{"id":29622,"date":"2025-09-18T10:29:05","date_gmt":"2025-09-18T02:29:05","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=29622"},"modified":"2026-08-27T20:40:45","modified_gmt":"2026-08-27T12:40:45","slug":"ni-9871","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/ni-9871\/","title":{"rendered":"NI-9871"},"content":{"rendered":"<h3>Product Introduction<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>NI-9871<\/strong> \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f <strong>4-port C Series RS-485\/RS-422 serial interface module<\/strong> designed for industrial, embedded, and automated test applications that require reliable differential serial communication.\n<\/p>\n<p>\nThe NI-9871 provides <strong>four independent RS-485\/RS-422 serial ports<\/strong> and supports communication rates up to <strong>3.6864 Mbps<\/strong>. Its differential signaling architecture provides improved noise immunity and supports substantially longer cable distances than conventional RS-232 communication.\n<\/p>\n<p>\nThe module is particularly suitable for industrial automation, machine control, distributed instrumentation, serial sensor networks, embedded systems, laboratory automation, and legacy equipment integration.\n<\/p>\n<h3>Product Overview<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>National Instruments NI-9871<\/strong> belongs to the NI C Series serial interface family and provides four RS-485\/RS-422 communication interfaces in a single C Series module.\n<\/p>\n<p>\nA typical communication architecture is:\n<\/p>\n<p>\n<strong>RS-485 \/ RS-422 Devices \u2192 NI-9871 \u2192 CompactRIO \u2192 Real-Time \/ FPGA Application<\/strong>\n<\/p>\n<p>\nThe NI-9871 can be combined with analog, digital, sensor, and control C Series modules to create an integrated industrial measurement and communication system.\n<\/p>\n<h3>Key Features<\/h3>\n<h4>4 RS-485\/RS-422 Serial Ports<\/h4>\n<p>\nThe NI-9871 provides <strong>four independent serial communication ports<\/strong>.\n<\/p>\n<p>\nEach port can be used to communicate with compatible RS-485 or RS-422 equipment, allowing multiple serial devices or networks to be integrated through a single C Series module.\n<\/p>\n<p>\nTypical connected devices include:\n<\/p>\n<ul>\n<li>Industrial controllers<\/li>\n<li>Serial sensors<\/li>\n<li>Motor drives<\/li>\n<li>Motion controllers<\/li>\n<li>PLC equipment<\/li>\n<li>Remote I\/O devices<\/li>\n<li>Industrial instruments<\/li>\n<li>Embedded controllers<\/li>\n<li>Machine-control equipment<\/li>\n<li>Legacy RS-485 devices<\/li>\n<\/ul>\n<h4>RS-485 Communication<\/h4>\n<p>\nThe NI-9871 supports <strong>RS-485 differential serial communication<\/strong>.\n<\/p>\n<p>\nRS-485 is widely used in industrial environments because differential signaling provides good resistance to electrical noise and supports longer communication distances than typical RS-232 connections.\n<\/p>\n<p>\nThe NI-9871 can be incorporated into systems using both <strong>2-wire and 4-wire RS-485 configurations<\/strong>.\n<\/p>\n<h4>RS-422 Communication<\/h4>\n<p>\nThe NI-9871 also supports <strong>RS-422<\/strong> communication.\n<\/p>\n<p>\nRS-422 uses differential signaling and is commonly used for reliable serial communication between industrial and embedded devices.\n<\/p>\n<p>\nThis makes the NI-9871 suitable for systems containing equipment that requires either RS-485 or RS-422 physical interfaces.\n<\/p>\n<h4>Up to 3.6864 Mbps<\/h4>\n<p>\nThe NI-9871 supports a maximum serial communication rate of <strong>3.6864 Mbps<\/strong>.\n<\/p>\n<p>\nThis provides substantially higher maximum serial throughput than many conventional industrial serial interfaces.