{"id":34623,"date":"2026-08-07T13:10:58","date_gmt":"2026-08-07T05:10:58","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&p=34623"},"modified":"2026-08-27T19:53:15","modified_gmt":"2026-08-27T11:53:15","slug":"pcie-8433-2","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pcie-8433-2\/","title":{"rendered":"PCIe-8433\/2"},"content":{"rendered":"

Product Introduction<\/h3>\n

\n\u0417\u0435\u043c\u043b\u044f NI PCIe-8433\/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 isolated RS-485\/RS-422 serial interface device<\/strong> designed for industrial automation, automated test, instrument control, production systems, laboratory automation, and communication with electrically distributed equipment.\n<\/p>\n

\nThe PCIe-8433\/2 combines two independent RS-485\/RS-422 serial ports<\/strong> \u0441 port-to-port electrical isolation<\/strong> and a PCI Express host interface. Its isolation architecture helps reduce problems caused by ground loops, ground-potential differences, and electrical noise between connected devices.\n<\/p>\n

\nThe device also supports 2-\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u043e\u0439 \u0438 4-\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u043e\u0439 \u0440\u0435\u0436\u0438\u043c\u044b \u043f\u0440\u0438\u0435\u043c\u043e\u043f\u0435\u0440\u0435\u0434\u0430\u0442\u0447\u0438\u043a\u0430<\/strong>, full-duplex and half-duplex communication, high-performance DMA transfers, multithreaded applications, and multiprocessor systems.\n<\/p>\n

Product Overview<\/h3>\n

\n\u0417\u0435\u043c\u043b\u044f National Instruments PCIe-8433\/2<\/strong> belongs to the NI isolated industrial serial interface family.\n<\/p>\n

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

\nHost Computer \u2192 PCI Express \u2192 PCIe-8433\/2 \u2192 Isolated RS-485 \/ RS-422 \u2192 Industrial Device \/ Instrument \/ Controller<\/strong>\n<\/p>\n

\nThe combination of differential serial communication and electrical isolation makes the PCIe-8433\/2 particularly suitable for test and industrial systems where external devices may use different ground references or operate in electrically noisy environments.\n<\/p>\n

Key Features<\/h3>\n

2 Isolated Serial Ports<\/h4>\n

\nThe PCIe-8433\/2 provides two isolated serial communication ports<\/strong>.\n<\/p>\n

\nEach port can communicate with compatible RS-485 or RS-422 equipment while providing isolation between the computer and serial ports as well as port-to-port isolation according to the device architecture.\n<\/p>\n

RS-485 Communication<\/h4>\n

\nThe PCIe-8433\/2 supports RS-485 differential serial communication<\/strong>.\n<\/p>\n

\nRS-485 is widely used in industrial systems because of its strong noise immunity and support for multi-device communication.\n<\/p>\n

\n\u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0442:\n<\/p>\n

    \n
  • Industrial controllers<\/li>\n
  • PLCs<\/li>\n
  • Motion systems<\/li>\n
  • Process equipment<\/li>\n
  • Distributed sensors<\/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
  • Machine-control equipment<\/li>\n<\/ul>\n

    RS-422 Communication<\/h4>\n

    \nThe PCIe-8433\/2 also supports RS-422<\/strong> communication for compatible industrial and instrumentation applications.\n<\/p>\n

    \nRS-422 uses differential signaling and is suitable for reliable communication over longer distances and in electrically noisy environments.\n<\/p>\n

    Port-to-Port Isolation<\/h4>\n

    \nA key feature of the PCIe-8433\/2 is port-to-port isolation<\/strong>.\n<\/p>\n

    \nIsolation helps reduce communication and equipment problems caused by:\n<\/p>\n

      \n
    • Ground loops<\/li>\n
    • Ground-potential differences<\/li>\n
    • Common-mode electrical noise<\/li>\n
    • Industrial switching transients<\/li>\n
    • Distributed power systems<\/li>\n
    • Different equipment ground references<\/li>\n<\/ul>\n

