{"id":32688,"date":"2026-05-12T09:37:35","date_gmt":"2026-05-12T01:37:35","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=32688"},"modified":"2026-08-29T11:22:09","modified_gmt":"2026-08-29T03:22:09","slug":"pxie-8431-8","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pxie-8431-8\/","title":{"rendered":"PXIe-8431\/8"},"content":{"rendered":"<h3>PXIe-8431\/8 8-Port RS-485\/RS-422 Serial Interface Module<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>PXIe-8431\/8<\/strong> is an 8-port PXI Express serial interface module designed for high-speed communication with RS-485 and RS-422 instruments, controllers, sensors and industrial devices. Each port supports configurable 2-wire or 4-wire transceiver operation for half-duplex and full-duplex communication.<\/p>\n<p>With communication rates up to <strong>3 Mbaud<\/strong>, DMA-based data transfers and compatibility with standard Windows COM-port applications, the PXIe-8431\/8 provides a scalable serial interface for automated test, industrial monitoring and hardware validation systems.<\/p>\n<h3>Key Features of the PXIe-8431\/8<\/h3>\n<ul>\n<li>8 independent serial communication ports<\/li>\n<li>Supports RS-485 and RS-422 standards<\/li>\n<li>Maximum communication rate of 3 Mbaud<\/li>\n<li>Selectable 2-wire and 4-wire transceiver modes<\/li>\n<li>Supports half-duplex and full-duplex communication<\/li>\n<li>DMA-based data transfers<\/li>\n<li>Multithreading and multiprocessor support<\/li>\n<li>Appears as standard COM ports in supported operating systems<\/li>\n<li>Single 68-pin VHDCI front connector<\/li>\n<li>Includes a VHDCI-to-eight-DB9 serial cable<\/li>\n<li>PXI Express interface<\/li>\n<li>Compatible with NI-Serial software<\/li>\n<\/ul>\n<h3>PXIe-8431\/8 Technical Specifications<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>PXIe-8431\/8<\/td>\n<\/tr>\n<tr>\n<th>Part Number<\/th>\n<td>781473-01<\/td>\n<\/tr>\n<tr>\n<th>Product Type<\/th>\n<td>PXI Express Serial Interface Module<\/td>\n<\/tr>\n<tr>\n<th>Number of Serial Ports<\/th>\n<td>8<\/td>\n<\/tr>\n<tr>\n<th>Supported Serial Standards<\/th>\n<td>RS-485 and RS-422<\/td>\n<\/tr>\n<tr>\n<th>Maximum Baud Rate<\/th>\n<td>3 Mbaud<\/td>\n<\/tr>\n<tr>\n<th>Transceiver Modes<\/th>\n<td>2-wire and 4-wire<\/td>\n<\/tr>\n<tr>\n<th>Communication Modes<\/th>\n<td>Half-duplex and full-duplex<\/td>\n<\/tr>\n<tr>\n<th>Electrical Isolation<\/th>\n<td>Non-isolated<\/td>\n<\/tr>\n<tr>\n<th>Data Transfer<\/th>\n<td>DMA<\/td>\n<\/tr>\n<tr>\n<th>Operating System Interface<\/th>\n<td>Standard COM ports<\/td>\n<\/tr>\n<tr>\n<th>Front Connector<\/th>\n<td>1 \u00d7 68-pin VHDCI<\/td>\n<\/tr>\n<tr>\n<th>Included Cable<\/th>\n<td>1 m, 68-pin VHDCI to eight 9-pin D-SUB connectors<\/td>\n<\/tr>\n<tr>\n<th>Included Cable Part Number<\/th>\n<td>197546-01<\/td>\n<\/tr>\n<tr>\n<th>\u0428\u0438\u043d\u043d\u044b\u0439 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441<\/th>\n<td>PXI Express<\/td>\n<\/tr>\n<tr>\n<th>Software Driver<\/th>\n<td>NI-Serial<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Part Number and Included Cable<\/h3>\n<table>\n<thead>\n<tr>\n<th>Item<\/th>\n<th>Part Number<\/th>\n<th>\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>PXIe-8431\/8<\/td>\n<td>781473-01<\/td>\n<td>8-port RS-485\/RS-422 PXI Express serial interface module<\/td>\n<\/tr>\n<tr>\n<td>68VHDCI-DB9M Serial Cable<\/td>\n<td>197546-01<\/td>\n<td>1 m cable with one 68-pin VHDCI connector and eight DB9 male connectors<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Eight Independent Serial Ports<\/h3>\n<p>The PXIe-8431\/8 provides eight independent RS-485\/RS-422 communication ports from one PXI Express slot. Each port appears separately in the operating system and can communicate with a different device using its own baud rate and serial configuration.<\/p>\n<p>This high port density reduces the number of modules required when an automated test system must communicate with multiple controllers, sensors, instruments or embedded devices.