{"id":34619,"date":"2026-08-07T13:09:39","date_gmt":"2026-08-07T05:09:39","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&p=34619"},"modified":"2026-08-27T19:48:24","modified_gmt":"2026-08-27T11:48:24","slug":"pcie-8431-2","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pcie-8431-2\/","title":{"rendered":"PCIe-8431\/2"},"content":{"rendered":"

Product Introduction<\/h3>\n

\n\u0417\u0435\u043c\u043b\u044f NI PCIe-8431\/2<\/strong> \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 2-port RS-485\/RS-422 serial interface device<\/strong> designed for industrial communication, automated test, instrument control, production systems, laboratory automation, and integration of serial devices.\n<\/p>\n

\nThe PCIe-8431\/2 combines two independent RS-485\/RS-422 serial ports with a PCI Express host interface. It supports communication rates up to 3 Mb\/s<\/strong> and provides flexible serial communication for industrial and test applications.\n<\/p>\n

\nWith support for RS-485 and RS-422 communication, the PCIe-8431\/2 is suitable for systems requiring differential signaling, reliable communication in electrically noisy environments, or longer communication distances than conventional RS-232 interfaces.\n<\/p>\n

Product Overview<\/h3>\n

\n\u0417\u0435\u043c\u043b\u044f National Instruments PCIe-8431\/2<\/strong> provides two serial interfaces for connecting a PCI Express computer to compatible RS-485 or RS-422 equipment.\n<\/p>\n

\nA typical system architecture is:\n<\/p>\n

\nHost Computer \u2192 PCI Express \u2192 PCIe-8431\/2 \u2192 RS-485 \/ RS-422 \u2192 Instrument \/ Controller \/ DUT<\/strong>\n<\/p>\n

\nThe two-port configuration is particularly useful for automated test and industrial systems that require multiple serial connections without the higher channel density of 8-port or 16-port serial cards.\n<\/p>\n

Key Features<\/h3>\n

Two RS-485\/RS-422 Serial Ports<\/h4>\n

\nThe PCIe-8431\/2 provides two serial communication ports<\/strong> supporting RS-485 and RS-422.\n<\/p>\n

\nEach port can be used to communicate with compatible industrial devices, instruments, controllers, or embedded systems.\n<\/p>\n

RS-485 Communication<\/h4>\n

\nThe PCIe-8431\/2 supports RS-485 differential serial communication<\/strong>.\n<\/p>\n

\nRS-485 is widely used in industrial environments because it provides good noise immunity and can support multi-device network architectures.\n<\/p>\n

\nTypical RS-485 applications include:\n<\/p>\n

    \n
  • \u041f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0430\u044f \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0430\u0446\u0438\u044f<\/li>\n
  • \u0423\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043c\u0430\u0448\u0438\u043d\u043e\u0439<\/li>\n
  • Process equipment<\/li>\n
  • Distributed sensors<\/li>\n
  • Production equipment<\/li>\n
  • \u0410\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f<\/li>\n
  • Building automation<\/li>\n<\/ul>\n

    RS-422 Communication<\/h4>\n

    \nThe PCIe-8431\/2 also supports RS-422<\/strong>, providing differential serial communication for compatible instruments, controllers, and industrial devices.\n<\/p>\n

    \nRS-422 is commonly used where reliable point-to-point or multidrop differential communication is required.\n<\/p>\n

    Up to 3 Mb\/s Serial Communication<\/h4>\n

    \nThe PCIe-8431\/2 supports serial communication rates up to 3 Mb\/s<\/strong>.\n<\/p>\n

    \nThis provides substantially higher potential throughput than conventional low-speed serial communication and makes the device suitable for demanding industrial and automated test applications.\n<\/p>\n

    2-Wire RS-485 Operation<\/h4>\n

    \nThe PCIe-8431\/2 supports 2-wire RS-485<\/strong> configurations.\n<\/p>\n

    \nIn a typical 2-wire network, the same differential pair is shared for transmitting and receiving data, providing half-duplex communication.\n<\/p>\n

    4-Wire Communication<\/h4>\n

    \nThe device also supports 4-wire communication<\/strong> configurations using separate differential transmit and receive pairs.\n<\/p>\n

    \nThis architecture can support full-duplex communication with compatible RS-485 or RS-422 equipment.\n<\/p>\n

    Half-Duplex and Full-Duplex Operation<\/h4>\n

    \nDepending on the wiring and connected device, the PCIe-8431\/2 can be used in both half-duplex and full-duplex<\/strong> serial communication systems.\n<\/p>\n

    \nThis flexibility allows the same interface to support a broad range of industrial communication architectures.\n<\/p>\n