      \nThis makes the PCIe-8433\/2 more appropriate than a non-isolated serial board for many industrial installations.\n<\/p>\n

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

      \nThe PCIe-8433\/2 supports 2-wire RS-485<\/strong> operation.\n<\/p>\n

      \nIn a typical 2-wire architecture, the same differential pair is used for transmitting and receiving, resulting in half-duplex communication.\n<\/p>\n

      4-Wire Communication<\/h4>\n

      \nThe interface also supports 4-wire transceiver mode<\/strong>.\n<\/p>\n

      \nFour-wire configurations use separate transmit and receive differential pairs and can provide full-duplex communication with compatible equipment.\n<\/p>\n

      Half-Duplex Communication<\/h4>\n

      \nHalf-duplex mode is commonly used for 2-wire RS-485 networks where connected devices share one communication pair.\n<\/p>\n

      Full-Duplex Communication<\/h4>\n

      \nThe PCIe-8433\/2 supports full-duplex communication when configured with an appropriate 4-wire RS-485 or RS-422 connection.\n<\/p>\n

      High-Performance DMA Transfers<\/h4>\n

      \nThe PCIe-8433\/2 supports Direct Memory Access (DMA)<\/strong> for efficient transfer of serial data between the interface hardware and host computer.\n<\/p>\n

      \nDMA can reduce CPU overhead and improve performance in applications that continuously transmit and receive serial data.\n<\/p>\n

      Multithreading Support<\/h4>\n

      \nThe device supports multithreaded applications<\/strong>, allowing separate software tasks to manage different communication operations simultaneously.\n<\/p>\n

      Multiprocessor Support<\/h4>\n

      \nThe PCIe-8433\/2 also supports multiprocessor host systems<\/strong>, which can be useful in complex automated test and industrial applications.\n<\/p>\n

      Standard COM Port Compatibility<\/h4>\n

      \nNI serial interfaces appear as standard COM ports<\/strong> to compatible software.\n<\/p>\n

      \nThis allows many existing serial applications to use the PCIe-8433\/2 without requiring a completely proprietary communication architecture.\n<\/p>\n

      PCI Express Host Interface<\/h4>\n

      \nThe PCIe-8433\/2 installs into a compatible PCI Express<\/strong> slot in a desktop, workstation, industrial, or rackmount computer.\n<\/p>\n

      \nThe PCI Express interface is well suited for permanently installed industrial and automated test systems.\n<\/p>\n

      Technical Specifications<\/h3>\n\n\n\n\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>\nIsolated Serial Interface Device<\/td>\n<\/tr>\n
      \u041c\u043e\u0434\u0435\u043b\u044c<\/td>\nPCIe-8433\/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
      Part Number<\/td>\n781745-01<\/td>\n<\/tr>\n
      Host Interface<\/td>\nPCI Express<\/td>\n<\/tr>\n
      Serial Protocols<\/td>\nRS-485 \/ RS-422<\/td>\n<\/tr>\n
      Number of Serial Ports<\/td>\n2<\/td>\n<\/tr>\n
      Isolation Type<\/td>\nPort-to-Port Isolation<\/td>\n<\/tr>\n
      2-Wire Mode<\/td>\nSupported<\/td>\n<\/tr>\n
      4-Wire Mode<\/td>\nSupported<\/td>\n<\/tr>\n
      Half-Duplex<\/td>\nSupported<\/td>\n<\/tr>\n
      Full-Duplex<\/td>\nSupported<\/td>\n<\/tr>\n
      DMA<\/td>\nSupported<\/td>\n<\/tr>\n
      Multithreading<\/td>\nSupported<\/td>\n<\/tr>\n
      Multiprocessor Support<\/td>\nSupported<\/td>\n<\/tr>\n
      Software Interface<\/td>\nStandard COM Port \/ NI Serial Software<\/td>\n<\/tr>\n
      Primary Applications<\/td>\nIndustrial Communication, Automated Test, Instrument Control and Isolated Serial Communication<\/td>\n<\/tr>\n<\/table>\n

