{"id":34621,"date":"2026-08-07T13:10:25","date_gmt":"2026-08-07T05:10:25","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=34621"},"modified":"2026-08-27T19:50:53","modified_gmt":"2026-08-27T11:50:53","slug":"pcie-8431-8","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pcie-8431-8\/","title":{"rendered":"PCIe-8431\/8"},"content":{"rendered":"<h3>Product Introduction<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>NI PCIe-8431\/8<\/strong> \u0432\u044b\u0441\u043e\u043a\u043e\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 <strong>8-port RS-485\/RS-422 serial interface device<\/strong> designed for industrial communication, automated test, instrument control, production systems, laboratory automation, and multi-device serial communication.\n<\/p>\n<p>\nThe PCIe-8431\/8 combines <strong>eight independent serial ports<\/strong> with a PCI Express host interface and supports communication rates up to <strong>3 Mb\/s<\/strong>. It is designed for systems that require reliable differential serial communication with multiple RS-485 or RS-422 devices from a single computer.\n<\/p>\n<p>\nWith support for RS-485 and RS-422 communication, the PCIe-8431\/8 is well suited for industrial environments where noise immunity, flexible network topology, and multi-device connectivity are important.\n<\/p>\n<h3>Product Overview<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>National Instruments PCIe-8431\/8<\/strong> provides eight serial communication channels for connecting a PCI Express host computer to compatible RS-485 and RS-422 equipment.\n<\/p>\n<p>\nA typical system architecture is:\n<\/p>\n<p>\n<strong>Host Computer \u2192 PCI Express \u2192 PCIe-8431\/8 \u2192 RS-485 \/ RS-422 \u2192 Instruments \/ Controllers \/ DUTs<\/strong>\n<\/p>\n<p>\nThe eight-port architecture provides a practical balance between low-port-count interfaces and high-density 16-port serial devices, making the PCIe-8431\/8 suitable for medium-sized industrial and automated test systems.\n<\/p>\n<h3>Key Features<\/h3>\n<h4>8 RS-485\/RS-422 Serial Ports<\/h4>\n<p>\nThe PCIe-8431\/8 provides <strong>eight serial communication ports<\/strong> for connecting multiple compatible devices.\n<\/p>\n<p>\nTypical connected equipment can include:\n<\/p>\n<ul>\n<li>Industrial controllers<\/li>\n<li>PLCs<\/li>\n<li>Test instruments<\/li>\n<li>Embedded controllers<\/li>\n<li>Motion-control equipment<\/li>\n<li>Industrial sensors<\/li>\n<li>Production equipment<\/li>\n<li>Machine-control systems<\/li>\n<\/ul>\n<h4>RS-485 Communication<\/h4>\n<p>\nThe PCIe-8431\/8 supports <strong>RS-485 differential serial communication<\/strong>.\n<\/p>\n<p>\nRS-485 is widely used in industrial systems because it provides good noise immunity and supports communication architectures involving multiple devices.\n<\/p>\n<p>\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<ul>\n<li>\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<li>\u0423\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043c\u0430\u0448\u0438\u043d\u043e\u0439<\/li>\n<li>Process control<\/li>\n<li>Distributed instrumentation<\/li>\n<li>Production equipment<\/li>\n<li>Automated testing<\/li>\n<li>Building automation<\/li>\n<\/ul>\n<h4>RS-422 Communication<\/h4>\n<p>\nThe PCIe-8431\/8 also supports <strong>RS-422<\/strong> communication for compatible industrial, laboratory, and test equipment.\n<\/p>\n<p>\nRS-422 uses differential signaling and is commonly selected for reliable serial communication where conventional single-ended RS-232 interfaces may not provide sufficient noise immunity or communication distance.\n<\/p>\n<h4>Up to 3 Mb\/s Serial Communication<\/h4>\n<p>\nThe PCIe-8431\/8 supports serial communication rates up to <strong>3 Mb\/s<\/strong>.\n<\/p>\n<p>\nThis high maximum data rate makes the interface suitable for applications requiring greater serial throughput than conventional low-speed industrial serial connections.\n<\/p>\n<h4>2-Wire RS-485 Support<\/h4>\n<p>\nThe PCIe-8431\/8 can support <strong>2-wire RS-485<\/strong> configurations.\n<\/p>\n<p>\nIn a typical 2-wire system, transmitting and receiving share the same differential pair, resulting in half-duplex communication.