\n<\/p>\n<p>\nThe actual baud rate used in an application depends on the supported baud-rate calculation, communication configuration, connected device, and system requirements.\n<\/p>\n<h4>Long-Distance Communication<\/h4>\n<p>\nThe NI-9871 supports cable lengths up to approximately <strong>1.2 km (4,000 ft)<\/strong> under appropriate system conditions.\n<\/p>\n<p>\nThis makes the module particularly useful for distributed industrial systems where equipment is located far from the controller.\n<\/p>\n<h4>Differential Signaling<\/h4>\n<p>\nBoth RS-485 and RS-422 use differential electrical signaling.\n<\/p>\n<p>\nInstead of representing data relative to a single signal ground, differential communication uses the voltage difference between paired conductors.\n<\/p>\n<p>\nAdvantages include:\n<\/p>\n<ul>\n<li>Improved noise immunity<\/li>\n<li>Longer cable distances<\/li>\n<li>Reliable industrial communication<\/li>\n<li>Better performance in electrically noisy environments<\/li>\n<\/ul>\n<h4>2-Wire RS-485 Support<\/h4>\n<p>\nThe NI-9871 can communicate with <strong>2-wire RS-485 devices<\/strong>.\n<\/p>\n<p>\nFor 2-wire operation, the transmit and receive differential pairs must be connected appropriately according to the NI-9871 wiring requirements.\n<\/p>\n<p>\nA simplified connection is:\n<\/p>\n<p>\n<strong>RX+ + TX+ \u2192 Device Data+<\/strong><br \/>\n<strong>RX- + TX- \u2192 Device Data-<\/strong><br \/>\n<strong>GND \u2192 Device GND<\/strong>\n<\/p>\n<h4>4-Wire RS-485 Support<\/h4>\n<p>\nThe NI-9871 can also communicate with <strong>4-wire RS-485 devices<\/strong>.\n<\/p>\n<p>\nIn a four-wire configuration, separate differential pairs are used for transmitting and receiving.\n<\/p>\n<p>\nA simplified architecture is:\n<\/p>\n<p>\n<strong>NI RX+ \u2190 Device TX+<\/strong><br \/>\n<strong>NI RX- \u2190 Device TX-<\/strong><br \/>\n<strong>NI TX+ \u2192 Device RX+<\/strong><br \/>\n<strong>NI TX- \u2192 Device RX-<\/strong><br \/>\n<strong>GND \u2194 GND<\/strong>\n<\/p>\n<h4>Individual Port Buffers<\/h4>\n<p>\nThe NI-9871 provides individual hardware buffering for its serial ports.\n<\/p>\n<p>\nThese buffers help manage serial data transfers and reduce the FPGA resources required for basic serial communication handling.\n<\/p>\n<h4>External Power<\/h4>\n<p>\nThe NI-9871 requires an <strong>external power supply<\/strong> for operation of its serial transceivers.\n<\/p>\n<p>\nThe supported external supply range is approximately <strong>8 VDC to 28 VDC<\/strong>.\n<\/p>\n<p>\nExternal power helps provide reliable transceiver operation across supported serial communication conditions.\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>C Series Serial Interface Module<\/td>\n<\/tr>\n<tr>\n<td>\u041c\u043e\u0434\u0435\u043b\u044c<\/td>\n<td>NI-9871<\/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>Platform<\/td>\n<td>NI C Series<\/td>\n<\/tr>\n<tr>\n<td>Serial Standards<\/td>\n<td>RS-485 \/ RS-422<\/td>\n<\/tr>\n<tr>\n<td>Number of Ports<\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>Communication Type<\/td>\n<td>Differential Serial<\/td>\n<\/tr>\n<tr>\n<td>Maximum Baud Rate<\/td>\n<td>3.6864 Mbps<\/td>\n<\/tr>\n<tr>\n<td>Maximum Cable Length<\/td>\n<td>1.2 km (4,000 ft)<\/td>\n<\/tr>\n<tr>\n<td>RS-485 Modes<\/td>\n<td>2-Wire \/ 4-Wire<\/td>\n<\/tr>\n<tr>\n<td>RS-422 Support<\/td>\n<td>\u0414\u0430<\/td>\n<\/tr>\n<tr>\n<td>Data Bits<\/td>\n<td>5, 6, 7, 8<\/td>\n<\/tr>\n<tr>\n<td>Stop Bits<\/td>\n<td>1, 1.5, 2<\/td>\n<\/tr>\n<tr>\n<td>Flow Control<\/td>\n<td>XON\/XOFF, RTS\/CTS, None<\/td>\n<\/tr>\n<tr>\n<td>Port