      How Does the PCIe-8433\/2 Work?<\/h3>\n

      \nThe PCIe-8433\/2 provides an electrically isolated communication interface between application software running on the host computer and external RS-485 or RS-422 equipment.\n<\/p>\n

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

      \nApplication \u2192 Serial Driver \u2192 PCIe-8433\/2 \u2192 Isolation \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 Isolation \u2192 PCIe-8433\/2 \u2192 Serial Driver \u2192 Application<\/strong>\n<\/p>\n

      \nThis architecture allows the host system to communicate with industrial equipment while reducing direct electrical coupling between connected systems.\n<\/p>\n

      What Is an Isolated Serial Interface?<\/h3>\n

      \nAn isolated serial interface<\/strong> uses electrical isolation barriers between sections of the communication system.\n<\/p>\n

      \nThe isolation helps prevent direct current paths between equipment grounds.\n<\/p>\n

      \nThis is particularly important when:\n<\/p>\n

        \n
      • Connected equipment uses different power supplies<\/li>\n
      • Long cables create ground-potential differences<\/li>\n
      • Industrial motors and drives generate electrical noise<\/li>\n
      • Ground loops affect communication reliability<\/li>\n
      • Additional protection between systems is desirable<\/li>\n<\/ul>\n

        Why Is Port-to-Port Isolation Important?<\/h3>\n

        \nPort-to-port isolation allows separate serial interfaces to communicate with equipment that may not share the same ground reference.\n<\/p>\n

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

        \nPort 1 \u2192 Machine A Ground Domain<\/strong>
        \nPort 2 \u2192 Machine B Ground Domain<\/strong>\n<\/p>\n

        \nThis can be beneficial when the two external devices are installed in different parts of a factory or use different power systems.\n<\/p>\n

        RS-485 Communication<\/h3>\n

        \nRS-485 is a differential serial standard commonly used for industrial communication.\n<\/p>\n

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

          \n
        • Differential signaling<\/li>\n
        • Good noise immunity<\/li>\n
        • Longer practical communication distance<\/li>\n
        • Support for multidrop network architectures<\/li>\n
        • Wide industrial adoption<\/li>\n<\/ul>\n

          RS-422 Communication<\/h3>\n

          \nRS-422 also uses differential signaling and is commonly used for point-to-point or limited multidrop communication.\n<\/p>\n

          \nIt is often selected when reliable full-duplex serial communication is required over longer cable distances.\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 Network<\/td>\nStrong<\/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
          Half-Duplex<\/td>\nCommon<\/strong><\/td>\nLess Common<\/td>\n<\/tr>\n
          Full-Duplex<\/td>\nSupported<\/td>\nCommon<\/strong><\/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

          \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 isolated architecture makes the PCIe-8433\/2 particularly suitable for industrial automation.\n<\/p>\n

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

            \n
          • PLCs<\/li>\n
          • Industrial controllers<\/li>\n
          • Motor controllers<\/li>\n
          • Distributed sensors<\/li>\n
          • Process equipment<\/li>\n
          • Machine-control systems<\/li>\n
          • Production equipment<\/li>\n<\/ul>\n

            Automated Test Applications<\/h3>\n

            \nThe PCIe-8433\/2 can integrate isolated RS-485 or RS-422 communication into automated test platforms.\n<\/p>\n

            \nA complete test system can combine:\n<\/p>\n

              \n
            • PCIe-8433\/2 serial communication<\/li>\n
            • DAQ hardware<\/li>\n
            • Oscilloscopes or digitizers<\/li>\n
            • Programmable power supplies<\/li>\n
            • Electronic loads<\/li>\n
            • \u0426\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u0432\u0432\u043e\u0434-\u0432\u044b\u0432\u043e\u0434<\/li>\n
            • Switch systems<\/li>\n
            • Test fixtures<\/li>\n<\/ul>\n

              \nTest software can coordinate serial commands with electrical measurements and DUT stimulus.\n<\/p>\n