\n<\/p>\n<h4>4-Wire Communication<\/h4>\n<p>\nThe device can also support <strong>4-wire serial configurations<\/strong> using separate differential pairs for transmit and receive signals.\n<\/p>\n<p>\nFour-wire architectures can provide full-duplex communication when supported by the connected equipment.\n<\/p>\n<h4>Half-Duplex and Full-Duplex Operation<\/h4>\n<p>\nDepending on the selected wiring and external device configuration, the PCIe-8431\/8 can be integrated into both half-duplex and full-duplex serial communication systems.\n<\/p>\n<p>\nThis flexibility allows one serial interface family to support a wide range of industrial equipment and communication architectures.\n<\/p>\n<h4>Differential Signaling<\/h4>\n<p>\nRS-485 and RS-422 use differential signaling, which provides improved resistance to common-mode electrical noise compared with conventional single-ended RS-232 communication.\n<\/p>\n<p>\nThis characteristic makes the PCIe-8431\/8 particularly useful in electrically noisy industrial and production environments.\n<\/p>\n<h4>PCI Express Host Interface<\/h4>\n<p>\nThe PCIe-8431\/8 installs into a compatible <strong>PCI Express expansion slot<\/strong>.\n<\/p>\n<p>\nA typical configuration is:\n<\/p>\n<p>\n<strong>Industrial PC \u2192 PCIe-8431\/8 \u2192 Serial Network \u2192 Industrial Equipment<\/strong>\n<\/p>\n<p>\nThe internal PCI Express architecture is suitable for permanently integrated automated test stations, industrial computers, workstations, and rackmount systems.\n<\/p>\n<h4>High-Density Serial Connectivity<\/h4>\n<p>\nEight serial ports from one PCI Express interface can reduce the number of separate serial cards or external adapters required in a system.\n<\/p>\n<p>\nThis can simplify system integration, cabling, software configuration, and maintenance.\n<\/p>\n<h4>Multi-Port Communication<\/h4>\n<p>\nThe PCIe-8431\/8 is designed for systems where several serial devices need to communicate with the host computer independently.\n<\/p>\n<p>\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:\n<\/p>\n<p>\n<strong>Port 1 \u2192 PLC<\/strong><br \/>\n<strong>Port 2 \u2192 Motion Controller<\/strong><br \/>\n<strong>Port 3 \u2192 Test Instrument<\/strong><br \/>\n<strong>Port 4 \u2192 Sensor Controller<\/strong><br \/>\n<strong>Ports 5\u20138 \u2192 Additional Serial Devices<\/strong>\n<\/p>\n<h3>Technical Specifications<\/h3>\n<table>\n<tr>\n<th>\u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440<\/th>\n<th>\u0421\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f<\/th>\n<\/tr>\n<tr>\n<td width=\"280\">Product Type<\/td>\n<td>Serial Interface Device<\/td>\n<\/tr>\n<tr>\n<td>\u041c\u043e\u0434\u0435\u043b\u044c<\/td>\n<td>PCIe-8431\/8<\/td>\n<\/tr>\n<tr>\n<td>Manufacturer<\/td>\n<td>\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<tr>\n<td>Host Interface<\/td>\n<td>PCI Express<\/td>\n<\/tr>\n<tr>\n<td>Serial Interface<\/td>\n<td>RS-485 \/ RS-422<\/td>\n<\/tr>\n<tr>\n<td>Number of Serial Ports<\/td>\n<td>8<\/td>\n<\/tr>\n<tr>\n<td>Maximum Baud Rate<\/td>\n<td>Up to 3 Mb\/s<\/td>\n<\/tr>\n<tr>\n<td>Communication Modes<\/td>\n<td>Half-Duplex \/ Full-Duplex<\/td>\n<\/tr>\n<tr>\n<td>RS-485 Wiring<\/td>\n<td>2-Wire \/ 4-Wire<\/td>\n<\/tr>\n<tr>\n<td>Signaling<\/td>\n<td>Differential<\/td>\n<\/tr>\n<tr>\n<td>\u0418\u0437\u043e\u043b\u044f\u0446\u0438\u044f<\/td>\n<td>Non-Isolated<\/td>\n<\/tr>\n<tr>\n<td>Primary Function<\/td>\n<td>Multi-Port RS-485 \/ RS-422 Serial Communication<\/td>\n<\/tr>\n<tr>\n<td>\u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f<\/td>\n<td>Industrial Automation, Automated Test, Instrument Control, Production Test and Serial Data Communication<\/td>\n<\/tr>\n<\/table>\n<h3>How Does the PCIe-8431\/8 Work?<\/h3>\n<p>\nThe PCIe-8431\/8 acts as the communication interface between application software running on the host computer and external RS-485 or RS-422 devices.\n<\/p>\n<p>\nFor transmitted data:\n<\/p>\n<p>\n<strong>Application \u2192 Serial Driver \u2192 PCIe-8431\/8 \u2192 RS-485 \/ RS-422 \u2192 External Device<\/strong>\n<\/p>\n<p>\nFor received data:\n<\/p>\n<p>\n<strong>External Device \u2192 RS-485 \/ RS-422 \u2192 PCIe-8431\/8 \u2192 Serial Driver \u2192 Application<\/strong>\n<\/p>\n<p>\nEach port can communicate with compatible external equipment according to the serial settings and communication protocol configured by the application.