Buffer<\/td>\n<td>Individual UART FIFO Buffer per Port<\/td>\n<\/tr>\n<tr>\n<td>\u0422\u0438\u043f \u0440\u0430\u0437\u044a\u0435\u043c\u0430<\/td>\n<td>RJ50<\/td>\n<\/tr>\n<tr>\n<td>Number of Connectors<\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>External Supply Voltage<\/td>\n<td>8 VDC to 28 VDC<\/td>\n<\/tr>\n<tr>\n<td>Data Line ESD Protection<\/td>\n<td>\u00b115 kV Human Body Model<\/td>\n<\/tr>\n<tr>\n<td>Maximum External Supply Power<\/td>\n<td>3.5 W<\/td>\n<\/tr>\n<tr>\n<td>Operating Temperature<\/td>\n<td>-40 \u00b0C \u0434\u043e 70 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Primary Applications<\/td>\n<td>Industrial Serial Communication, Machine Control, Embedded Systems and Automated Test<\/td>\n<\/tr>\n<\/table>\n<h3>How Does the NI-9871 Work?<\/h3>\n<p>\nThe NI-9871 provides the physical serial interface between RS-485\/RS-422 devices and a compatible NI system.\n<\/p>\n<p>\nA simplified communication path is:\n<\/p>\n<p>\n<strong>Industrial Device \u2192 RS-485 \/ RS-422 \u2192 NI-9871 \u2192 C Series System \u2192 Application Software<\/strong>\n<\/p>\n<p>\nThe host or real-time application can transmit commands to connected equipment and receive serial data for monitoring, processing, logging, or control.\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 automation and instrumentation.\n<\/p>\n<p>\nCompared with RS-232, RS-485 is particularly useful when applications require:\n<\/p>\n<ul>\n<li>Longer communication distances<\/li>\n<li>Better electrical noise immunity<\/li>\n<li>Multidrop network architectures<\/li>\n<li>Industrial environmental operation<\/li>\n<li>Communication between distributed devices<\/li>\n<\/ul>\n<h3>What Is RS-422?<\/h3>\n<p>\n<strong>RS-422<\/strong> is another differential serial communication standard.\n<\/p>\n<p>\nRS-422 commonly uses separate transmit and receive differential pairs and is suitable for high-speed, long-distance serial communication.\n<\/p>\n<p>\nBecause the NI-9871 supports both RS-485 and RS-422, it can be used with a broad range of industrial serial equipment.\n<\/p>\n<h3>RS-485 2-Wire vs 4-Wire<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>2-Wire RS-485<\/th>\n<th>4-Wire RS-485<\/th>\n<\/tr>\n<tr>\n<td>Data Pairs<\/td>\n<td>1 Differential Pair<\/td>\n<td>2 Differential Pairs<\/td>\n<\/tr>\n<tr>\n<td>Transmit \/ Receive<\/td>\n<td>Shared Pair<\/td>\n<td>Separate Pairs<\/td>\n<\/tr>\n<tr>\n<td>Typical Duplex Mode<\/td>\n<td>Half-Duplex<\/td>\n<td>Full-Duplex<\/td>\n<\/tr>\n<tr>\n<td>Wiring Complexity<\/td>\n<td>Lower<\/td>\n<td>Higher<\/td>\n<\/tr>\n<tr>\n<td>NI-9871 Support<\/td>\n<td>\u0414\u0430<\/td>\n<td>\u0414\u0430<\/td>\n<\/tr>\n<\/table>\n<h3>RS-485 2-Wire Wiring<\/h3>\n<p>\nFor a basic 2-wire RS-485 connection, NI specifies that the transmit and receive pairs must be joined externally.\n<\/p>\n<table>\n<tr>\n<th>NI-9871 Signal<\/th>\n<th>RS-485 Device<\/th>\n<\/tr>\n<tr>\n<td>RX+ and TX+<\/td>\n<td>A \/ Data+<\/td>\n<\/tr>\n<tr>\n<td>RX- and TX-<\/td>\n<td>B \/ Data-<\/td>\n<\/tr>\n<tr>\n<td>GND<\/td>\n<td>GND<\/td>\n<\/tr>\n<\/table>\n<p>\nThe NI-9871 does <strong>not automatically short the RX and TX lines internally<\/strong> for 2-wire RS-485 operation. The appropriate pairs must therefore be connected externally.\n<\/p>\n<h3>RS-485 4-Wire and RS-422 Wiring<\/h3>\n<p>\nRS-422 and 4-wire RS-485 use similar differential wiring at the physical layer.