              Instrument Control<\/h3>\n

              \nCompatible instruments using RS-485 or RS-422 can be controlled through the PCIe-8433\/2.\n<\/p>\n

              \nTypical operations include:\n<\/p>\n

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

                Distributed Equipment Communication<\/h3>\n

                \nIsolation can be particularly valuable when the connected devices are physically separated.\n<\/p>\n

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

                \nIndustrial PC \u2192 PCIe-8433\/2 Port 1 \u2192 Equipment Area A<\/strong>
                \nIndustrial PC \u2192 PCIe-8433\/2 Port 2 \u2192 Equipment Area B<\/strong>\n<\/p>\n

                \nPort-to-port isolation reduces direct ground coupling between the two external serial systems.\n<\/p>\n

                Production Test<\/h3>\n

                \nThe PCIe-8433\/2 can communicate with DUTs, fixtures, industrial controllers, and supporting equipment during automated production testing.\n<\/p>\n

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

                  \n
                1. Open the required serial port.<\/li>\n
                2. Configure RS-485 or RS-422 mode.<\/li>\n
                3. Set the baud rate and serial parameters.<\/li>\n
                4. Send commands to the DUT.<\/li>\n
                5. Receive serial response data.<\/li>\n
                6. Perform electrical measurements.<\/li>\n
                7. Analyze the results.<\/li>\n
                8. Store pass\/fail data.<\/li>\n<\/ol>\n

                  Modbus RTU Applications<\/h3>\n

                  \nMany Modbus RTU<\/strong> systems use RS-485 as their physical communication interface.\n<\/p>\n

                  \nThe PCIe-8433\/2 can provide the isolated RS-485 hardware layer for compatible Modbus RTU systems.\n<\/p>\n

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

                  \nModbus Software \u2192 PCIe-8433\/2 \u2192 Isolated RS-485 \u2192 Modbus Devices<\/strong>\n<\/p>\n

                  \nThe Modbus protocol itself must be implemented using compatible application software or a Modbus library.\n<\/p>\n

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

                  \nProper termination is important for reliable RS-485 communication.\n<\/p>\n

                  \nThe complete network should be evaluated for:\n<\/p>\n

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

                    RS-485 Biasing<\/h3>\n

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

                    \nBiasing requirements should be determined according to the connected transceivers, topology, cable, termination, and device documentation.\n<\/p>\n

                    Isolation vs Non-Isolated Serial Interface<\/h3>\n\n\n\n\n\n\n\n\n
                    \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nPCIe-8433\/2<\/th>\nNon-Isolated RS-485 Interface<\/th>\n<\/tr>\n
                    RS-485 \/ RS-422<\/td>\n\u0414\u0430<\/td>\n\u0414\u0430<\/td>\n<\/tr>\n
                    Electrical Isolation<\/td>\n\u0414\u0430<\/strong><\/td>\nNo<\/td>\n<\/tr>\n
                    Port-to-Port Isolation<\/td>\n\u0414\u0430<\/strong><\/td>\nNo<\/td>\n<\/tr>\n
                    Ground Loop Protection<\/td>\nBetter<\/strong><\/td>\nMore Limited<\/td>\n<\/tr>\n
                    Distributed Equipment<\/td>\nWell Suited<\/strong><\/td>\nSystem Dependent<\/td>\n<\/tr>\n
                    Industrial Noise Environment<\/td>\nPreferred When Isolation Is Required<\/strong><\/td>\nSuitable When Grounds Are Controlled<\/td>\n<\/tr>\n<\/table>\n