    PCI Express Interface<\/h4>\n

    \nThe PCIe-8431\/2 installs into a compatible PCI Express<\/strong> expansion slot.\n<\/p>\n

    \nA typical installation is:\n<\/p>\n

    \nIndustrial PC \u2192 PCI Express Slot \u2192 PCIe-8431\/2 \u2192 Serial Cable \u2192 External Equipment<\/strong>\n<\/p>\n

    \nThis internal interface architecture is particularly suitable for permanently installed test stations, industrial computers, and rackmount systems.\n<\/p>\n

    High-Performance Data Transfer<\/h4>\n

    \nThe PCIe-8431 family is designed for high-performance serial communication and efficient data transfer between the serial interfaces and host computer.\n<\/p>\n

    \nThis architecture is useful when multiple serial channels must continuously transmit and receive data during automated testing or industrial operation.\n<\/p>\n

    Standard Serial Port Integration<\/h4>\n

    \nCompatible NI serial software allows the PCIe-8431\/2 ports to be accessed using standard serial communication programming methods.\n<\/p>\n

    \nThis simplifies integration with existing applications designed to communicate with COM-style serial interfaces.\n<\/p>\n

    Technical Specifications<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    \u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440<\/th>\n\u0421\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f<\/th>\n<\/tr>\n
    Product Type<\/td>\nSerial Interface Device<\/td>\n<\/tr>\n
    \u041c\u043e\u0434\u0435\u043b\u044c<\/td>\nPCIe-8431\/2<\/td>\n<\/tr>\n
    Manufacturer<\/td>\n\u041d\u0430\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0435 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b<\/td>\n<\/tr>\n
    Host Interface<\/td>\nPCI Express<\/td>\n<\/tr>\n
    Serial Interface<\/td>\nRS-485 \/ RS-422<\/td>\n<\/tr>\n
    Number of Serial Ports<\/td>\n2<\/td>\n<\/tr>\n
    Maximum Baud Rate<\/td>\nUp to 3 Mb\/s<\/td>\n<\/tr>\n
    Communication Modes<\/td>\nHalf-Duplex \/ Full-Duplex<\/td>\n<\/tr>\n
    RS-485 Wiring<\/td>\n2-Wire \/ 4-Wire<\/td>\n<\/tr>\n
    Signaling<\/td>\nDifferential<\/td>\n<\/tr>\n
    \u0418\u0437\u043e\u043b\u044f\u0446\u0438\u044f<\/td>\nNon-Isolated<\/td>\n<\/tr>\n
    Primary Function<\/td>\nRS-485 \/ RS-422 Serial Communication<\/td>\n<\/tr>\n
    \u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f<\/td>\nIndustrial Automation, Automated Test, Instrument Control and Serial Data Communication<\/td>\n<\/tr>\n<\/table>\n

    How Does the PCIe-8431\/2 Work?<\/h3>\n

    \nThe PCIe-8431\/2 provides an interface between software running on a host computer and external equipment using RS-485 or RS-422.\n<\/p>\n

    \nFor transmitted data:\n<\/p>\n

    \nApplication \u2192 Serial Driver \u2192 PCIe-8431\/2 \u2192 RS-485 \/ RS-422 \u2192 External Device<\/strong>\n<\/p>\n

    \nFor received data:\n<\/p>\n

    \nExternal Device \u2192 RS-485 \/ RS-422 \u2192 PCIe-8431\/2 \u2192 Serial Driver \u2192 Application<\/strong>\n<\/p>\n

    \nThis bidirectional communication allows the computer to configure equipment, transmit commands, collect measurements, monitor device status, and automate industrial processes.\n<\/p>\n

    What Is RS-485?<\/h3>\n

    \nRS-485<\/strong> is a differential serial communication standard widely used in industrial automation and control systems.\n<\/p>\n

    \nCompared with RS-232, RS-485 generally provides:\n<\/p>\n

      \n
    • Better electrical noise immunity<\/li>\n
    • Longer practical communication distances<\/li>\n
    • Differential signaling<\/li>\n
    • Multi-device network capability<\/li>\n
    • Better suitability for industrial environments<\/li>\n<\/ul>\n

      \nThese characteristics make RS-485 one of the most widely used physical-layer standards for industrial serial communication.\n<\/p>\n

      What Is RS-422?<\/h3>\n

      \nRS-422<\/strong> is another differential serial communication standard used in industrial, instrumentation, and control applications.\n<\/p>\n

      \nIt provides separate differential signaling and is commonly used when reliable communication over longer distances or in electrically noisy environments is required.\n<\/p>\n