\n<\/p>\n<table>\n<tr>\n<th>NI-9871<\/th>\n<th>Connected Device<\/th>\n<\/tr>\n<tr>\n<td>RX+<\/td>\n<td>TX+<\/td>\n<\/tr>\n<tr>\n<td>RX-<\/td>\n<td>TX-<\/td>\n<\/tr>\n<tr>\n<td>TX+<\/td>\n<td>RX+<\/td>\n<\/tr>\n<tr>\n<td>TX-<\/td>\n<td>RX-<\/td>\n<\/tr>\n<tr>\n<td>GND<\/td>\n<td>GND<\/td>\n<\/tr>\n<\/table>\n<h3>Maximum Baud Rate<\/h3>\n<p>\nThe maximum NI-9871 baud rate is <strong>3.6864 Mbps<\/strong>.\n<\/p>\n<p>\nThe module also supports configurable baud rates derived from its internal baud-rate generation architecture.\n<\/p>\n<p>\nWhen a device requires an unusual or non-standard baud rate, verify that the actual baud rate generated by the NI-9871 is within the acceptable tolerance of the connected equipment.\n<\/p>\n<h3>Maximum Cable Length<\/h3>\n<p>\nNI specifies a maximum NI-9871 cable length of approximately <strong>1.2 km (4,000 ft)<\/strong>.\n<\/p>\n<p>\nActual reliable communication distance can depend on:\n<\/p>\n<ul>\n<li>Baud rate<\/li>\n<li>Cable characteristics<\/li>\n<li>Termination<\/li>\n<li>Network topology<\/li>\n<li>Electrical noise<\/li>\n<li>Grounding<\/li>\n<li>Number of connected devices<\/li>\n<\/ul>\n<h3>NI-9871 for Industrial Automation<\/h3>\n<p>\nRS-485 is widely used in industrial automation because it provides robust differential communication over relatively long cable distances.\n<\/p>\n<p>\nThe NI-9871 can interface with equipment such as:\n<\/p>\n<ul>\n<li>PLCs<\/li>\n<li>Industrial sensors<\/li>\n<li>Motor drives<\/li>\n<li>Motion controllers<\/li>\n<li>Remote I\/O<\/li>\n<li>Industrial instruments<\/li>\n<li>Machine controllers<\/li>\n<li>Data acquisition equipment<\/li>\n<\/ul>\n<h3>NI-9871 for Modbus RTU<\/h3>\n<p>\nThe NI-9871 provides an RS-485 physical interface that can be used in systems communicating with devices that implement <strong>Modbus RTU over RS-485<\/strong>.\n<\/p>\n<p>\nA typical architecture is:\n<\/p>\n<p>\n<strong>NI System \u2192 NI-9871 \u2192 RS-485 \u2192 Modbus RTU Device<\/strong>\n<\/p>\n<p>\nThe NI-9871 provides the serial physical interface, while the application software implements the required Modbus protocol communication.\n<\/p>\n<h3>Multi-Device RS-485 Networks<\/h3>\n<p>\nRS-485 can support multidrop network architectures where multiple devices share a differential communication bus.\n<\/p>\n<p>\nA simplified network can be:\n<\/p>\n<p>\n<strong>NI-9871 \u2192 RS-485 Bus \u2192 Device 1 \u2192 Device 2 \u2192 Device 3 \u2192 Device 4<\/strong>\n<\/p>\n<p>\nThe number of devices, termination requirements, addressing, and communication protocol depend on the specific RS-485 network design.\n<\/p>\n<h3>Machine Control Applications<\/h3>\n<p>\nThe NI-9871 can provide communication between an NI control system and serial machine components.\n<\/p>\n<p>\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:\n<\/p>\n<p>\n<strong>CompactRIO \u2192 NI-9871 \u2192 RS-485 \u2192 Motor Drive<\/strong>\n<\/p>\n<p>\nThe control application can send commands to the drive and receive operating status or diagnostic information.\n<\/p>\n<h3>Distributed Sensor Networks<\/h3>\n<p>\nIndustrial sensors with RS-485 interfaces can be distributed across machinery, production lines, or facilities.\n<\/p>\n<p>\nThe long-distance capability and differential signaling of the NI-9871 make it suitable for collecting data from these distributed serial devices.\n<\/p>\n<h3>Automated Test Applications<\/h3>\n<p>\nThe NI-9871 can be integrated into automated test systems where instruments or DUTs communicate through RS-485 or RS-422.\n<\/p>\n<p>\nA typical automated test sequence may:\n<\/p>\n<ol>\n<li>Initialize the NI-9871 port.<\/li>\n<li>Configure serial communication parameters.<\/li>\n<li>Establish communication with the DUT.<\/li>\n<li>Transmit a test command.<\/li>\n<li>Receive the DUT response.