                    PCIe-8433\/2 vs PCIe-8431\/2<\/h3>\n

                    \nThe PCIe-8433\/2 and PCIe-8431\/2 both support two-port RS-485\/RS-422 communication, but isolation is the major difference.\n<\/p>\n\n\n\n\n\n\n\n\n
                    \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nPCIe-8433\/2<\/th>\nPCIe-8431\/2<\/th>\n<\/tr>\n
                    Serial Standard<\/td>\nRS-485 \/ RS-422<\/td>\nRS-485 \/ RS-422<\/td>\n<\/tr>\n
                    Serial Ports<\/td>\n2<\/td>\n2<\/td>\n<\/tr>\n
                    \u0418\u0437\u043e\u043b\u044f\u0446\u0438\u044f<\/td>\nPort-to-Port Isolated<\/strong><\/td>\nNon-Isolated<\/td>\n<\/tr>\n
                    2-Wire \/ 4-Wire<\/td>\n\u0414\u0430<\/td>\n\u0414\u0430<\/td>\n<\/tr>\n
                    Primary Advantage<\/td>\nElectrical Isolation<\/strong><\/td>\nStandard Serial Communication<\/td>\n<\/tr>\n
                    Best Application<\/td>\nDistributed \/ Noisy Industrial Systems<\/td>\nControlled-Ground Systems<\/td>\n<\/tr>\n<\/table>\n

                    \nIf ground-potential differences or electrical isolation are important, the PCIe-8433\/2 is generally more appropriate than the non-isolated PCIe-8431\/2.\n<\/p>\n

                    PCIe-8433\/2 vs PCIe-8432\/2<\/h3>\n

                    \nBoth models provide isolated serial communication but support different serial electrical standards.\n<\/p>\n\n\n\n\n\n\n\n
                    \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nPCIe-8433\/2<\/th>\nPCIe-8432\/2<\/th>\n<\/tr>\n
                    Serial Standard<\/td>\nRS-485 \/ RS-422<\/strong><\/td>\n\u0420\u0421-232<\/td>\n<\/tr>\n
                    Ports<\/td>\n2<\/td>\n2<\/td>\n<\/tr>\n
                    \u0418\u0437\u043e\u043b\u044f\u0446\u0438\u044f<\/td>\n\u0414\u0430<\/td>\n\u0414\u0430<\/td>\n<\/tr>\n
                    Signaling<\/td>\nDifferential<\/strong><\/td>\nSingle-Ended<\/td>\n<\/tr>\n
                    \u0422\u0438\u043f\u0438\u0447\u043d\u043e\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435<\/td>\nIndustrial Networks<\/td>\nIsolated RS-232 Instrument Control<\/td>\n<\/tr>\n<\/table>\n

                    PCIe-8433\/2 vs PCI-8433\/2<\/h3>\n

                    \nThe PCIe-8433\/2 is the PCI Express version of this isolated serial interface family, while the older PCI-8433\/2 uses a conventional PCI host bus.\n<\/p>\n\n\n\n\n\n\n\n
                    \u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nPCIe-8433\/2<\/th>\nPCI-8433\/2<\/th>\n<\/tr>\n
                    Host Interface<\/td>\nPCI Express<\/strong><\/td>\nPCI<\/td>\n<\/tr>\n
                    Serial Standard<\/td>\nRS-485 \/ RS-422<\/td>\nRS-485 \/ RS-422<\/td>\n<\/tr>\n
                    Ports<\/td>\n2<\/td>\n2<\/td>\n<\/tr>\n
                    \u0418\u0437\u043e\u043b\u044f\u0446\u0438\u044f<\/td>\n\u0414\u0430<\/td>\n\u0414\u0430<\/td>\n<\/tr>\n
                    Typical System<\/td>\nNewer PCI Express Computers<\/td>\nLegacy PCI Computers<\/td>\n<\/tr>\n<\/table>\n

                    NI Serial Software Integration<\/h3>\n

                    \nThe PCIe-8433\/2 operates with compatible NI serial software.\n<\/p>\n

                    \nApplications can perform functions such as:\n<\/p>\n

                      \n
                    • Open serial ports<\/li>\n
                    • Configure baud rate<\/li>\n
                    • Select RS-485 \/ RS-422 mode<\/li>\n
                    • Configure 2-wire \/ 4-wire operation<\/li>\n
                    • Transmit serial commands<\/li>\n
                    • Receive serial data<\/li>\n
                    • Monitor communication status<\/li>\n
                    • Log data<\/li>\n<\/ul>\n