      RS-485 vs RS-422<\/h3>\n\n\n\n\n\n\n\n\n
      \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nRS-485<\/th>\nRS-422<\/th>\n<\/tr>\n
      Signaling<\/td>\nDifferential<\/td>\nDifferential<\/td>\n<\/tr>\n
      Multi-Device Networks<\/td>\nWell Suited<\/strong><\/td>\nMore Limited<\/td>\n<\/tr>\n
      2-Wire Operation<\/td>\nCommon<\/strong><\/td>\nTypically Not Used<\/td>\n<\/tr>\n
      4-Wire Operation<\/td>\nSupported<\/td>\nCommon<\/strong><\/td>\n<\/tr>\n
      Noise Immunity<\/td>\nHigh<\/td>\nHigh<\/td>\n<\/tr>\n
      \u041f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u044b\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f<\/td>\nVery Common<\/strong><\/td>\nCommon<\/td>\n<\/tr>\n<\/table>\n

      2-Wire vs 4-Wire Communication<\/h3>\n\n\n\n\n\n\n\n
      \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n2-Wire<\/th>\n4-Wire<\/th>\n<\/tr>\n
      Differential Pairs<\/td>\n1<\/td>\n2<\/td>\n<\/tr>\n
      Transmit and Receive<\/td>\nShared Pair<\/td>\nSeparate Pairs<\/td>\n<\/tr>\n
      Typical Mode<\/td>\nHalf-Duplex<\/td>\nFull-Duplex<\/td>\n<\/tr>\n
      Wiring Complexity<\/td>\nLower<\/strong><\/td>\nHigher<\/td>\n<\/tr>\n
      Simultaneous TX\/RX<\/td>\nNo<\/td>\n\u0414\u0430<\/strong><\/td>\n<\/tr>\n<\/table>\n

      \nThe appropriate wiring configuration depends on the external equipment and serial network architecture.\n<\/p>\n

      Two-Port Serial Architecture<\/h3>\n

      \nThe PCIe-8431\/2 provides two independent serial interfaces.\n<\/p>\n

      \n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:\n<\/p>\n

      \nPort 1 \u2192 Industrial Controller<\/strong>
      \nPort 2 \u2192 Test Instrument<\/strong>\n<\/p>\n

      \nThis allows one computer to communicate with multiple devices without requiring separate serial adapters.\n<\/p>\n

      \u041f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0430\u044f \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0430\u0446\u0438\u044f<\/h3>\n

      \nThe PCIe-8431\/2 is well suited for industrial automation applications requiring reliable differential serial communication.\n<\/p>\n

      \nCompatible equipment can include:\n<\/p>\n

        \n
      • PLCs<\/li>\n
      • Industrial controllers<\/li>\n
      • Motor controllers<\/li>\n
      • Sensors<\/li>\n
      • Machine controllers<\/li>\n
      • Process equipment<\/li>\n
      • Industrial instruments<\/li>\n<\/ul>\n

        \nA typical architecture is:\n<\/p>\n

        \nIndustrial PC \u2192 PCIe-8431\/2 \u2192 RS-485 Network \u2192 Industrial Devices<\/strong>\n<\/p>\n

        Automated Test Applications<\/h3>\n

        \nThe PCIe-8431\/2 can integrate RS-485 and RS-422 devices into automated test systems.\n<\/p>\n

        \nA complete test platform may include:\n<\/p>\n

          \n
        • PCIe-8431\/2 serial interface<\/li>\n
        • DAQ devices<\/li>\n
        • \u0426\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u0432\u0432\u043e\u0434-\u0432\u044b\u0432\u043e\u0434<\/li>\n
        • Oscilloscopes or digitizers<\/li>\n
        • Programmable power supplies<\/li>\n
        • Electronic loads<\/li>\n
        • Switch systems<\/li>\n
        • DUT fixtures<\/li>\n<\/ul>\n

          \nTest software can coordinate serial communication with measurement and stimulus hardware to automate DUT validation.\n<\/p>\n

          Instrument Control<\/h3>\n

          \nCompatible instruments with RS-485 or RS-422 interfaces can be controlled through the PCIe-8431\/2.\n<\/p>\n

          \nTypical instrument-control operations include:\n<\/p>\n

            \n
          • Sending configuration commands<\/li>\n
          • Starting measurements<\/li>\n
          • Reading measurement data<\/li>\n
          • Monitoring equipment status<\/li>\n
          • Changing operating parameters<\/li>\n
          • Logging serial data<\/li>\n<\/ul>\n

