and the signal output end of one path of RS-422 bus of a second monitoring control module, and the interface module of each path of RS-422 bus respectively receives one path of RS-422 bus signals. The invention can monitor two kinds of buses, can simultaneously monitor multi-passage data, and can be widely applied to various occasions needing simultaneous monitoring of multi-passage data.

The invention discloses an integrated avionic system capable of enhancing the system integration degree and guaranteeing the safety and reliability of an aircraft while the total weight is reduced. The integrated avionic system comprises a first integrated display control unit and a second integrated display control unit, a first data interface unit and a second data interface unit, a dual-redundancy atmosphere data system, an INS / GNSS integrated navigation system, an integrated radio system, a head-up display unit and a cockpit monitoring system; the integrated display control units are arranged as an integrated structure with a processor and a display, are used for displaying a flying state and navigation information and are used for receiving a control operation instruction of a pilot by using a touch screen and a physical key; the data interface units are used for independently performing data collection, data processing and data distribution, wherein the data collection comprisesobtaining data generated by each airborne equipment and state data of each airborne equipment by using an RS-422 bus and an Ethernet network; and the data processing comprises unpacking and packing the collected data according to the setting of target equipment.

The invention discloses an FPGA-based multi-CCD high-speed, high-accuracy and wide-range industrial grade laser triangulation distance measuring instrument. A laser device emits a laser beam, the laser beam is illuminated to a measured object after passing through a convergence lens to form a light spot, the light spot scatters on the surface of the measured object, one part of scattered light passes through a receiving lens and is imaged on a linear array CCD drive board, a light enveloping signal generated by the linear array CCD drive board is sent to an FPGA control board, a CCD drive module is in one-way connection with a pixel position and distance calculation module, the pixel position and distance calculation module is in one-way connection with a liquid crystal display drive module, a D / A conversion drive module and an RS-422 communication module respectively, and a constant-temperature cavity temperature measuring drive module is in one-way connection with a heating and refrigeration control module and a digital potentiometer drive module respectively. The FPGA-based multi-CCD high-speed, high-accuracy and wide-range industrial grade laser triangulation distance measuring instrument has the characteristics of rapid system response speed, high measurement accuracy, wide distance measurement range, capability of measuring a high-temperature object, strong interference resistant capability and the like.

The invention discloses a navigation and interface computer based on dual-DSP and CPLD. The navigation and interface computer is applied to a rotary inertial navigation system constructed by a gyroscope taking RS-422 as the output, an accelerometer and an angular measurement device taking quadrature coding pulse as the output as well as other inertial navigation systems. The navigation and interface computer mainly comprises a DSP1 module, a DSP2 module, a CPLD module, a dual-port RAM module, an Ethernet interface module, a MIL-STD-1553B interface module, an ARINC-429 interface module and an expanded RS-422 interface module. The DSP1 module is mainly used for synchronous acquisition of inertial sensors and synchronous reading of the signal of the angular measurement device; the DSP2 module is mainly used for coordinated communication of the external MIL-STD-1553B, ARINC-429 and expanded RS-422; and the CPLD module is mainly used for signal acquisition of the angular measurement device and assistance of the DSP2 module. The navigation and interface computer disclosed by the invention is compact in circuit structure and high in expandability and can be widely applied to various inertial navigation systems.

The invention relates to a general network structure, in particular to an interaction system of RS-232 and RS-422 / RS-485 for industrial control and a universal network adapter. The universal network adapter has two interfaces: a first bus interface and a second bus interface. The first bus interface is used for monitoring data flows, containing address information, broadcasted by a host computer;the second bus interface is responsible for data exchange between a main application of the host computer and a remote station; the opening of the second bus interface is controlled by the network adapter according to the address information received by the first bus interface; and a singlechip completes the data reception and transmission of the first bus interface and the control of the second bus interface. The universal network adaptor can uniformly convert the communication interfaces of the same protocol or different protocols of the equipment of the same kind or different kinds from thesame manufacturer or different manufacturers into RS-422 / RS-485 and assigns address to form a star, ring, bus or hybrid industrial control network while greatly increasing communication distance andfacilitating centralized monitoring and management.

The invention discloses an MSP85 mode panel-selecting driving tester, comprising a tester box body, twelve signal indicator lights L1-L12, an RS 422-TX test hole, an RS 422-RX test hole, an APP BUS test hole, an ADJUST LIGHT potentiometer, an RESET button, three discrete input switches (TEST, AP-XFR and TURB), an SELF TEST self test switch, a power module, a circuit board positioned in the box body, a 37-core D-joint J1 and a 9-core RS232 joint, wherein the power module comprises a power switch and a power input port, and the circuit board comprises a microprocessor, an RS 422 level translator and an RS 232 interface chip. The MSP85 mode panel-selecting driving tester has the advantages of considerably simple integral structure, considerably low cost and capability of meeting the requirements on users under different conditions.