<\/li>\n<li>Acquire related analog or digital measurements.<\/li>\n<li>Compare the results against test limits.<\/li>\n<li>Record the test result.<\/li>\n<\/ol>\n<h3>CompactRIO Applications<\/h3>\n<p>\nThe NI-9871 is particularly suited for integration into compatible <strong>CompactRIO<\/strong> systems.\n<\/p>\n<p>\nA CompactRIO architecture can combine:\n<\/p>\n<ul>\n<li>RS-485 communication<\/li>\n<li>RS-422 communication<\/li>\n<li>Real-time processing<\/li>\n<li>FPGA-based control<\/li>\n<li>Analog measurement<\/li>\n<li>\u0426\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u0432\u0432\u043e\u0434-\u0432\u044b\u0432\u043e\u0434<\/li>\n<li>Industrial sensor measurement<\/li>\n<\/ul>\n<p>\nThis combination makes the NI-9871 useful for embedded machine control, distributed measurement, industrial automation, and real-time test applications.\n<\/p>\n<h3>LabVIEW FPGA Integration<\/h3>\n<p>\nThe NI-9871 can be accessed through compatible <strong>LabVIEW FPGA<\/strong> architectures in CompactRIO systems.\n<\/p>\n<p>\nDirect FPGA access provides flexibility for applications requiring custom serial communication behavior or close integration between communication and FPGA-based I\/O.\n<\/p>\n<p>\nA typical architecture is:\n<\/p>\n<p>\n<strong>RS-485 Device \u2192 NI-9871 \u2192 FPGA \u2192 Real-Time Controller \u2192 Application<\/strong>\n<\/p>\n<h3>NI-9871 vs NI-9870<\/h3>\n<p>\nThe NI-9871 and NI-9870 are closely related four-port C Series serial interface modules, but they support different electrical serial standards.\n<\/p>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>NI-9871<\/th>\n<th>NI-9870<\/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>4<\/td>\n<td>4<\/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>3.6864 Mbps<\/strong><\/td>\n<td>921.6 kbit\/s<\/td>\n<\/tr>\n<tr>\n<td>Maximum Cable Length<\/td>\n<td><strong>Up to 1.2 km<\/strong><\/td>\n<td>Shorter RS-232 Distances<\/td>\n<\/tr>\n<tr>\n<td>Multidrop Networks<\/td>\n<td><strong>Supported by RS-485<\/strong><\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<td>Typical Application<\/td>\n<td>Industrial \/ Distributed Communication<\/td>\n<td>Instrument \/ Point-to-Point Communication<\/td>\n<\/tr>\n<\/table>\n<p>\nChoose the NI-9871 for RS-485 or RS-422 equipment. Choose the NI-9870 when the connected equipment requires RS-232.\n<\/p>\n<h3>NI-9871 vs RS-232 Serial Modules<\/h3>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>NI-9871 RS-485\/422<\/th>\n<th>RS-232 Interface<\/th>\n<\/tr>\n<tr>\n<td>Electrical Signaling<\/td>\n<td>Differential<\/td>\n<td>Single-Ended<\/td>\n<\/tr>\n<tr>\n<td>Noise Immunity<\/td>\n<td><strong>Higher<\/strong><\/td>\n<td>Lower<\/td>\n<\/tr>\n<tr>\n<td>Cable Distance<\/td>\n<td><strong>Longer<\/strong><\/td>\n<td>Shorter<\/td>\n<\/tr>\n<tr>\n<td>Multidrop<\/td>\n<td><strong>Available with RS-485<\/strong><\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<td>Industrial Networks<\/td>\n<td><strong>Well Suited<\/strong><\/td>\n<td>Application Dependent<\/td>\n<\/tr>\n<\/table>\n<h3>Termination Considerations<\/h3>\n<p>\nLong RS-485 and RS-422 networks may require appropriate termination to maintain signal integrity and reduce reflections.\n<\/p>\n<p>\nTermination requirements depend on:\n<\/p>\n<ul>\n<li>Cable impedance<\/li>\n<li>Network length<\/li>\n<li>Baud rate<\/li>\n<li>Network topology<\/li>\n<li>Number of devices<\/li>\n<\/ul>\n<p>\nAlways follow the requirements of the connected equipment and the complete network design when selecting termination.\n<\/p>\n<h3>Grounding Considerations<\/h3>\n<p>\nCorrect grounding is important for reliable RS-485 and RS-422 communication.