\n<\/p>\n<h3>8-Port Serial Architecture<\/h3>\n<p>\nThe eight-port architecture allows a single computer to manage multiple independent serial communication channels.\n<\/p>\n<p>\nA typical system might use:\n<\/p>\n<p>\n<strong>Port 1 \u2192 Controller A<\/strong><br \/>\n<strong>Port 2 \u2192 Controller B<\/strong><br \/>\n<strong>Port 3 \u2192 Measurement Instrument<\/strong><br \/>\n<strong>Port 4 \u2192 Environmental Chamber<\/strong><br \/>\n<strong>Port 5 \u2192 Motion Controller<\/strong><br \/>\n<strong>Port 6 \u2192 Sensor System<\/strong><br \/>\n<strong>Port 7 \u2192 DUT Interface<\/strong><br \/>\n<strong>Port 8 \u2192 Production Equipment<\/strong>\n<\/p>\n<p>\nThis architecture is useful when each device requires an independent serial connection to the host computer.\n<\/p>\n<h3>What Is RS-485?<\/h3>\n<p>\n<strong>RS-485<\/strong> is a differential serial communication standard widely used in industrial control and automation.\n<\/p>\n<p>\nCompared with RS-232, RS-485 generally provides:\n<\/p>\n<ul>\n<li>Better electrical noise immunity<\/li>\n<li>Longer practical communication distances<\/li>\n<li>Differential signaling<\/li>\n<li>Multi-device network capability<\/li>\n<li>Better suitability for industrial environments<\/li>\n<\/ul>\n<h3>What Is RS-422?<\/h3>\n<p>\n<strong>RS-422<\/strong> is a differential serial communication standard commonly used for reliable communication between industrial equipment, instruments, controllers, and embedded devices.\n<\/p>\n<p>\nLike RS-485, differential signaling provides improved resistance to electrical interference compared with single-ended serial interfaces.\n<\/p>\n<h3>RS-485 vs RS-422<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>RS-485<\/th>\n<th>RS-422<\/th>\n<\/tr>\n<tr>\n<td>Signaling<\/td>\n<td>Differential<\/td>\n<td>Differential<\/td>\n<\/tr>\n<tr>\n<td>Multi-Device Networks<\/td>\n<td><strong>Well Suited<\/strong><\/td>\n<td>More Limited<\/td>\n<\/tr>\n<tr>\n<td>2-Wire Networks<\/td>\n<td><strong>Common<\/strong><\/td>\n<td>Typically Not Used<\/td>\n<\/tr>\n<tr>\n<td>4-Wire Communication<\/td>\n<td>Supported<\/td>\n<td><strong>Common<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Noise Immunity<\/td>\n<td>High<\/td>\n<td>High<\/td>\n<\/tr>\n<tr>\n<td>\u041f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u044b\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f<\/td>\n<td><strong>Very Common<\/strong><\/td>\n<td>Common<\/td>\n<\/tr>\n<\/table>\n<h3>2-Wire vs 4-Wire RS-485<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>2-Wire<\/th>\n<th>4-Wire<\/th>\n<\/tr>\n<tr>\n<td>Differential Pairs<\/td>\n<td>1<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>Transmit \/ Receive<\/td>\n<td>Shared<\/td>\n<td>Separate<\/td>\n<\/tr>\n<tr>\n<td>Typical Mode<\/td>\n<td>Half-Duplex<\/td>\n<td>Full-Duplex<\/td>\n<\/tr>\n<tr>\n<td>Wiring Complexity<\/td>\n<td><strong>Lower<\/strong><\/td>\n<td>Higher<\/td>\n<\/tr>\n<tr>\n<td>Simultaneous TX \/ RX<\/td>\n<td>No<\/td>\n<td><strong>\u0414\u0430<\/strong><\/td>\n<\/tr>\n<\/table>\n<h3>\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 \u041f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f<\/h3>\n<p>\nIndustrial automation is one of the primary application areas for multi-port RS-485 and RS-422 interfaces.\n<\/p>\n<p>\nThe PCIe-8431\/8 can provide communication with compatible:\n<\/p>\n<ul>\n<li>PLCs<\/li>\n<li>Machine controllers<\/li>\n<li>Motor controllers<\/li>\n<li>Industrial sensors<\/li>\n<li>Process equipment<\/li>\n<li>Building automation controllers<\/li>\n<li>Production machines<\/li>\n<li>Embedded systems<\/li>\n<\/ul>\n<p>\nA typical architecture is:\n<\/p>\n<p>\n<strong>Industrial Computer \u2192 PCIe-8431\/8 \u2192 Multiple RS-485 \/ RS-422 Devices<\/strong>\n<\/p>\n<h3>Automated Test Applications<\/h3>\n<p>\nThe PCIe-8431\/8 can integrate multiple serial devices into an automated test platform.\n<\/p>\n<p>\nA complete system can include:\n<\/p>\n<ul>\n<li>PCIe-8431\/8 serial interface<\/li>\n<li>DAQ hardware<\/li>\n<li>Oscilloscopes or digitizers<\/li>\n<li>Programmable power supplies<\/li>\n<li>Electronic loads<\/li>\n<li>Switch systems<\/li>\n<li>\u0426\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u0432\u0432\u043e\u0434-\u0432\u044b\u0432\u043e\u0434<\/li>\n<li>DUT fixtures<\/li>\n<\/ul>\n<p>\nThe host application can coordinate serial communication with measurement and stimulus hardware during automated test sequences.