                      NI-VISA Integration<\/h3>\n

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

                      \nA common workflow is:\n<\/p>\n

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

                      LabVIEW Integration<\/h3>\n

                      \nThe PCIe-8433\/2 can be incorporated into compatible \u041b\u0430\u0431\u0412\u044c\u044e<\/strong> applications for serial communication and automation.\n<\/p>\n

                      \n\u041e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0442:\n<\/p>\n

                        \n
                      • Industrial equipment control<\/li>\n
                      • Automated testing<\/li>\n
                      • Instrument communication<\/li>\n
                      • Production testing<\/li>\n
                      • Serial data logging<\/li>\n
                      • Machine monitoring<\/li>\n
                      • Laboratory automation<\/li>\n<\/ul>\n

                        Legacy System Replacement<\/h3>\n

                        \nWhen replacing an existing PCIe-8433\/2, verify more than the RS-485\/RS-422 protocol.\n<\/p>\n

                        \nImportant compatibility factors include:\n<\/p>\n

                          \n
                        • Exact PCIe-8433\/2 model<\/li>\n
                        • Part number 781745-01<\/li>\n
                        • Required number of ports<\/li>\n
                        • Isolation requirements<\/li>\n
                        • 2-wire or 4-wire configuration<\/li>\n
                        • Half-duplex or full-duplex operation<\/li>\n
                        • Baud rate<\/li>\n
                        • Connector and cable configuration<\/li>\n
                        • Termination<\/li>\n
                        • Biasing<\/li>\n
                        • PCI Express slot<\/li>\n
                        • NI Serial driver compatibility<\/li>\n
                        • NI-VISA compatibility<\/li>\n
                        • Operating system<\/li>\n
                        • Existing application software<\/li>\n<\/ul>\n

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

                          \nIf communication is unavailable or unstable, check the complete serial link.\n<\/p>\n

                            \n
                          1. Verify that the PCIe-8433\/2 is detected by the host computer.<\/li>\n
                          2. Confirm the correct COM port.<\/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, data bits, parity, and stop bits.<\/li>\n
                          6. Check cable wiring and differential polarity.<\/li>\n
                          7. Verify network termination.<\/li>\n
                          8. Check RS-485 biasing.<\/li>\n
                          9. Confirm external device address and protocol.<\/li>\n
                          10. Check whether ground-potential differences or wiring issues are present.<\/li>\n
                          11. Reduce baud rate temporarily to diagnose signal-integrity problems.<\/li>\n<\/ol>\n

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

                            \nBefore selecting the PCIe-8433\/2, determine:\n<\/p>\n

                              \n
                            • RS-485 or RS-422 requirement<\/li>\n
                            • Required number of ports<\/li>\n
                            • Need for electrical isolation<\/li>\n
                            • Need for port-to-port isolation<\/li>\n
                            • 2-wire or 4-wire architecture<\/li>\n
                            • Half-duplex or full-duplex operation<\/li>\n
                            • Required baud rate<\/li>\n
                            • Communication distance<\/li>\n
                            • Network topology<\/li>\n
                            • Termination requirements<\/li>\n
                            • Biasing requirements<\/li>\n
                            • Available PCI Express slot<\/li>\n
                            • Operating system compatibility<\/li>\n
                            • Driver and application 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
                              • Machine Automation<\/li>\n
                              • Laboratory Automation<\/li>\n
                              • Research and Development<\/li>\n
                              • \u042d\u043d\u0435\u0440\u0433\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b<\/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-8433\/2 provides isolated RS-485\/RS-422 communication for industrial controllers, sensors, machines, and automation equipment.\n<\/p>\n

                                Automated Test<\/h4>\n

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

                                Instrument Control<\/h4>\n

                                \nCompatible RS-485 and RS-422 instruments can be configured, controlled, and monitored while maintaining electrical isolation from the host computer.\n<\/p>\n