\n<\/p>\n<p>\nEven though communication uses differential signaling, the reference potential between connected devices must remain within the allowable electrical limits of the transceivers.\n<\/p>\n<p>\nVerify the grounding requirements of both the NI-9871 and connected equipment before installation.\n<\/p>\n<h3>Serial Communication Configuration<\/h3>\n<p>\nThe NI-9871 serial parameters must match the connected device.\n<\/p>\n<p>\nTypical settings include:\n<\/p>\n<ul>\n<li>Baud rate<\/li>\n<li>Data bits<\/li>\n<li>Stop bits<\/li>\n<li>Parity<\/li>\n<li>Flow control<\/li>\n<li>RS-485 wire mode<\/li>\n<li>Communication timeout<\/li>\n<li>Protocol-specific settings<\/li>\n<\/ul>\n<h3>Troubleshooting NI-9871 Communication<\/h3>\n<p>\nIf the NI-9871 cannot communicate with an RS-485 or RS-422 device, check the complete system configuration.\n<\/p>\n<ol>\n<li>Verify that the NI-9871 is recognized by the host system.<\/li>\n<li>Confirm that the module is installed in a compatible chassis.<\/li>\n<li>Verify the 8\u201328 VDC external power supply.<\/li>\n<li>Check the RJ50 cable and connector wiring.<\/li>\n<li>Confirm whether the device uses RS-485 or RS-422.<\/li>\n<li>Determine whether RS-485 uses 2-wire or 4-wire operation.<\/li>\n<li>For 2-wire RS-485, verify that RX and TX pairs are connected correctly.<\/li>\n<li>Check Data+ and Data- polarity.<\/li>\n<li>Verify baud rate.<\/li>\n<li>Check data bits, parity, and stop bits.<\/li>\n<li>Verify termination and network topology.<\/li>\n<li>Check grounding.<\/li>\n<li>Confirm the application protocol and device address.<\/li>\n<\/ol>\n<h3>How to Choose a C Series Serial Interface<\/h3>\n<p>\nBefore selecting the NI-9871, determine:\n<\/p>\n<ul>\n<li>Required serial standard<\/li>\n<li>RS-232, RS-485, or RS-422<\/li>\n<li>2-wire or 4-wire RS-485 requirement<\/li>\n<li>Required number of serial ports<\/li>\n<li>Required baud rate<\/li>\n<li>Required cable distance<\/li>\n<li>Multidrop network requirements<\/li>\n<li>Flow-control requirements<\/li>\n<li>External power availability<\/li>\n<li>CompactRIO compatibility<\/li>\n<li>FPGA integration requirements<\/li>\n<li>Application software compatibility<\/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>Manufacturing<\/li>\n<li>Machine Control<\/li>\n<li>Energy<\/li>\n<li>Transportation<\/li>\n<li>Automated Test<\/li>\n<li>Laboratory Automation<\/li>\n<li>Embedded Systems<\/li>\n<li>Research and Development<\/li>\n<li>Industrial Instrumentation<\/li>\n<\/ul>\n<h3>Applications<\/h3>\n<h4>RS-485 Communication<\/h4>\n<p>\nThe NI-9871 provides four differential serial interfaces for communicating with RS-485 industrial equipment.\n<\/p>\n<h4>RS-422 Communication<\/h4>\n<p>\nRS-422 devices can be connected to the NI-9871 for reliable differential point-to-point serial communication.\n<\/p>\n<h4>Modbus RTU Communication<\/h4>\n<p>\nThe NI-9871 can provide the RS-485 physical interface for compatible Modbus RTU systems when the required protocol is implemented in software.\n<\/p>\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 module can connect CompactRIO systems to industrial controllers, sensors, motor drives, remote I\/O, and other serial equipment.\n<\/p>\n<h4>Machine Control<\/h4>\n<p>\nRS-485 or RS-422 machine components can exchange commands, operating data, and diagnostic information with an NI control system through the NI-9871.\n<\/p>\n<h4>Distributed Measurement<\/h4>\n<p>\nThe long-distance capability of RS-485 makes the NI-9871 suitable for communicating with distributed sensors and instruments.