\n<\/p>\n<h3>Instrument Control<\/h3>\n<p>\nThe PCIe-8431\/8 can communicate with compatible instruments equipped with RS-485 or RS-422 interfaces.\n<\/p>\n<p>\nTypical operations include:\n<\/p>\n<ul>\n<li>Sending configuration commands<\/li>\n<li>Starting measurements<\/li>\n<li>Reading measurement results<\/li>\n<li>Monitoring instrument status<\/li>\n<li>Changing operating parameters<\/li>\n<li>Logging serial data<\/li>\n<\/ul>\n<h3>Production Test<\/h3>\n<p>\nThe eight-port configuration is useful in production test systems where several DUTs, fixtures, controllers, or pieces of support equipment require serial communication.\n<\/p>\n<p>\nA typical workflow is:\n<\/p>\n<ol>\n<li>Initialize the required serial ports.<\/li>\n<li>Configure communication parameters.<\/li>\n<li>Connect to the DUT or supporting equipment.<\/li>\n<li>Send initialization commands.<\/li>\n<li>Perform the required test sequence.<\/li>\n<li>Read serial response data.<\/li>\n<li>Evaluate test results.<\/li>\n<li>Store the results in the production database.<\/li>\n<\/ol>\n<h3>Multi-Device Serial Data Logging<\/h3>\n<p>\nThe PCIe-8431\/8 can also be used for serial data logging from multiple independent devices.\n<\/p>\n<p>\nFor example, a host application can continuously collect:\n<\/p>\n<ul>\n<li>Temperature data<\/li>\n<li>Controller status<\/li>\n<li>Machine operating parameters<\/li>\n<li>Sensor measurements<\/li>\n<li>Diagnostic messages<\/li>\n<li>Production data<\/li>\n<\/ul>\n<p>\nThe eight-port architecture allows data from multiple serial sources to be consolidated into one computer-based monitoring system.\n<\/p>\n<h3>Serial Communication Parameters<\/h3>\n<p>\nThe PCIe-8431\/8 and connected equipment must use compatible communication settings.\n<\/p>\n<p>\nImportant parameters include:\n<\/p>\n<ul>\n<li>Baud rate<\/li>\n<li>Data bits<\/li>\n<li>Parity<\/li>\n<li>Stop bits<\/li>\n<li>Flow-control configuration<\/li>\n<li>RS-485 or RS-422 mode<\/li>\n<li>2-wire or 4-wire configuration<\/li>\n<li>Half-duplex or full-duplex mode<\/li>\n<li>Termination<\/li>\n<li>Biasing<\/li>\n<\/ul>\n<h3>RS-485 Network Termination<\/h3>\n<p>\nCorrect termination is important for reliable RS-485 communication, particularly at higher communication rates and longer cable lengths.\n<\/p>\n<p>\nNetwork design should consider:\n<\/p>\n<ul>\n<li>Termination resistance<\/li>\n<li>Cable characteristic impedance<\/li>\n<li>Communication speed<\/li>\n<li>Cable length<\/li>\n<li>Network topology<\/li>\n<li>Number of devices<\/li>\n<li>Stub length<\/li>\n<\/ul>\n<p>\nIncorrect termination can cause signal reflections, corrupted data, intermittent communication, or complete communication failure.\n<\/p>\n<h3>RS-485 Biasing<\/h3>\n<p>\nSome RS-485 networks require bias resistors to maintain a defined bus state when no transmitter is actively driving the communication line.\n<\/p>\n<p>\nBiasing requirements should be determined according to the network topology, connected transceivers, termination arrangement, and equipment documentation.\n<\/p>\n<h3>Communication Distance and Baud Rate<\/h3>\n<p>\nThe maximum practical communication distance depends on more than the serial interface itself.\n<\/p>\n<p>\nImportant factors include:\n<\/p>\n<ul>\n<li>Baud rate<\/li>\n<li>Cable quality<\/li>\n<li>Cable impedance<\/li>\n<li>Electrical noise<\/li>\n<li>Network topology<\/li>\n<li>Termination<\/li>\n<li>Number of connected devices<\/li>\n<li>Transceiver characteristics<\/li>\n<\/ul>\n<p>\nAs communication speed increases, proper cable selection and signal-integrity design become increasingly important.\n<\/p>\n<h3>PCIe-8431\/8 vs PCIe-8430\/8<\/h3>\n<p>\nThe PCIe-8431\/8 and PCIe-8430\/8 are both eight-port PCI Express serial interfaces, but they support different serial electrical standards.