            Production Test<\/h3>\n

            \nProduction test stations can use the PCIe-8431\/2 to communicate with DUTs, fixtures, controllers, and test equipment through RS-485 or RS-422.\n<\/p>\n

            \nA typical sequence can include:\n<\/p>\n

              \n
            1. Initialize the serial interface.<\/li>\n
            2. Configure baud rate and communication parameters.<\/li>\n
            3. Send initialization commands to the DUT.<\/li>\n
            4. Perform required measurements.<\/li>\n
            5. Read DUT response data.<\/li>\n
            6. Compare results against test limits.<\/li>\n
            7. Record the test result.<\/li>\n<\/ol>\n

              Serial Communication Parameters<\/h3>\n

              \nThe PCIe-8431\/2 and connected equipment must use compatible serial communication settings.\n<\/p>\n

              \nImportant parameters include:\n<\/p>\n

                \n
              • Baud rate<\/li>\n
              • Data bits<\/li>\n
              • Parity<\/li>\n
              • Stop bits<\/li>\n
              • Flow control<\/li>\n
              • 2-wire or 4-wire mode<\/li>\n
              • Half-duplex or full-duplex operation<\/li>\n
              • Termination<\/li>\n
              • Biasing<\/li>\n<\/ul>\n

                RS-485 Network Termination<\/h3>\n

                \nCorrect termination is important for reliable RS-485 communication, especially when using higher baud rates or longer cables.\n<\/p>\n

                \nWhen designing the network, consider:\n<\/p>\n

                  \n
                • Termination resistance<\/li>\n
                • Cable impedance<\/li>\n
                • Network topology<\/li>\n
                • Cable length<\/li>\n
                • Communication speed<\/li>\n
                • Number of connected nodes<\/li>\n
                • Stub length<\/li>\n<\/ul>\n

                  \nIncorrect termination can cause signal reflections, intermittent communication errors, corrupted data, or complete communication failure.\n<\/p>\n

                  RS-485 Biasing<\/h3>\n

                  \nSome RS-485 networks require bias resistors to maintain a known bus state when no transmitter is actively driving the network.\n<\/p>\n

                  \nBiasing requirements depend on the connected devices, network topology, termination configuration, and transceiver architecture.\n<\/p>\n

                  Communication Distance<\/h3>\n

                  \nRS-485 and RS-422 can generally communicate over longer distances than conventional RS-232.\n<\/p>\n

                  \nHowever, practical communication distance depends on:\n<\/p>\n

                    \n
                  • Baud rate<\/li>\n
                  • Cable quality<\/li>\n
                  • Cable impedance<\/li>\n
                  • Electrical noise<\/li>\n
                  • Network topology<\/li>\n
                  • Termination<\/li>\n
                  • Connected transceivers<\/li>\n
                  • Installation environment<\/li>\n<\/ul>\n

                    \nHigher communication rates generally require greater attention to cable quality and network design.\n<\/p>\n

                    PCIe-8431\/2 vs PCIe-8430\/2<\/h3>\n

                    \nThe PCIe-8431\/2 and PCIe-8430\/2 are both two-port PCI Express serial interfaces, but they support different electrical standards.\n<\/p>\n\n\n\n\n\n\n\n\n\n
                    \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nPCIe-8431\/2<\/th>\nPCIe-8430\/2<\/th>\n<\/tr>\n
                    Serial Interface<\/td>\nRS-485 \/ RS-422<\/strong><\/td>\n\u0420\u0421-232<\/td>\n<\/tr>\n
                    Serial Ports<\/td>\n2<\/td>\n2<\/td>\n<\/tr>\n
                    Signaling<\/td>\nDifferential<\/strong><\/td>\nSingle-Ended<\/td>\n<\/tr>\n
                    Maximum Baud Rate<\/td>\nUp to 3 Mb\/s<\/strong><\/td>\nModel Dependent<\/td>\n<\/tr>\n
                    Multi-Device Networks<\/td>\nWell Suited<\/strong><\/td>\nPrimarily Point-to-Point<\/td>\n<\/tr>\n
                    Industrial Noise Immunity<\/td>\nHigher<\/strong><\/td>\nLower<\/td>\n<\/tr>\n
                    Primary Application<\/td>\nIndustrial Serial Communication<\/td>\nRS-232 Instrument Control<\/td>\n<\/tr>\n<\/table>\n