<\/p>\n<h3>RS-485 and RS-422 Communication<\/h3>\n<p>RS-485 and RS-422 use differential signaling, providing better noise immunity and longer practical cable distances than typical single-ended RS-232 communication. These standards are commonly used in industrial equipment, motion-control systems and embedded electronics.<\/p>\n<p>The correct electrical standard, wire configuration, termination, biasing and device addressing must be selected according to the connected equipment and network design.<\/p>\n<h3>Two-Wire Half-Duplex Operation<\/h3>\n<p>In 2-wire mode, transmitting and receiving share one differential pair. This configuration is commonly used for multidrop RS-485 networks in which multiple devices communicate over the same bus.<\/p>\n<p>Only one device should normally drive the bus at a time. The software and communication protocol must control transmission direction and prevent multiple transmitters from creating bus contention.<\/p>\n<h3>Four-Wire Full-Duplex Operation<\/h3>\n<p>Four-wire mode uses separate differential pairs for transmitting and receiving. It supports full-duplex communication when the connected device can transmit and receive simultaneously.<\/p>\n<p>This configuration is also suitable for RS-422 point-to-point or multidrop receiver systems. Confirm the pinout and communication mode before connecting the included DB9 cable.<\/p>\n<h3>Communication Rates up to 3 Mbaud<\/h3>\n<p>The PXIe-8431\/8 supports serial communication rates up to 3 Mbaud. The usable rate for a particular installation depends on cable length, cable impedance, termination, network topology, electrical noise and the capabilities of the connected devices.<\/p>\n<p>Lower baud rates may be necessary for long cable runs or multidrop networks. High-speed installations should use appropriate twisted-pair cable and properly placed termination resistors.<\/p>\n<h3>DMA and Multithreaded Performance<\/h3>\n<p>The module uses DMA transfers to move serial data with reduced host-processor involvement. It also supports multithreaded and multiprocessor applications, allowing several ports to communicate concurrently in larger automated systems.<\/p>\n<p>These capabilities are useful when the test application must continuously monitor multiple serial devices while performing measurements, logging data or executing other test operations.<\/p>\n<h3>Standard COM-Port Compatibility<\/h3>\n<p>After installing NI-Serial, the PXIe-8431\/8 ports appear as standard COM ports in supported operating systems. Existing software written for conventional serial interfaces can often use the module without extensive changes.<\/p>\n<p>Applications can access the ports through NI-VISA, standard serial APIs or other software that supports Windows COM-port communication.<\/p>\n<h3>Typical PXIe-8431\/8 Applications<\/h3>\n<ul>\n<li>Automated communication with multiple serial instruments<\/li>\n<li>RS-485 multidrop network testing<\/li>\n<li>RS-422 device validation<\/li>\n<li>Industrial controller communication<\/li>\n<li>Embedded system testing<\/li>\n<li>Motion controller and drive communication<\/li>\n<li>Sensor and actuator monitoring<\/li>\n<li>Electronic control unit validation<\/li>\n<li>Production-line functional testing<\/li>\n<li>Data logging from multiple serial devices<\/li>\n<li>Hardware-in-the-loop test systems<\/li>\n<li>Laboratory automation<\/li>\n<\/ul>\n<h3>Software and Driver Support<\/h3>\n<p>The PXIe-8431\/8 requires the NI-Serial driver. NI-Serial provides hardware configuration, COM-port integration and serial communication support for compatible NI software and programming environments.<\/p>\n<p>The module can be used with NI-VISA, LabVIEW, LabWindows\/CVI, TestStand, C\/C++, C# and other applications capable of communicating through standard serial ports.