\n<\/p>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>PCIe-8431\/8<\/th>\n<th>PCIe-8430\/8<\/th>\n<\/tr>\n<tr>\n<td>Serial Standard<\/td>\n<td><strong>RS-485 \/ RS-422<\/strong><\/td>\n<td>\u0420\u0421-232<\/td>\n<\/tr>\n<tr>\n<td>Number of Ports<\/td>\n<td>8<\/td>\n<td>8<\/td>\n<\/tr>\n<tr>\n<td>Signaling<\/td>\n<td><strong>Differential<\/strong><\/td>\n<td>Single-Ended<\/td>\n<\/tr>\n<tr>\n<td>Maximum Baud Rate<\/td>\n<td><strong>Up to 3 Mb\/s<\/strong><\/td>\n<td>Model Dependent<\/td>\n<\/tr>\n<tr>\n<td>Multi-Device Networks<\/td>\n<td><strong>Well Suited<\/strong><\/td>\n<td>Primarily Point-to-Point<\/td>\n<\/tr>\n<tr>\n<td>Industrial Noise Immunity<\/td>\n<td><strong>Higher<\/strong><\/td>\n<td>Lower<\/td>\n<\/tr>\n<tr>\n<td>Primary Application<\/td>\n<td>Industrial Communication<\/td>\n<td>RS-232 Instrument Control<\/td>\n<\/tr>\n<\/table>\n<h3>PCIe-8431\/8 vs PCIe-8431\/2<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>PCIe-8431\/8<\/th>\n<th>PCIe-8431\/2<\/th>\n<\/tr>\n<tr>\n<td>Serial Standard<\/td>\n<td>RS-485 \/ RS-422<\/td>\n<td>RS-485 \/ RS-422<\/td>\n<\/tr>\n<tr>\n<td>Number of Ports<\/td>\n<td><strong>8<\/strong><\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>Maximum Baud Rate<\/td>\n<td>Up to 3 Mb\/s<\/td>\n<td>Up to 3 Mb\/s<\/td>\n<\/tr>\n<tr>\n<td>Host Interface<\/td>\n<td>PCI Express<\/td>\n<td>PCI Express<\/td>\n<\/tr>\n<tr>\n<td>Best Application<\/td>\n<td><strong>Medium-Density Serial Systems<\/strong><\/td>\n<td>Low-Port-Count Systems<\/td>\n<\/tr>\n<\/table>\n<h3>PCIe-8431\/8 vs PCIe-8431\/16<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>PCIe-8431\/8<\/th>\n<th>PCIe-8431\/16<\/th>\n<\/tr>\n<tr>\n<td>Serial Standard<\/td>\n<td>RS-485 \/ RS-422<\/td>\n<td>RS-485 \/ RS-422<\/td>\n<\/tr>\n<tr>\n<td>Number of Ports<\/td>\n<td><strong>8<\/strong><\/td>\n<td><strong>16<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Maximum Baud Rate<\/td>\n<td>Up to 3 Mb\/s<\/td>\n<td>Up to 3 Mb\/s<\/td>\n<\/tr>\n<tr>\n<td>Host Interface<\/td>\n<td>PCI Express<\/td>\n<td>PCI Express<\/td>\n<\/tr>\n<tr>\n<td>Best Application<\/td>\n<td>Medium Port Count<\/td>\n<td>High Port Count<\/td>\n<\/tr>\n<\/table>\n<p>\nThe PCIe-8431\/8 is generally the more appropriate configuration when eight or fewer independent serial ports are required, while the PCIe-8431\/16 is designed for higher-density systems.\n<\/p>\n<h3>PCIe-8431\/8 vs Isolated RS-485 Interface<\/h3>\n<p>\nThe PCIe-8431\/8 is a <strong>non-isolated RS-485\/RS-422 interface<\/strong>.\n<\/p>\n<p>\nIf electrical isolation is required between the host computer and the serial network, an isolated serial interface should be selected instead.\n<\/p>\n<p>\nIsolation may be important when:\n<\/p>\n<ul>\n<li>Ground-potential differences exist<\/li>\n<li>Ground loops are possible<\/li>\n<li>Electrical noise is severe<\/li>\n<li>Equipment is distributed over large areas<\/li>\n<li>Additional electrical protection is required<\/li>\n<\/ul>\n<h3>PCIe-8431\/8 vs USB RS-485 Interface<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>PCIe-8431\/8<\/th>\n<th>Typical USB RS-485 Interface<\/th>\n<\/tr>\n<tr>\n<td>Host Interface<\/td>\n<td><strong>PCI Express<\/strong><\/td>\n<td>USB<\/td>\n<\/tr>\n<tr>\n<td>Installation<\/td>\n<td>Internal<\/td>\n<td>External<\/td>\n<\/tr>\n<tr>\n<td>Serial Ports<\/td>\n<td><strong>8<\/strong><\/td>\n<td>Model Dependent<\/td>\n<\/tr>\n<tr>\n<td>Maximum Speed<\/td>\n<td>Up to 3 Mb\/s<\/td>\n<td>Device Dependent<\/td>\n<\/tr>\n<tr>\n<td>Permanent System Integration<\/td>\n<td><strong>Well Suited<\/strong><\/td>\n<td>Application Dependent<\/td>\n<\/tr>\n<tr>\n<td>Portable Applications<\/td>\n<td>\u041e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u044b\u0439<\/td>\n<td><strong>Better<\/strong><\/td>\n<\/tr>\n<\/table>\n<h3>NI-Serial Driver<\/h3>\n<p>\nThe PCIe-8431\/8 operates with compatible <strong>NI-Serial<\/strong> software.\n<\/p>\n<p>\nThe driver provides the software interface between the operating system, application software, and serial communication hardware.\n<\/p>\n<p>\nBefore integrating the device into an existing system, verify compatibility between:\n<\/p>\n<ul>\n<li>PCIe-8431\/8 hardware<\/li>\n<li>NI-Serial version<\/li>\n<li>Host operating system<\/li>\n<li>Application software<\/li>\n<li>Development environment<\/li>\n<\/ul>\n<h3>NI-VISA Integration<\/h3>\n<p>\nCompatible serial applications can use <strong>NI-VISA<\/strong> to communicate with instruments and other serial devices through the PCIe-8431\/8.