\n<\/p>\n<h4>Automated Test<\/h4>\n<p>\nAutomated test systems can communicate with RS-485\/RS-422 DUTs while simultaneously acquiring other analog and digital measurements.\n<\/p>\n<h3>Recommended Related Products<\/h3>\n<table>\n<tr>\n<td width=\"220\"><strong>NI-9871<\/strong><\/td>\n<td>4-port C Series RS-485\/RS-422 serial interface module for industrial and embedded communication.<\/td>\n<\/tr>\n<tr>\n<td><strong>NI-9870<\/strong><\/td>\n<td>4-port C Series RS-232 serial interface module for point-to-point serial instrument communication.<\/td>\n<\/tr>\n<tr>\n<td><strong>NI-9866<\/strong><\/td>\n<td>C Series LIN interface module for automotive and embedded network communication.<\/td>\n<\/tr>\n<tr>\n<td><strong>NI-9862<\/strong><\/td>\n<td>C Series CAN interface module for automotive and embedded CAN network applications.<\/td>\n<\/tr>\n<\/table>\n<h3>Why Choose NI-9871?<\/h3>\n<ul>\n<li>4 independent serial ports<\/li>\n<li>RS-485 support<\/li>\n<li>RS-422 support<\/li>\n<li>2-wire RS-485 support<\/li>\n<li>4-wire RS-485 support<\/li>\n<li>Up to 3.6864 Mbps<\/li>\n<li>Up to 1.2 km cable length<\/li>\n<li>Differential signaling<\/li>\n<li>High noise immunity<\/li>\n<li>Suitable for multidrop RS-485 networks<\/li>\n<li>\u00b115 kV data-line ESD protection<\/li>\n<li>8\u201328 VDC external power<\/li>\n<li>Wide industrial operating temperature range<\/li>\n<li>CompactRIO integration<\/li>\n<li>LabVIEW FPGA integration<\/li>\n<li>Suitable for industrial automation<\/li>\n<li>Suitable for Modbus RTU physical-layer communication<\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What is the NI-9871?<\/h4>\n<p>\nThe NI-9871 is a <strong>4-port C Series RS-485\/RS-422 serial interface module<\/strong> designed for industrial, embedded, and automated test applications.\n<\/p>\n<h4>How many serial ports does NI-9871 have?<\/h4>\n<p>\nThe NI-9871 provides <strong>four independent RS-485\/RS-422 serial ports<\/strong>.\n<\/p>\n<h4>What serial standards does NI-9871 support?<\/h4>\n<p>\nThe NI-9871 supports <strong>RS-485 and RS-422<\/strong> differential serial communication.\n<\/p>\n<h4>What is the maximum baud rate of NI-9871?<\/h4>\n<p>\nThe NI-9871 supports a maximum baud rate of <strong>3.6864 Mbps<\/strong>.\n<\/p>\n<h4>What is the maximum cable length of NI-9871?<\/h4>\n<p>\nNI specifies a maximum cable length of approximately <strong>1.2 km (4,000 ft)<\/strong>. Actual system performance depends on cable characteristics, baud rate, termination, topology, grounding, and environmental conditions.\n<\/p>\n<h4>Does NI-9871 support 2-wire RS-485?<\/h4>\n<p>\nYes. For 2-wire RS-485 operation, the NI-9871 RX+ and TX+ lines are connected together to Data+, while RX- and TX- are connected together to Data-. The module does not automatically make these connections internally.\n<\/p>\n<h4>Does NI-9871 support 4-wire RS-485?<\/h4>\n<p>\nYes. The NI-9871 supports 4-wire RS-485 using separate differential transmit and receive pairs.\n<\/p>\n<h4>Does NI-9871 support RS-422?<\/h4>\n<p>\nYes. RS-422 is one of the primary serial standards supported by the NI-9871.\n<\/p>\n<h4>What connector does NI-9871 use?<\/h4>\n<p>\nThe NI-9871 provides <strong>four RJ50 serial connectors<\/strong>. Appropriate cables or adapters can be used when connecting equipment with DB9 or terminal-style interfaces.\n<\/p>\n<h4>Does NI-9871 require external power?<\/h4>\n<p>\nYes. The NI-9871 requires an external supply of approximately <strong>8 VDC to 28 VDC<\/strong> for operation of its serial transceivers.\n<\/p>\n<h4>Can NI-9871 communicate with Modbus RTU devices?