                    PCIe-8431\/2 vs PCIe-8431\/4<\/h3>\n\n\n\n\n\n\n\n
                    \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nPCIe-8431\/2<\/th>\nPCIe-8431\/4<\/th>\n<\/tr>\n
                    Serial Standard<\/td>\nRS-485 \/ RS-422<\/td>\nRS-485 \/ RS-422<\/td>\n<\/tr>\n
                    Serial Ports<\/td>\n2<\/strong><\/td>\n4<\/td>\n<\/tr>\n
                    Maximum Baud Rate<\/td>\nUp to 3 Mb\/s<\/td>\nUp to 3 Mb\/s<\/td>\n<\/tr>\n
                    Host Interface<\/td>\nPCI Express<\/td>\nPCI Express<\/td>\n<\/tr>\n
                    Best Application<\/td>\nLow Port Count Systems<\/strong><\/td>\nMedium Port Count Systems<\/td>\n<\/tr>\n<\/table>\n

                    PCIe-8431\/2 vs PCIe-8431\/16<\/h3>\n

                    \nBoth devices belong to the same RS-485\/RS-422 serial interface family. The major difference is channel density.\n<\/p>\n\n\n\n\n\n\n\n
                    \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nPCIe-8431\/2<\/th>\nPCIe-8431\/16<\/th>\n<\/tr>\n
                    Serial Standard<\/td>\nRS-485 \/ RS-422<\/td>\nRS-485 \/ RS-422<\/td>\n<\/tr>\n
                    Serial Ports<\/td>\n2<\/strong><\/td>\n16<\/strong><\/td>\n<\/tr>\n
                    Maximum Baud Rate<\/td>\nUp to 3 Mb\/s<\/td>\nUp to 3 Mb\/s<\/td>\n<\/tr>\n
                    Host Interface<\/td>\nPCI Express<\/td>\nPCI Express<\/td>\n<\/tr>\n
                    Best Application<\/td>\nTwo-Device \/ Low-Port Systems<\/td>\nHigh-Density Serial Systems<\/td>\n<\/tr>\n<\/table>\n

                    \nFor applications requiring only one or two independent serial interfaces, the PCIe-8431\/2 avoids the unnecessary channel density of a 16-port device.\n<\/p>\n

                    PCIe-8431\/2 vs Isolated RS-485 Interface<\/h3>\n

                    \nThe PCIe-8431\/2 is intended for applications where a standard non-isolated RS-485\/RS-422 interface is appropriate.\n<\/p>\n

                    \nFor applications with significant ground-potential differences or where electrical isolation is required, an isolated serial interface should be considered.\n<\/p>\n

                    \nIsolation can be valuable when:\n<\/p>\n

                      \n
                    • Ground loops are possible<\/li>\n
                    • Equipment uses different ground references<\/li>\n
                    • Electrical noise is severe<\/li>\n
                    • Devices are physically distributed<\/li>\n
                    • Additional electrical protection is required<\/li>\n<\/ul>\n

                      PCIe-8431\/2 vs USB RS-485 Adapter<\/h3>\n\n\n\n\n\n\n\n
                      \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nPCIe-8431\/2<\/th>\nTypical USB RS-485 Adapter<\/th>\n<\/tr>\n
                      Host Connection<\/td>\nInternal PCI Express<\/strong><\/td>\nExternal USB<\/td>\n<\/tr>\n
                      Serial Ports<\/td>\n2<\/td>\nModel Dependent<\/td>\n<\/tr>\n
                      Maximum Speed<\/td>\nUp to 3 Mb\/s<\/td>\nDevice Dependent<\/td>\n<\/tr>\n
                      Permanent Installation<\/td>\nWell Suited<\/strong><\/td>\nApplication Dependent<\/td>\n<\/tr>\n
                      Portable Use<\/td>\n\u041e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u0439<\/td>\nBetter<\/strong><\/td>\n<\/tr>\n<\/table>\n

                      \nThe PCIe-8431\/2 is particularly suitable for permanently integrated industrial and automated test systems, while USB interfaces may be more convenient for temporary or portable connections.\n<\/p>\n

                      NI-Serial Driver<\/h3>\n

                      \nThe PCIe-8431\/2 operates with compatible NI-Serial<\/strong> driver software.\n<\/p>\n

                      \nThe driver provides the interface between the operating system, application software, and serial hardware.\n<\/p>\n

                      \nBefore integrating the device into an existing system, verify compatibility between:\n<\/p>\n

                        \n
                      • PCIe-8431\/2<\/li>\n
                      • NI-Serial version<\/li>\n
                      • Operating system<\/li>\n
                      • Development environment<\/li>\n
                      • Existing application software<\/li>\n<\/ul>\n

                        NI-VISA Integration<\/h3>\n

                        \nCompatible applications can use NI-VISA<\/strong> for serial instrument communication.\n<\/p>\n