\n<\/p>\n<p>\nA typical VISA communication sequence is:\n<\/p>\n<p>\n<strong>VISA Open \u2192 Configure Serial Port \u2192 VISA Write \u2192 VISA Read \u2192 VISA Close<\/strong>\n<\/p>\n<h3>LabVIEW Integration<\/h3>\n<p>\nThe PCIe-8431\/8 can be integrated into compatible <strong>\u041b\u0430\u0431\u0412\u044c\u044e<\/strong> applications for serial communication and automation.\n<\/p>\n<p>\nTypical LabVIEW applications include:\n<\/p>\n<ul>\n<li>Industrial equipment control<\/li>\n<li>Automated testing<\/li>\n<li>Instrument communication<\/li>\n<li>Multi-port serial data logging<\/li>\n<li>Production testing<\/li>\n<li>Laboratory automation<\/li>\n<li>Device configuration<\/li>\n<\/ul>\n<h3>Modbus RTU Applications<\/h3>\n<p>\nMany Modbus RTU systems use RS-485 as their physical communication layer. The PCIe-8431\/8 can provide the required RS-485 hardware interface for compatible Modbus RTU devices.\n<\/p>\n<p>\nA typical architecture is:\n<\/p>\n<p>\n<strong>Application \/ Modbus Software \u2192 PCIe-8431\/8 \u2192 RS-485 \u2192 Modbus RTU Devices<\/strong>\n<\/p>\n<p>\nThe Modbus protocol itself must be implemented by compatible software, and all devices must use matching serial communication parameters.\n<\/p>\n<h3>Legacy Serial System Replacement<\/h3>\n<p>\nThe PCIe-8431\/8 can be used when upgrading an existing industrial or test computer while retaining RS-485 or RS-422 equipment.\n<\/p>\n<p>\nBefore replacing another serial interface, verify:\n<\/p>\n<ul>\n<li>RS-485 or RS-422 requirement<\/li>\n<li>Required number of ports<\/li>\n<li>2-wire or 4-wire architecture<\/li>\n<li>Half-duplex or full-duplex operation<\/li>\n<li>Required baud rate<\/li>\n<li>Connector and cable configuration<\/li>\n<li>Termination requirements<\/li>\n<li>Biasing requirements<\/li>\n<li>Electrical isolation requirements<\/li>\n<li>PCI Express slot availability<\/li>\n<li>NI-Serial driver compatibility<\/li>\n<li>Operating system compatibility<\/li>\n<li>Existing application software<\/li>\n<\/ul>\n<h3>Troubleshooting RS-485\/RS-422 Communication<\/h3>\n<p>\nIf communication is unstable or unavailable, check the complete serial communication path.\n<\/p>\n<ol>\n<li>Verify that the PCIe-8431\/8 is detected by the host computer.<\/li>\n<li>Confirm that the correct serial port is selected.<\/li>\n<li>Verify RS-485 or RS-422 configuration.<\/li>\n<li>Check 2-wire or 4-wire mode.<\/li>\n<li>Confirm baud rate.<\/li>\n<li>Verify data bits, parity, and stop bits.<\/li>\n<li>Check cable wiring and differential-pair polarity.<\/li>\n<li>Verify network termination.<\/li>\n<li>Check RS-485 biasing.<\/li>\n<li>Verify device addresses and communication protocol.<\/li>\n<li>Check cable length and network topology.<\/li>\n<li>Reduce the baud rate temporarily to diagnose signal-integrity problems.<\/li>\n<\/ol>\n<h3>How to Choose an RS-485\/RS-422 Interface<\/h3>\n<p>\nBefore selecting the PCIe-8431\/8, determine:\n<\/p>\n<ul>\n<li>Required serial standard<\/li>\n<li>Required number of serial ports<\/li>\n<li>Maximum required baud rate<\/li>\n<li>2-wire or 4-wire architecture<\/li>\n<li>Half-duplex or full-duplex operation<\/li>\n<li>Communication distance<\/li>\n<li>Network topology<\/li>\n<li>Termination requirements<\/li>\n<li>Biasing requirements<\/li>\n<li>Isolation requirements<\/li>\n<li>Host computer interface<\/li>\n<li>Available PCI Express slots<\/li>\n<li>Operating system compatibility<\/li>\n<li>Driver and software requirements<\/li>\n<\/ul>\n<h3>Industries<\/h3>\n<ul>\n<li>\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<li>Automated Test<\/li>\n<li>Electronic Manufacturing<\/li>\n<li>Production Test<\/li>\n<li>Process Control<\/li>\n<li>Machine Automation<\/li>\n<li>Laboratory Automation<\/li>\n<li>Research and Development<\/li>\n<li>Embedded Systems<\/li>\n<li>\u0421\u0438\u0441\u0442\u0435\u043c\u043d\u0430\u044f \u0438\u043d\u0442\u0435\u0433\u0440\u0430\u0446\u0438\u044f<\/li>\n<\/ul>\n<h3>Applications<\/h3>\n<h4>\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<p>\nThe PCIe-8431\/8 provides multi-port RS-485 and RS-422 connectivity for industrial controllers, sensors, machines, and automation equipment.