{"id":34918,"date":"2026-08-08T16:51:51","date_gmt":"2026-08-08T08:51:51","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=34918"},"modified":"2026-09-06T21:24:03","modified_gmt":"2026-09-06T13:24:03","slug":"pxi-8433-4","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pxi-8433-4\/","title":{"rendered":"PXI-8433\/4"},"content":{"rendered":"<h3>PXI-8433\/4 4-Port Isolated RS485\/RS422 Interface<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>PXI-8433\/4<\/strong> is a four-port isolated RS485 and RS422 serial interface module for PXI systems. It is designed for high-speed, long-distance and electrically robust communication with industrial devices, controllers and distributed instrumentation.<\/p>\n<p>Each port supports communication rates up to 3 Mbps and provides isolation from the host system and other serial ports. The RS485\/RS422 architecture offers differential signaling with better noise immunity than conventional single-ended RS232 communication.<\/p>\n<h3>Key Features of the PXI-8433\/4<\/h3>\n<ul>\n<li>Four independent isolated serial ports<\/li>\n<li>RS485 and RS422 communication support<\/li>\n<li>Maximum transfer rate up to 3 Mbps<\/li>\n<li>Port-to-port electrical isolation<\/li>\n<li>Port-to-computer isolation<\/li>\n<li>128-byte transmit and receive FIFOs<\/li>\n<li>DMA-based serial data transfers<\/li>\n<li>Four 10-position modular connectors<\/li>\n<li>Supports two-wire and four-wire communication modes<\/li>\n<li>Suitable for multipoint RS485 networks<\/li>\n<li>Standard COM-port and NI-VISA access<\/li>\n<li>NI-Serial software support<\/li>\n<\/ul>\n<h3>PXI-8433\/4 Technical Specifications<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>PXI-8433\/4<\/td>\n<\/tr>\n<tr>\n<th>Part Number<\/th>\n<td>779539-01<\/td>\n<\/tr>\n<tr>\n<th>Product Type<\/th>\n<td>Isolated PXI serial interface<\/td>\n<\/tr>\n<tr>\n<th>Supported Standards<\/th>\n<td>RS485 and RS422<\/td>\n<\/tr>\n<tr>\n<th>Number of Ports<\/th>\n<td>4<\/td>\n<\/tr>\n<tr>\n<th>Maximum Baud Rate<\/th>\n<td>3 Mbps<\/td>\n<\/tr>\n<tr>\n<th>FIFO Size<\/th>\n<td>128 \u0431\u0430\u0439\u0442<\/td>\n<\/tr>\n<tr>\n<th>Isolation Type<\/th>\n<td>Port-to-port and port-to-host isolation<\/td>\n<\/tr>\n<tr>\n<th>Communication Modes<\/th>\n<td>RS422 full duplex and RS485 two-wire or four-wire operation<\/td>\n<\/tr>\n<tr>\n<th>Front Connectors<\/th>\n<td>4 \u00d7 10-position modular jacks<\/td>\n<\/tr>\n<tr>\n<th>RS422 Output Voltage Range<\/th>\n<td>Approximately \u00b17 V maximum range<\/td>\n<\/tr>\n<tr>\n<th>RS485 Common-Mode Range<\/th>\n<td>Approximately -7 V to +12 V<\/td>\n<\/tr>\n<tr>\n<th>Operating Temperature<\/th>\n<td>0\u00b0C to 55\u00b0C<\/td>\n<\/tr>\n<tr>\n<th>Storage Temperature<\/th>\n<td>-20\u00b0C to 70\u00b0C<\/td>\n<\/tr>\n<tr>\n<th>Dimensions<\/th>\n<td>100 mm \u00d7 160 mm, 3U<\/td>\n<\/tr>\n<tr>\n<th>Module Width<\/th>\n<td>One PXI slot<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>PXI-8433\/4 Part Number and Accessories<\/h3>\n<table>\n<tbody>\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<tr>\n<td>PXI-8433\/4<\/td>\n<td>779539-01<\/td>\n<td>Four-port isolated RS485\/RS422 PXI interface<\/td>\n<\/tr>\n<tr>\n<td>10P10C Serial Cable<\/td>\n<td>Verify pinout and termination when ordering<\/td>\n<td>Connects an individual modular port to the RS485 or RS422 network<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>RS422 Full-Duplex Communication<\/h3>\n<p>RS422 normally uses separate differential pairs for transmitting and receiving data. This full-duplex arrangement allows simultaneous communication in both directions between the PXI module and a compatible device.<\/p>\n<p>RS422 is commonly used for point-to-point or multidrop communication where greater cable length and noise immunity are required.<\/p>\n<h3>RS485 Multipoint Networks<\/h3>\n<p>RS485 supports multiple transceivers on a shared differential bus. The PXI-8433\/4 can be used as the master or another participating device in compatible two-wire or four-wire networks.<\/p>\n<p>Correct termination and biasing are critical. Termination resistors are normally installed at the physical ends of the bus rather than at every node.<\/p>\n<h3>Isolation for Industrial Installations<\/h3>\n<p>Each PXI-8433\/4 port is isolated from the host and other ports. This helps protect communication when devices are distributed across different cabinets, grounding systems or power domains.<\/p>\n<p>Isolation also helps prevent a problem on one serial network from disrupting other networks connected to the module.<\/p>\n<h3>3 Mbps Maximum Baud Rate<\/h3>\n<p>The module supports communication rates up to 3 Mbps. Maximum usable cable length normally decreases as the baud rate increases.<\/p>\n<p>Cable impedance, termination, topology, stub length and connected transceivers must all be considered when designing a high-speed RS485 network.