                        \nA typical VISA workflow is:\n<\/p>\n

                        \nVISA Open \u2192 Configure Serial Port \u2192 VISA Write \u2192 VISA Read \u2192 VISA Close<\/strong>\n<\/p>\n

                        \nThis provides a familiar programming architecture for automated instrument-control applications.\n<\/p>\n

                        LabVIEW Integration<\/h3>\n

                        \nThe PCIe-8431\/2 can be integrated into compatible \u041b\u0430\u0431\u0412\u044c\u044e<\/strong> applications for serial communication and automation.\n<\/p>\n

                        \nTypical LabVIEW applications include:\n<\/p>\n

                          \n
                        • Industrial device control<\/li>\n
                        • Automated test<\/li>\n
                        • Instrument communication<\/li>\n
                        • Serial data logging<\/li>\n
                        • Production test<\/li>\n
                        • Laboratory automation<\/li>\n
                        • Device configuration<\/li>\n<\/ul>\n

                          Legacy Serial System Replacement<\/h3>\n

                          \nThe PCIe-8431\/2 can be used when upgrading an existing RS-485 or RS-422 test system to a computer with PCI Express expansion capability.\n<\/p>\n

                          \nBefore replacing another serial interface, verify:\n<\/p>\n

                            \n
                          • RS-485 or RS-422 requirement<\/li>\n
                          • Required number of ports<\/li>\n
                          • 2-wire or 4-wire wiring<\/li>\n
                          • Half-duplex or full-duplex operation<\/li>\n
                          • Baud rate<\/li>\n
                          • Connector and pinout<\/li>\n
                          • Termination requirements<\/li>\n
                          • Biasing requirements<\/li>\n
                          • Isolation requirements<\/li>\n
                          • PCI Express slot availability<\/li>\n
                          • NI-Serial compatibility<\/li>\n
                          • Operating system<\/li>\n
                          • Existing software application<\/li>\n<\/ul>\n

                            Troubleshooting RS-485\/RS-422 Communication<\/h3>\n

                            \nIf communication does not work correctly, check the complete serial communication path.\n<\/p>\n

                              \n
                            1. Verify that the PCIe-8431\/2 is detected by the computer.<\/li>\n
                            2. Confirm that the correct serial port is selected.<\/li>\n
                            3. Verify RS-485 or RS-422 mode.<\/li>\n
                            4. Check 2-wire or 4-wire configuration.<\/li>\n
                            5. Confirm baud rate.<\/li>\n
                            6. Verify data bits, parity, and stop bits.<\/li>\n
                            7. Check cable pinout and polarity.<\/li>\n
                            8. Verify termination.<\/li>\n
                            9. Check network biasing.<\/li>\n
                            10. Confirm the external device communication protocol.<\/li>\n
                            11. Reduce the baud rate temporarily when troubleshooting signal-integrity problems.<\/li>\n<\/ol>\n

                              How to Choose an RS-485\/RS-422 Interface<\/h3>\n

                              \nBefore selecting the PCIe-8431\/2, determine:\n<\/p>\n

                                \n
                              • RS-485 or RS-422 requirement<\/li>\n
                              • Number of required serial ports<\/li>\n
                              • Required maximum baud rate<\/li>\n
                              • 2-wire or 4-wire configuration<\/li>\n
                              • Half-duplex or full-duplex operation<\/li>\n
                              • Communication distance<\/li>\n
                              • Network topology<\/li>\n
                              • Termination requirements<\/li>\n
                              • Biasing requirements<\/li>\n
                              • Electrical isolation requirements<\/li>\n
                              • Available PCI Express slot<\/li>\n
                              • Driver compatibility<\/li>\n
                              • Application software compatibility<\/li>\n<\/ul>\n

                                Industries<\/h3>\n
                                  \n
                                • \u041f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0430\u044f \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0430\u0446\u0438\u044f<\/li>\n
                                • Automated Test<\/li>\n
                                • Electronic Manufacturing<\/li>\n
                                • Production Test<\/li>\n
                                • Process Control<\/li>\n
                                • Laboratory Automation<\/li>\n
                                • Machine Automation<\/li>\n
                                • Research and Development<\/li>\n
                                • Embedded Systems<\/li>\n
                                • \u0421\u0438\u0441\u0442\u0435\u043c\u043d\u0430\u044f \u0438\u043d\u0442\u0435\u0433\u0440\u0430\u0446\u0438\u044f<\/li>\n<\/ul>\n

                                  Applications<\/h3>\n

                                  \u041f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0430\u044f \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0430\u0446\u0438\u044f<\/h4>\n

                                  \nThe PCIe-8431\/2 provides RS-485 and RS-422 connectivity for industrial controllers, sensors, machines, and automation equipment.\n<\/p>\n