The invention provides a universal serial bus-balanced voltage digital interface converter. The universal serial bus-balanced voltage digital interface converter comprises a USB interface unit, a USB-serial signal converting unit, an RS-422 signal processing unit, an RS-422 interface and a signal isolating unit. The signal isolating unit is arranged between the USB-serial signal converting unit and the RS-422 signal processing unit and used for electrically isolating a signal between the USB-serial signal converting unit and the RS-422 signal processing unit. By means of the technical isolation scheme, compared with the prior art and on the premise that a normal communication function and the signal transmission quality are guaranteed, the electrical connection between a computer and a programmable logic controller (PLC) on a signal transmission line is switched off, and accordingly the stoppage that a communication chip is burned down due to electricity leakage is completely eradicated.

The invention discloses a multi-channel real-time data acquisition system. The system comprises an FPGA controller and a data transmission module. A bidirectional port of the FPGA controller is electrically connected with three A / D converters through control lines. Two of the A / D converters receive control signals processed through a signal conditioning circuit, and the other A / D converter receives a switch signal processed by the signal conditioning circuit. Control signals of the channels are directly subjected to signal conditioning and then parallelly acquired at the high speed by other two A / D conversion circuits. Multiple paths of control signals of other channels are selected through multiple paths of switches, so board area is reduced and hardware resources are saved. The output end of the FPGA controller is connected with a data transmission FPGA control circuit through an LVDS high speed serial communication circuit. Data interaction is achieved for feedback data directly through an RS-422 communication and multi-shaft moving control system. The feedback data is then transmitted to a main control computer at the high speed through a PCI bus, so high-speed large-capacity data detection is achieved and data processing efficiency is improved.

The invention discloses a temperature measuring device based on a tunable light source and a fiber bragg grating. The temperature measuring device comprises an optical module, a fiber bragg grating sensor array and the like. The fiber bragg grating sensor array is connected to the optical module, the optical module is connected with a light source driving module, and the light source driving module is connected with a data acquisition and processing module. The collected and processed signals are sent to a demodulation module for algorithm demodulation, the temperature information after the demodulation is sent to an interface communication module through the data acquisition and processing module and transmitted to an upper computer through an RS-422 to display a measured temperature value in real time. The temperature measuring device is based on a tunable light source principle and has the advantages that the overall temperature measuring device is small in size, high in integration, simple in light path connection and high in reliability, a measuring sensor device is a passive device, and the temperature information of measured points can be transmitted over long distances by optical fibers and integrated with multiple sensors by one fiber; and the temperature measuring device can be applied to different measuring occasions and can avoid the defects of poor anti-electromagnetic interference ability in traditional electrical temperature measurement and the like, the implementation method is flexible and fast, and the universality is high.

The invention provides a multiprotocol compatible multipath signal acquisition system. The system comprises a signal receiving unit, a logic processing unit, a signal transmitting unit and an upper computer. Compatible signals include three types of signals of an EnDat protocol signal, a BiSS protocol signal and an orthogonal increment signal. The signal receiving unit comprises multiple RS-422 / 485 input interfaces and corresponding difference circuits. The logic processing unit is a programmable logic device. The signal transmitting unit comprises an optical fiber output interface, an RS-485 output interface and a corresponding difference circuit. The upper computer is provided with various interfaces which can receive any signals of the three types of signals. The data signals received by the input interfaces are processed by the programmable logic device and then outputted by the RS-485 interface and the optical fiber interface respectively. Acquisition of different types of signals is realized by utilizing one interface and the signals are outputted by two modes so that flexibility and practicality of the signal acquisition system can be greatly increased, and thus the signal acquisition system can meet different signal acquisition requirements.

The present invention discloses a locomotive electronic control air brake system central control unit based on microcomputer network control. The control unit forms the core part of an ECP system, and comprises a power module, a network card module, an IO module, a CPU control module and a communication module, etc. Through adoption of a front outgoing line mode, the work of an HEU device with the AAR4200 standard is mainly completed to perform communication of other control portions on the locomotive (such as CCU and brake) to obtain an ECP system initialization and control command and collect the vehicle state so as to complete the functions of ECP fault diagnosis and ECP system operation log recording, etc. The ECU has an MVB port to connect with a locomotive bus, and has a synchronization high-speed RS-422 interface and an asynchronization communication interface to connect with the BCU and the display screen of the brake system.