\n<\/p>\n<h4>Automated Test<\/h4>\n<p>\nEight serial interfaces can connect multiple instruments, controllers, and DUTs to a computer-based automated test platform.\n<\/p>\n<h4>Instrument Control<\/h4>\n<p>\nCompatible RS-485 and RS-422 instruments can be configured, controlled, monitored, and queried through the PCIe-8431\/8.\n<\/p>\n<h4>Production Test<\/h4>\n<p>\nProduction test systems can communicate with multiple serial DUTs, fixtures, controllers, and supporting pieces of test equipment from one PCI Express interface.\n<\/p>\n<h4>Serial Data Logging<\/h4>\n<p>\nThe eight-port architecture allows a host computer to collect serial measurement, status, diagnostic, and process data from multiple independent devices.\n<\/p>\n<h4>Modbus RTU Communication<\/h4>\n<p>\nThe PCIe-8431\/8 can provide RS-485 connectivity for compatible Modbus RTU networks when used with appropriate protocol software.\n<\/p>\n<h4>Legacy Equipment Integration<\/h4>\n<p>\nExisting RS-485 and RS-422 equipment can be retained when upgrading the host computer to a PCI Express-based platform.\n<\/p>\n<h3>Recommended Related Products<\/h3>\n<table>\n<tr>\n<td width=\"220\"><strong>PCIe-8431\/2<\/strong><\/td>\n<td>2-port PCI Express RS-485\/RS-422 interface for low-port-count systems.<\/td>\n<\/tr>\n<tr>\n<td><strong>PCIe-8431\/4<\/strong><\/td>\n<td>4-port RS-485\/RS-422 interface for applications requiring moderate serial connectivity.<\/td>\n<\/tr>\n<tr>\n<td><strong>PCIe-8431\/8<\/strong><\/td>\n<td>8-port PCI Express RS-485\/RS-422 interface for medium-density industrial serial systems.<\/td>\n<\/tr>\n<tr>\n<td><strong>PCIe-8431\/16<\/strong><\/td>\n<td>16-port PCI Express RS-485\/RS-422 interface for high-density serial communication systems.<\/td>\n<\/tr>\n<tr>\n<td><strong>PCIe-8430\/8<\/strong><\/td>\n<td>8-port PCI Express RS-232 interface for equipment requiring RS-232 rather than RS-485\/RS-422.<\/td>\n<\/tr>\n<\/table>\n<h3>Why Choose PCIe-8431\/8?<\/h3>\n<ul>\n<li>Eight serial communication ports<\/li>\n<li>RS-485 support<\/li>\n<li>RS-422 support<\/li>\n<li>Up to 3 Mb\/s serial communication<\/li>\n<li>Differential signaling<\/li>\n<li>2-wire RS-485 operation<\/li>\n<li>4-wire communication<\/li>\n<li>Half-duplex support<\/li>\n<li>Full-duplex support<\/li>\n<li>PCI Express host interface<\/li>\n<li>Multi-device serial connectivity<\/li>\n<li>NI-Serial software integration<\/li>\n<li>NI-VISA compatibility<\/li>\n<li>\u0418\u043d\u0442\u0435\u0433\u0440\u0430\u0446\u0438\u044f LabVIEW<\/li>\n<li>Suitable for industrial automation<\/li>\n<li>Suitable for automated test<\/li>\n<li>Suitable for instrument control<\/li>\n<li>Suitable for production test<\/li>\n<li>Suitable for serial data logging<\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What is the NI PCIe-8431\/8?<\/h4>\n<p>\nThe NI PCIe-8431\/8 is an eight-port PCI Express serial interface device designed for RS-485 and RS-422 communication in industrial automation, automated test, and instrument-control systems.\n<\/p>\n<h4>How many serial ports does PCIe-8431\/8 have?<\/h4>\n<p>\nThe PCIe-8431\/8 provides <strong>eight serial communication ports<\/strong>.\n<\/p>\n<h4>Does PCIe-8431\/8 support RS-485?<\/h4>\n<p>\nYes. The PCIe-8431\/8 supports RS-485 differential serial communication.\n<\/p>\n<h4>Does PCIe-8431\/8 support RS-422?<\/h4>\n<p>\nYes. The device supports both <strong>RS-485 and RS-422<\/strong> communication.\n<\/p>\n<h4>What is the maximum baud rate of PCIe-8431\/8?<\/h4>\n<p>\nThe PCIe-8431\/8 supports serial communication rates up to <strong>3 Mb\/s<\/strong>, subject to the selected communication configuration and system requirements.\n<\/p>\n<h4>Does PCIe-8431\/8 support 2-wire RS-485?<\/h4>\n<p>\nYes. The device can be used for compatible 2-wire RS-485 half-duplex communication.\n<\/p>\n<h4>Does PCIe-8431\/8 support 4-wire communication?<\/h4>\n<p>\nYes. Four-wire configurations can be used when separate transmit and receive differential pairs are required.\n<\/p>\n<h4>Is PCIe-8431\/8 isolated?<\/h4>\n<p>\nThe PCIe-8431\/8 is a <strong>non-isolated<\/strong> serial interface. Applications requiring electrical isolation should use an appropriate isolated RS-485\/RS-422 interface.\n<\/p>\n<h4>Can PCIe-8431\/8 communicate with Modbus RTU devices?