                                  Automated Test<\/h4>\n

                                  \nThe two serial interfaces can communicate with instruments, controllers, and DUTs as part of automated electronic test systems.\n<\/p>\n

                                  Instrument Control<\/h4>\n

                                  \nCompatible RS-485 and RS-422 instruments can be configured, controlled, monitored, and queried through the PCIe-8431\/2.\n<\/p>\n

                                  Production Test<\/h4>\n

                                  \nProduction test systems can use the PCIe-8431\/2 to communicate with serial DUTs, fixtures, and supporting test equipment.\n<\/p>\n

                                  Serial Data Logging<\/h4>\n

                                  \nThe device can receive and log serial data from compatible industrial or laboratory equipment.\n<\/p>\n

                                  Legacy Equipment Integration<\/h4>\n

                                  \nExisting RS-485 and RS-422 equipment can be retained when upgrading the host computer to a PCI Express-based platform.\n<\/p>\n

                                  Recommended Related Products<\/h3>\n\n\n\n\n\n\n
                                  PCIe-8431\/2<\/strong><\/td>\n2-port PCI Express RS-485\/RS-422 interface for industrial communication and automated test.<\/td>\n<\/tr>\n
                                  PCIe-8431\/4<\/strong><\/td>\n4-port RS-485\/RS-422 serial interface for systems requiring additional communication channels.<\/td>\n<\/tr>\n
                                  PCIe-8431\/8<\/strong><\/td>\n8-port PCI Express RS-485\/RS-422 interface for medium-density serial systems.<\/td>\n<\/tr>\n
                                  PCIe-8431\/16<\/strong><\/td>\n16-port PCI Express RS-485\/RS-422 interface for high-density industrial serial communication.<\/td>\n<\/tr>\n
                                  PCIe-8430\/2<\/strong><\/td>\n2-port PCI Express RS-232 interface for equipment requiring RS-232 instead of RS-485\/RS-422.<\/td>\n<\/tr>\n<\/table>\n

                                  Why Choose PCIe-8431\/2?<\/h3>\n
                                    \n
                                  • Two independent serial ports<\/li>\n
                                  • RS-485 support<\/li>\n
                                  • RS-422 support<\/li>\n
                                  • Up to 3 Mb\/s communication<\/li>\n
                                  • Differential signaling<\/li>\n
                                  • 2-wire RS-485 operation<\/li>\n
                                  • 4-wire communication<\/li>\n
                                  • Half-duplex support<\/li>\n
                                  • Full-duplex support<\/li>\n
                                  • PCI Express host interface<\/li>\n
                                  • NI-Serial software support<\/li>\n
                                  • NI-VISA integration<\/li>\n
                                  • LabVIEW compatibility<\/li>\n
                                  • Suitable for industrial automation<\/li>\n
                                  • Suitable for automated test<\/li>\n
                                  • Suitable for instrument control<\/li>\n
                                  • Suitable for production test<\/li>\n
                                  • Suitable for legacy serial equipment integration<\/li>\n<\/ul>\n

                                    Frequently Asked Questions<\/h3>\n

                                    What is the NI PCIe-8431\/2?<\/h4>\n

                                    \nThe NI PCIe-8431\/2 is a two-port PCI Express serial interface device designed for RS-485 and RS-422 communication in industrial, laboratory, and automated test applications.\n<\/p>\n

                                    How many serial ports does PCIe-8431\/2 have?<\/h4>\n

                                    \nThe PCIe-8431\/2 provides two independent serial communication ports<\/strong>.\n<\/p>\n

                                    Does PCIe-8431\/2 support RS-485?<\/h4>\n

                                    \nYes. The PCIe-8431\/2 supports RS-485 differential serial communication.\n<\/p>\n

                                    Does PCIe-8431\/2 support RS-422?<\/h4>\n

                                    \nYes. The PCIe-8431\/2 supports both RS-485 and RS-422<\/strong> communication.\n<\/p>\n

                                    What is the maximum baud rate of PCIe-8431\/2?<\/h4>\n

                                    \nThe PCIe-8431\/2 supports serial communication rates up to 3 Mb\/s<\/strong>, depending on the selected operating configuration.\n<\/p>\n

                                    Does PCIe-8431\/2 support 2-wire RS-485?<\/h4>\n

                                    \nYes. The PCIe-8431\/2 supports 2-wire RS-485 operation for compatible half-duplex serial networks.\n<\/p>\n

                                    Does PCIe-8431\/2 support 4-wire communication?<\/h4>\n

                                    \nYes. Four-wire operation can be used for compatible full-duplex RS-485 or RS-422 communication systems.\n<\/p>\n