The invention belongs to the technical field of asynchronous serial communication and discloses a high-speed serial port communication method used for multi-type interface heterogeneous interconnection. According to the method, a sending unit and a reception unit are achieved in an FPGA, wherein the sending unit consists of a sending shift register, a sending data buffer area, a local gating switch, a channel state register and a channel number register, and the reception unit includes a receiving gating switch, a sampling clock counter, a receiving shift register and a receiving data buffer area. The method is characterized in that the communication method includes a sending part and a reception part and has the advantages of simple design, low power consumption, high efficiency, high reliability and high flexibility; compared with an Ethernet, a PCI Express and an RAPIDIO protocol, the method can effectively reduce the complexity of control information during information transmission; compared with RS-422 and a CAN, the method has the advantages of high flexibility and a higher transmission speed rate.

The invention relates to an interface circuit capable of configuring full-duplex / half-duplex software, wherein an automatic control switch replaces a jumper wire in the current universal RS-422 / RS-485 plate circuit, so as to match with the full-duplex / half-duplex software to realize the full-duplex / half-duplex configuration in the RS-422 / RS-485 plate circuit. Therefore, the interface circuit has simple operation, fast response and good reliability, saves the labor, improves the working efficiency and can complete a functional circuit BIT.

The invention discloses a capacitance principle-based online rapid micro oil film thickness calibration system and method. The system comprises a test piece, a capacitive sensor, a signal conditioningmodule, an integrated processing host and a computer, wherein the capacitive sensor is mounted on the test piece and is coated with a layer of surface streamline repair agent to form a fill coating;the capacitive sensor is connected with the signal conditioning module through a sensor signal line; the signal conditioning module is placed in the integrated processing host; and the integrated processing host is connected with the computer through an RS-422 or USB communication line. The system is capable of solving the problem of how to improve the calibration accuracy when the thicknesses ofoil films on the wall surfaces of aircraft are measured by the capacitive sensor in wind tunnel experiments; and through the system, online rapid and correct calibration schemes can be designed so asto obtain oil film thickness correction curves.

The invention discloses cab integrated radio communication equipment adopting a listing command mode, wherein a host machine is formed by a control part and a radio station part; the control part of the host machine comprises a main control unit which is formed by a micro processor, the main control unit is connected with the radio station part through a recommended standard (RS)-232 communiation interface, and the main control unit is communicated with an operating display terminal through an RS-422 communiation interface; a master control program signaling mode which is operated in the main control unit adopts the listing command mode; and the main control unit and a man-machine interface (MMI) have agreement on basic software, the MMI does not need to be informed of the number of functional items before an operator needs to use the corresponding function, the main control unit receives a listing inquiry command and then collects all the functional items to generate a list to be fed back to the MMI through the listing command, and multi-packet delivery is supported for the feedback of the listing command. The equipment is suitable for various applications of all the railway bureaus with various line differences; and when additional requirement is generated, the master control program is only needed to be upgraded in a universal series bus flash disk mode for satisfying the requirement, so the equipment is simple to operate and has high efficiency, and the workload of maintenance personnel is reduced.

The invention, which belongs to the technical field of electronic communication, relates to an integrated-packaging-based multifunctional interface circuit. The circuit comprises a level conversion unit, a switching value control unit, an optocoupler signal isolation unit, an LVDS transceiver unit, an RS-422 communication interface transceiver unit, an ARINC 429 bus interface transceiver unit, anda 1553B bus communication control unit. On the basis of the integrated packaging, single-cavity multi-layer wiring integration of a plurality of components is realized; because all function units arepackaged into one cavity, compared with the existing packaging system structure, the circuit is integrated with multiple functions with a reduced circuit packaging dimension; and the requirement of the H standard military quality level in the GJB2438A-2002 "hybrid integrated circuit general specifications" can be met.

The SFP interface circuit compatible with the network module and the serial signal module comprises an SFP interface circuit. The SFP interface circuit comprises a module type identification circuit,a power supply selection module, a power supply filter, a multi-path signal switching module, a serial signal conversion circuit, a network interface circuit, a network interface auxiliary circuit andan SFP seat interface. According to the invention, the TTL interface , the RS- 232 interface and RS-422 interface, the air contact interface, the single-mode optical fiber interface and the multimodeoptical fiber interface are designed into SFP type modules compatible with the network interface, so that the device using the interfaces in parallel is reduced in size, simplified in structure, easyto implement, flexible and variable in interface configuration and enhanced in adaptability.