<\/h4>\n<p>\nYes, when the Modbus RTU device uses a compatible RS-485 physical interface. The NI-9871 provides the serial physical layer, while the Modbus protocol must be implemented by the application software.\n<\/p>\n<h4>Can NI-9871 communicate with multiple RS-485 devices?<\/h4>\n<p>\nRS-485 supports multidrop network architectures, so multiple compatible devices can share a properly designed RS-485 bus. Device addressing and communication behavior are controlled by the protocol used by the application.\n<\/p>\n<h4>What is the difference between NI-9871 and NI-9870?<\/h4>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>NI-9871 supports RS-485\/RS-422<\/strong>, while the <strong>NI-9870 supports RS-232<\/strong>. The NI-9871 is better suited to longer-distance, differential, and multidrop industrial communication.\n<\/p>\n<h4>Can NI-9871 be used for long-distance serial communication?<\/h4>\n<p>\nYes. NI specifies cable lengths up to approximately 1.2 km (4,000 ft), making the NI-9871 suitable for many distributed industrial communication systems.\n<\/p>\n<h4>Can NI-9871 be used with CompactRIO?<\/h4>\n<p>\nYes. CompactRIO is a primary platform for the NI-9871, allowing RS-485\/RS-422 communication to be integrated with real-time processing, FPGA functionality, and other C Series I\/O.\n<\/p>\n<h4>Can NI-9871 be used with LabVIEW FPGA?<\/h4>\n<p>\nYes. Compatible CompactRIO configurations can access the NI-9871 through LabVIEW FPGA, providing flexible control of serial communication.\n<\/p>\n<h4>Why is my NI-9871 not communicating?<\/h4>\n<p>\nCommon causes include missing external power, incorrect RS-485\/RS-422 configuration, incorrect Data+\/Data- polarity, improper 2-wire RX\/TX connections, incorrect baud rate, mismatched parity or stop bits, improper termination, grounding problems, incorrect device addressing, or incompatible software configuration.\n<\/p>\n<h4>What should I check before purchasing NI-9871?<\/h4>\n<p>\nVerify whether the target equipment uses RS-485 or RS-422, whether RS-485 communication is 2-wire or 4-wire, the required baud rate, number of ports, cable length, termination requirements, external power supply, RJ50 cable requirements, CompactRIO compatibility, software environment, and the exact NI part number.\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-9871 4-Port C Series RS-485\/RS-422 Serial Interface Module<\/strong> provides four differential serial interfaces, communication rates up to 3.6864 Mbps, support for 2-wire and 4-wire RS-485 as well as RS-422, and cable lengths up to 1.2 km. It is particularly well suited for CompactRIO-based industrial automation, machine control, distributed instrumentation, Modbus RTU communication, automated test, and embedded serial communication systems.<\/p>","protected":false},"excerpt":{"rendered":"<p>\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<br \/>\n\u0412 \u043a\u043e\u043c\u043f\u043b\u0435\u043a\u0442 \u0432\u0445\u043e\u0434\u0438\u0442: \u0414\u0430<br \/>\nSupported Hardware Platform: CompactRIO<br \/>\nMaximum Baud Rate: 3.68 Mbits\/s<\/p>","protected":false},"featured_media":31099,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[673],"product_tag":[],"class_list":["post-29622","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-c-module","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-9871 C Series Serial Interface Module 779892-02, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"NI-9871 is a 4-port C Series RS-485\/RS-422 serial interface module with up to 3.6864 Mbps communication for CompactRIO industrial and embedded systems.\" \/>\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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