<\/p>\n<h3>Typical PXI-8433\/4 Applications<\/h3>\n<ul>\n<li>Industrial RS485 networks<\/li>\n<li>RS422 instrument communication<\/li>\n<li>PLC and motion-control systems<\/li>\n<li>Distributed sensor networks<\/li>\n<li>Automotive controller testing<\/li>\n<li>Aerospace and defense test systems<\/li>\n<li>Manufacturing automation<\/li>\n<li>Environmental test equipment<\/li>\n<li>Multi-drop serial communication<\/li>\n<li>Long-distance device control<\/li>\n<\/ul>\n<h3>NI-Serial and NI-VISA Integration<\/h3>\n<p>NI-Serial presents the four interfaces as standard COM ports. Application software can configure the transceiver mode, baud rate, character format and flow-control behavior.<\/p>\n<p>NI-VISA enables common serial read-and-write functions from LabVIEW, LabWindows\/CVI and other supported development environments.<\/p>\n<h3>PXI-8433\/4 Troubleshooting<\/h3>\n<h4>No device responds on an RS485 network<\/h4>\n<p>Check A\/B polarity, termination, biasing and two-wire versus four-wire mode. Different manufacturers may label differential conductors differently.<\/p>\n<h4>Only the nearest device communicates<\/h4>\n<p>Inspect bus topology, termination placement and cable continuity. Long stubs and star wiring can produce reflections at higher baud rates.<\/p>\n<h4>Communication works at low speed only<\/h4>\n<p>Reduce cable length, improve termination and use twisted-pair cable with the correct impedance. Check the response time of every connected device.<\/p>\n<h4>Received data is echoed unexpectedly<\/h4>\n<p>Review the selected transceiver mode and application settings. Some two-wire RS485 configurations can receive the data being transmitted.<\/p>\n<h4>One network interferes with another<\/h4>\n<p>Verify the isolation and wiring for each port. Ensure that shields, references and cable drains have not created an unintended connection between networks.<\/p>\n<h3>PXI-8433\/4 vs PXI-8432\/4<\/h3>\n<table>\n<tbody>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>PXI-8433\/4<\/th>\n<th><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-8432-4\/\">PXI-8432\/4<\/a><\/th>\n<\/tr>\n<tr>\n<td>Serial Standard<\/td>\n<td>RS485 and RS422<\/td>\n<td>RS232<\/td>\n<\/tr>\n<tr>\n<td>Ports<\/td>\n<td>4 isolated ports<\/td>\n<td>4 isolated ports<\/td>\n<\/tr>\n<tr>\n<td>Maximum Baud Rate<\/td>\n<td>3 Mbps<\/td>\n<td>1 Mbps<\/td>\n<\/tr>\n<tr>\n<td>Signaling<\/td>\n<td>Differential<\/td>\n<td>Single-ended<\/td>\n<\/tr>\n<tr>\n<td>Best Suited For<\/td>\n<td>Long-distance and multipoint networks<\/td>\n<td>Conventional point-to-point RS232 devices<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Recommended Related Products<\/h3>\n<ul>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-8433-2\/\">PXI-8433\/2 Isolated RS485\/RS422 Interface<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-8432-4\/\">PXI-8432\/4 Isolated RS232 Interface<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-8431-4\/\">PXI-8431\/4 Nonisolated RS485\/RS422 Interface<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-8431-2\/\">PXI-8431\/2 RS485\/RS422 Interface<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-gpib\/\">PXI-GPIB Instrument Control Module<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product-category\/%d0%bd%d0%b8\/pxi-%d1%81%d0%b8%d1%81%d1%82%d0%b5%d0%bc%d1%81\/%d0%bc%d0%be%d0%b4%d1%83%d0%bb%d0%b8-pxi\/\">View More NI PXI Modules<\/a><\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What is the PXI-8433\/4?<\/h4>\n<p>It is a four-port isolated RS485 and RS422 serial interface for PXI systems.<\/p>\n<h4>What is its maximum baud rate?<\/h4>\n<p>The maximum supported communication rate is 3 Mbps.<\/p>\n<h4>Can it communicate with multiple RS485 devices?<\/h4>\n<p>Yes. It can be used in correctly designed multipoint RS485 networks.<\/p>\n<h4>Does it support RS422?<\/h4>\n<p>Yes. It supports differential RS422 communication as well as RS485 modes.<\/p>\n<h4>Does it provide port-to-port isolation?<\/h4>\n<p>Yes. Each serial port is isolated from the computer interface and the other ports.<\/p>\n<h4>What is the PXI-8433\/4 part number?<\/h4>\n<p>The NI ordering part number is <strong>779539-01<\/strong>.<\/p>\n<h3>Request a Quote for the PXI-8433\/4<\/h3>\n<p>Contact us for availability and project pricing for the <strong>PXI-8433\/4 4-Port Isolated RS485\/RS422 Interface<\/strong>. We can also help confirm compatible cables, termination requirements and alternative NI serial modules.<\/p>","protected":false},"excerpt":{"rendered":"<p>PXI-8433\/4 4-Port Isolated RS485\/RS422 Interface The PXI-8433\/4 is a four-port isolated RS485 and RS422 serial interface module for PXI systems.<\/p>","protected":false},"featured_media":34828,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[667],"product_tag":[],"class_list":["post-34918","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pxi-modules","first","instock","shipping-taxable","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 PXI-8433\/4 PXI Serial Interface Module 779539-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"The PXI-8433\/4 is a 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