                                    Is PCIe-8431\/2 isolated?<\/h4>\n

                                    \nThe PCIe-8431\/2 is a non-isolated<\/strong> RS-485\/RS-422 serial interface. Applications requiring electrical isolation should use an appropriate isolated serial interface.\n<\/p>\n

                                    What is the difference between PCIe-8431\/2 and PCIe-8430\/2?<\/h4>\n

                                    \nThe PCIe-8431\/2 is designed for RS-485\/RS-422<\/strong>, while the PCIe-8430\/2 is designed for \u0420\u0421-232<\/strong>. The correct model should be selected according to the electrical serial interface used by the external equipment.\n<\/p>\n

                                    What is the difference between PCIe-8431\/2 and PCIe-8431\/16?<\/h4>\n

                                    \nBoth devices support RS-485\/RS-422 communication, but the PCIe-8431\/2 provides two serial ports while the PCIe-8431\/16 provides sixteen. The two-port version is more appropriate when only a small number of independent serial connections are required.\n<\/p>\n

                                    Can PCIe-8431\/2 be used with LabVIEW?<\/h4>\n

                                    \nYes. The PCIe-8431\/2 can be integrated into compatible LabVIEW applications for industrial communication, automated test, serial data logging, and instrument control.\n<\/p>\n

                                    Can PCIe-8431\/2 be used with NI-VISA?<\/h4>\n

                                    \nYes. Compatible applications can use NI-VISA to communicate with serial instruments and other devices connected through the PCIe-8431\/2.\n<\/p>\n

                                    Can PCIe-8431\/2 communicate with Modbus devices?<\/h4>\n

                                    \nThe PCIe-8431\/2 provides the RS-485\/RS-422 physical serial interface required by many Modbus RTU systems. Modbus communication itself must be implemented by compatible application software or a Modbus library, and the connected device’s protocol and serial settings must match.\n<\/p>\n

                                    Can PCIe-8431\/2 communicate with two devices simultaneously?<\/h4>\n

                                    \nYes. Its two independent serial ports can communicate with separate compatible devices, subject to the software and communication architecture used by the application.\n<\/p>\n

                                    Why is my RS-485 device not communicating with PCIe-8431\/2?<\/h4>\n

                                    \nCheck the RS-485 wiring polarity, 2-wire or 4-wire mode, baud rate, data bits, parity, stop bits, termination, network biasing, device address, serial protocol, and communication cable.\n<\/p>\n

                                    What should I check before purchasing PCIe-8431\/2?<\/h4>\n

                                    \nVerify whether the equipment uses RS-485 or RS-422, the required number of ports, maximum baud rate, 2-wire or 4-wire architecture, half-duplex or full-duplex operation, connector and cable requirements, termination, biasing, isolation requirements, PCI Express slot, NI-Serial driver, operating system, NI-VISA, LabVIEW, and existing application compatibility.\n<\/p>\n

                                    \u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h3>\n

                                    \n\u0417\u0435\u043c\u043b\u044f NI PCIe-8431\/2 2-Port RS-485\/RS-422 Serial Interface Device<\/strong> provides two independent differential serial communication ports through a PCI Express host interface. With communication rates up to 3 Mb\/s and support for RS-485, RS-422, 2-wire, 4-wire, half-duplex, and full-duplex configurations, it is well suited for industrial automation, automated test, instrument control, production testing, serial data logging, and integration of existing RS-485\/RS-422 equipment.<\/p>","protected":false},"excerpt":{"rendered":"

                                    Supported Power Input: \u2014
                                    \nBus Connection: PCI Express
                                    \n\u0422\u0438\u043f \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u0438: \u041d\u0435\u0442
                                    \nNumber of Serial Channels: 2
                                    \nSupported Serial Protocols: RS485#RS422
                                    \nOperating Temperature Range: \u2014
                                    \nMaximum Baud Rate: \u2014
                                    \nFront Connection Type: D-SUB(2)
                                    \nNumber of Bidirectional Digital Channels: \u2014<\/p>","protected":false},"featured_media":33627,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[674],"product_tag":[],"class_list":["post-34619","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pci-usb","first","instock","shipping-taxable","purchasable","product-type-simple"],"acf":[],"yoast_head":"\nNI PCIe-8431\/2 PCIe Serial Interface Device 782124-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"NI PCIe-8431\/2 is a 2-port PCI Express RS-485\/RS-422 serial interface for industrial communication, instrument control, automation and serial data acquisition.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pxisource.com\/ru\/product\/pcie-8431-2\/\" \/>\n<meta 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