<\/h4>\n<p>\nYes, when the Modbus equipment uses a compatible RS-485 physical interface. The PCIe-8431\/8 provides the serial hardware interface, while the Modbus RTU protocol must be implemented by compatible software.\n<\/p>\n<h4>Can PCIe-8431\/8 communicate with multiple devices?<\/h4>\n<p>\nYes. Its eight serial ports allow the host computer to communicate with multiple independent RS-485 or RS-422 devices. RS-485 ports may also be integrated into compatible multidrop network architectures.\n<\/p>\n<h4>What is the difference between PCIe-8431\/8 and PCIe-8430\/8?<\/h4>\n<p>\nThe PCIe-8431\/8 is designed for <strong>RS-485 and RS-422<\/strong>, while the PCIe-8430\/8 is designed for <strong>\u0420\u0421-232<\/strong>. The correct model should be selected according to the electrical serial standard used by the external equipment.\n<\/p>\n<h4>What is the difference between PCIe-8431\/8 and PCIe-8431\/16?<\/h4>\n<p>\nBoth belong to the same RS-485\/RS-422 serial interface family. The PCIe-8431\/8 provides eight serial ports, while the PCIe-8431\/16 provides sixteen ports for higher-density applications.\n<\/p>\n<h4>What is the difference between PCIe-8431\/8 and PCIe-8431\/2?<\/h4>\n<p>\nThe primary difference is port count. PCIe-8431\/8 provides eight RS-485\/RS-422 serial ports, while PCIe-8431\/2 provides two ports. The appropriate model depends on the number of independent serial connections required.\n<\/p>\n<h4>Can PCIe-8431\/8 be used with LabVIEW?<\/h4>\n<p>\nYes. The PCIe-8431\/8 can be integrated into compatible LabVIEW applications for serial communication, automated testing, industrial equipment control, and data logging.\n<\/p>\n<h4>Can PCIe-8431\/8 be used with NI-VISA?<\/h4>\n<p>\nYes. Compatible NI-VISA applications can communicate with serial instruments and other devices connected through the PCIe-8431\/8.\n<\/p>\n<h4>Why is my RS-485 device not communicating with PCIe-8431\/8?<\/h4>\n<p>\nCheck the RS-485 wiring polarity, baud rate, data bits, parity, stop bits, 2-wire or 4-wire configuration, termination, network biasing, device address, communication protocol, and cable topology.\n<\/p>\n<h4>What should I check before purchasing PCIe-8431\/8?<\/h4>\n<p>\nVerify the RS-485\/RS-422 requirement, required number of ports, baud rate, 2-wire or 4-wire configuration, half-duplex or full-duplex operation, isolation requirements, connector and cable configuration, network termination and biasing, PCI Express slot availability, NI-Serial driver compatibility, operating system, NI-VISA, LabVIEW, and existing application software.\n<\/p>\n<h3>\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>NI PCIe-8431\/8 8-Port RS-485\/RS-422 Serial Interface Device<\/strong> provides eight differential serial communication ports through a PCI Express host interface. With support for RS-485, RS-422, communication rates up to 3 Mb\/s, 2-wire and 4-wire configurations, and multi-device connectivity, it is well suited for industrial automation, automated test, instrument control, production testing, Modbus RTU systems, serial data logging, and integration of existing RS-485\/RS-422 equipment.<\/p>","protected":false},"excerpt":{"rendered":"<p>Supported Power Input: \u2014<br \/>\nBus Connection: PCI Express<br \/>\n\u0422\u0438\u043f \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u0438: \u041d\u0435\u0442<br \/>\n\u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043f\u043e\u0440\u0442\u043e\u0432: 8<br \/>\nSupported Serial Protocols: RS485#RS422<br \/>\nOperating Temperature Range: \u2014<br \/>\nMaximum Baud Rate: \u2014<br \/>\nFront Connection Type: VHDCI(1)<br \/>\nNumber of Bidirectional Digital Channels: \u2014<\/p>","protected":false},"featured_media":33628,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[674],"product_tag":[],"class_list":["post-34621","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":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI PCIe-8431\/8 PCIe Serial Interface Device 780592-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"NI PCIe-8431\/8 is an 8-port PCI Express RS-485\/RS-422 serial interface supporting up to 3 Mb\/s for industrial communication, automation and instrument control.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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