                                Production Test<\/h4>\n

                                \nThe PCIe-8433\/2 can communicate with serial DUTs, fixtures, and production equipment in environments where isolation improves system robustness.\n<\/p>\n

                                Modbus RTU<\/h4>\n

                                \nThe PCIe-8433\/2 can provide an isolated RS-485 physical interface for compatible Modbus RTU systems when used with appropriate protocol software.\n<\/p>\n

                                Distributed Equipment Communication<\/h4>\n

                                \nPort-to-port isolation makes the device particularly useful when communicating with equipment located in different electrical ground domains.\n<\/p>\n

                                Recommended Related Products<\/h3>\n\n\n\n\n\n\n
                                PCIe-8433\/2<\/strong><\/td>\n2-port isolated PCI Express RS-485\/RS-422 interface for industrial communication and automated test.<\/td>\n<\/tr>\n
                                PCIe-8431\/2<\/strong><\/td>\n2-port non-isolated PCI Express RS-485\/RS-422 interface for controlled-ground systems.<\/td>\n<\/tr>\n
                                PCIe-8432\/2<\/strong><\/td>\n2-port isolated PCI Express RS-232 interface for isolated RS-232 instrument communication.<\/td>\n<\/tr>\n
                                PCI-8433\/2<\/strong><\/td>\nLegacy PCI version for isolated RS-485\/RS-422 communication.<\/td>\n<\/tr>\n
                                PXI-8433\/2<\/strong><\/td>\nPXI version for isolated RS-485\/RS-422 communication in modular test systems.<\/td>\n<\/tr>\n<\/table>\n

                                Why Choose PCIe-8433\/2?<\/h3>\n
                                  \n
                                • 2 isolated serial ports<\/li>\n
                                • RS-485 support<\/li>\n
                                • RS-422 support<\/li>\n
                                • Port-to-port isolation<\/li>\n
                                • 2-wire transceiver mode<\/li>\n
                                • 4-wire transceiver mode<\/li>\n
                                • Half-duplex communication<\/li>\n
                                • Full-duplex communication<\/li>\n
                                • High-performance DMA transfers<\/li>\n
                                • Multithreading support<\/li>\n
                                • Multiprocessor support<\/li>\n
                                • Standard COM port compatibility<\/li>\n
                                • PCI Express host interface<\/li>\n
                                • Suitable for industrial automation<\/li>\n
                                • Suitable for distributed equipment<\/li>\n
                                • Suitable for automated test<\/li>\n
                                • Suitable for instrument control<\/li>\n
                                • Suitable for Modbus RTU systems<\/li>\n<\/ul>\n

                                  Frequently Asked Questions<\/h3>\n

                                  What is the NI PCIe-8433\/2?<\/h4>\n

                                  \nThe NI PCIe-8433\/2 is a two-port isolated PCI Express serial interface device designed for RS-485 and RS-422 industrial communication.\n<\/p>\n

                                  What is the part number of PCIe-8433\/2?<\/h4>\n

                                  \nThe PCIe-8433\/2 is available under part number 781745-01<\/strong>.\n<\/p>\n

                                  How many serial ports does PCIe-8433\/2 have?<\/h4>\n

                                  \nThe PCIe-8433\/2 provides 2 serial communication ports<\/strong>.\n<\/p>\n

                                  Does PCIe-8433\/2 support RS-485?<\/h4>\n

                                  \nYes. The PCIe-8433\/2 supports RS-485 differential serial communication.\n<\/p>\n

                                  Does PCIe-8433\/2 support RS-422?<\/h4>\n

                                  \nYes. The device supports both RS-485 and RS-422<\/strong>.\n<\/p>\n

                                  Is PCIe-8433\/2 isolated?<\/h4>\n

                                  \nYes. NI specifies port-to-port isolation<\/strong> for the PCIe-8433\/2.\n<\/p>\n

                                  Does PCIe-8433\/2 support 2-wire RS-485?<\/h4>\n

                                  \nYes. The device supports selectable 2-wire transceiver operation for compatible half-duplex RS-485 systems.\n<\/p>\n