<\/p>\n<h3>Cable and Connection Requirements<\/h3>\n<p>The PXIe-8431\/8 includes a 1 m cable with one 68-pin VHDCI connector and eight male DB9 connectors. The included RS-485\/RS-422 cable has part number <strong>197546-01<\/strong>.<\/p>\n<p>Verify the pinout of the connected equipment before wiring the system. RS-485 and RS-422 equipment does not always use the same DB9 pin assignment, so a custom adapter or cable may be necessary.<\/p>\n<h3>Termination and Biasing<\/h3>\n<p>RS-485 and RS-422 networks may require termination resistors at the ends of the transmission line to reduce signal reflections. Two-wire RS-485 networks may also require bias resistors to maintain a known bus state when no transmitter is active.<\/p>\n<p>Incorrect or excessive termination can load the network and cause communication errors. Follow the connected equipment manufacturer\u2019s recommendations for termination, biasing, cable impedance and maximum node count.<\/p>\n<h3>PXI Chassis and System Integration<\/h3>\n<p>The PXIe-8431\/8 requires a compatible PXI Express chassis and controller. Suitable chassis options include the <a href=\"https:\/\/pxisource.com\/ru\/product\/pxie-1092\/\">PXIe-1092<\/a>, <a href=\"https:\/\/pxisource.com\/ru\/product\/pxie-1085\/\">PXIe-1085<\/a> and other NI PXI Express chassis with an available compatible peripheral slot.<\/p>\n<p>The host controller must support the required NI-Serial driver and operating system. Confirm software compatibility before installing the module in an existing PXI system.<\/p>\n<h3>Installation and Troubleshooting<\/h3>\n<h4>Module Is Not Detected<\/h4>\n<p>Confirm that the PXIe-8431\/8 is installed in a compatible PXI Express slot. Verify the chassis connection, controller operation and NI-Serial driver installation before checking the module in NI Measurement &amp; Automation Explorer.<\/p>\n<h4>COM Ports Do Not Appear<\/h4>\n<p>Restart the controller after installing NI-Serial and check Windows Device Manager or NI MAX. Confirm that the installed NI-Serial version supports the controller\u2019s operating system.<\/p>\n<h4>No Data Is Received<\/h4>\n<p>Check the baud rate, data bits, parity, stop bits and flow-control configuration. Verify the DB9 pinout and confirm that the transmitting and receiving differential pairs are connected correctly.<\/p>\n<h4>Communication Works Only in One Direction<\/h4>\n<p>Confirm whether the connected device requires 2-wire half-duplex or 4-wire full-duplex operation. Check the transmit and receive pair assignments and verify direction control in half-duplex mode.<\/p>\n<h4>Communication Is Unstable<\/h4>\n<p>Reduce the baud rate and inspect the cable, grounding, termination and biasing. Keep serial cables separated from motors, power converters and other sources of electrical interference.<\/p>\n<h4>Ground-Potential Differences Cause Errors<\/h4>\n<p>The PXIe-8431\/8 is not electrically isolated. If devices operate at substantially different ground potentials or the installation has severe common-mode<\/p>","protected":false},"excerpt":{"rendered":"<p>\u0428\u0438\u043d\u043d\u044b\u0439 \u0441\u043e\u0435\u0434\u0438\u043d\u0438\u0442\u0435\u043b\u044c: PXI 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 \/>\n\u041f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b: RS422, RS485<\/p>","protected":false},"featured_media":31865,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[667],"product_tag":[],"class_list":["post-32688","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pxi-modules","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 v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI PXIe-8431\/8 PXI Serial Interface Module 781473-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"The PXIe-8431\/8 is an 8-port, non-isolated RS-485\/RS-422 PXI Express serial module supporting 2- or 4-wire communication at rates up to 3 Mbaud.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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