                                  Does PCIe-8433\/2 support 4-wire communication?<\/h4>\n

                                  \nYes. Four-wire mode is available for compatible full-duplex RS-485 or RS-422 communication.\n<\/p>\n

                                  Does PCIe-8433\/2 support DMA?<\/h4>\n

                                  \nYes. The device supports high-performance DMA transfers for efficient serial data movement between the hardware and host computer.\n<\/p>\n

                                  Does PCIe-8433\/2 appear as a COM port?<\/h4>\n

                                  \nYes. NI serial interfaces appear as standard COM ports to compatible serial communication applications.\n<\/p>\n

                                  What is the difference between PCIe-8433\/2 and PCIe-8431\/2?<\/h4>\n

                                  \nBoth provide two RS-485\/RS-422 ports, but PCIe-8433\/2 is isolated while PCIe-8431\/2 is non-isolated<\/strong>. This is the most important difference when selecting between the two models.\n<\/p>\n

                                  What is the difference between PCIe-8433\/2 and PCIe-8432\/2?<\/h4>\n

                                  \nBoth are isolated two-port PCI Express serial interfaces, but PCIe-8433\/2 supports RS-485\/RS-422<\/strong>, while PCIe-8432\/2 supports \u0420\u0421-232<\/strong>.\n<\/p>\n

                                  Can PCIe-8433\/2 be used for Modbus RTU?<\/h4>\n

                                  \nYes. It can provide the isolated RS-485 physical interface used by many Modbus RTU systems. The Modbus protocol itself must be handled by compatible software.\n<\/p>\n

                                  Can PCIe-8433\/2 be used with LabVIEW?<\/h4>\n

                                  \nYes. The PCIe-8433\/2 can be integrated into compatible LabVIEW applications for serial communication, automated testing, industrial control, and data logging.\n<\/p>\n

                                  Can PCIe-8433\/2 be used with NI-VISA?<\/h4>\n

                                  \nYes. Compatible NI-VISA applications can communicate with instruments and other serial devices through the PCIe-8433\/2.\n<\/p>\n

                                  When should I choose PCIe-8433\/2 instead of PCIe-8431\/2?<\/h4>\n

                                  \nChoose PCIe-8433\/2 when your application requires electrical isolation, particularly in systems with different ground references, long cable runs, industrial electrical noise, or distributed equipment.\n<\/p>\n

                                  What should I check before purchasing PCIe-8433\/2?<\/h4>\n

                                  \nVerify the RS-485\/RS-422 requirement, two-port configuration, need for port-to-port isolation, 2-wire or 4-wire wiring, half-duplex or full-duplex mode, baud rate, network termination, biasing, cable configuration, PCI Express slot, NI serial driver, NI-VISA, operating system, and application software compatibility.\n<\/p>\n

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

                                  \n\u0417\u0435\u043c\u043b\u044f NI PCIe-8433\/2 Isolated RS-485\/RS-422 Serial Interface Device<\/strong> combines two serial ports, port-to-port electrical isolation, selectable 2-wire and 4-wire operation, half- and full-duplex communication, high-performance DMA, multithreading, multiprocessor support, standard COM port compatibility, and PCI Express connectivity. These capabilities make it particularly suitable for industrial automation, distributed equipment communication, automated test, instrument control, production systems, Modbus RTU networks, and applications where electrical isolation is required.<\/p>","protected":false},"excerpt":{"rendered":"

                                  Supported Power Input: \u2014
                                  \nBus Connection: PCI Express
                                  \nIsolation Type: Port-Port Isolation
                                  \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":33630,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[674],"product_tag":[],"class_list":["post-34623","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-8433\/2 PCIe Serial Interface Device 781745-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"NI PCIe-8433\/2 is a 2-port isolated PCI Express RS-485\/RS-422 serial interface with DMA, 2-wire\/4-wire modes and standard COM port compatibility.\" \/>\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-8433-2\/\" \/>\n<meta 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