{"id":29617,"date":"2025-09-18T10:27:54","date_gmt":"2025-09-18T02:27:54","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=29617"},"modified":"2026-08-27T20:36:19","modified_gmt":"2026-08-27T12:36:19","slug":"ni-9870","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/ni-9870\/","title":{"rendered":"NI-9870"},"content":{"rendered":"<h3>Product Introduction<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>NI-9870<\/strong> \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f <strong>4-port C Series RS-232 serial interface module<\/strong> designed for connecting RS-232 serial devices to compatible NI CompactDAQ and CompactRIO systems.\n<\/p>\n<p>\nWith four independent RS-232 ports in a single C Series module, the NI-9870 is suitable for industrial communication, automated test, embedded control, laboratory automation, machine integration, instrument communication, and serial device monitoring applications.\n<\/p>\n<p>\nThe module enables engineers to integrate serial communication with analog input, analog output, digital I\/O, sensor measurement, and other C Series functions within a modular test or control system.\n<\/p>\n<h3>Product Overview<\/h3>\n<p>\n\u0417\u0435\u043c\u043b\u044f <strong>National Instruments NI-9870<\/strong> belongs to the NI C Series serial interface family and provides <strong>four RS-232 serial communication ports<\/strong>.\n<\/p>\n<p>\nA typical system architecture is:\n<\/p>\n<p>\n<strong>RS-232 Devices \u2192 NI-9870 \u2192 CompactDAQ \/ CompactRIO \u2192 Application Software<\/strong>\n<\/p>\n<p>\nThe module is useful when multiple serial devices must be connected to the same measurement, automation, or embedded control platform.\n<\/p>\n<h3>Key Features<\/h3>\n<h4>4 RS-232 Serial Ports<\/h4>\n<p>\nThe NI-9870 provides <strong>four independent RS-232 serial communication ports<\/strong>.\n<\/p>\n<p>\nMultiple ports allow several serial devices to communicate with the host system through a single C Series module.\n<\/p>\n<p>\nTypical connected equipment can include:\n<\/p>\n<ul>\n<li>Industrial instruments<\/li>\n<li>Barcode scanners<\/li>\n<li>Serial sensors<\/li>\n<li>GPS receivers<\/li>\n<li>Measurement instruments<\/li>\n<li>Motor controllers<\/li>\n<li>Embedded controllers<\/li>\n<li>Laboratory equipment<\/li>\n<li>Legacy RS-232 devices<\/li>\n<\/ul>\n<h4>RS-232 Communication<\/h4>\n<p>\nThe NI-9870 is specifically designed for <strong>RS-232 serial communication<\/strong>.\n<\/p>\n<p>\nRS-232 remains widely used in industrial equipment, laboratory instruments, embedded systems, and legacy devices because of its simple point-to-point communication architecture.\n<\/p>\n<p>\nA typical connection is:\n<\/p>\n<p>\n<strong>RS-232 Device \u2194 NI-9870 \u2194 NI Chassis \u2194 Application Software<\/strong>\n<\/p>\n<h4>Independent Serial Interfaces<\/h4>\n<p>\nEach NI-9870 port can communicate with an individual RS-232 device.\n<\/p>\n<p>\nThis allows one module to interface with multiple devices in a test or automation system without requiring several separate USB-to-serial adapters.\n<\/p>\n<p>\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:\n<\/p>\n<p>\n<strong>Port 1 \u2192 Measurement Instrument<\/strong><br \/>\n<strong>Port 2 \u2192 Barcode Scanner<\/strong><br \/>\n<strong>Port 3 \u2192 Motor Controller<\/strong><br \/>\n<strong>Port 4 \u2192 Serial Sensor<\/strong>\n<\/p>\n<h4>Standard Serial Communication Parameters<\/h4>\n<p>\nThe NI-9870 supports configurable serial communication parameters required for communication with different RS-232 devices.\n<\/p>\n<p>\nTypical configuration parameters 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<\/ul>\n<p>\nThese parameters should be configured to match the communication settings of the connected serial device.\n<\/p>\n<h4>Hardware Handshaking Support<\/h4>\n<p>\nThe NI-9870 supports standard RS-232 modem and handshaking signals, allowing it to communicate with devices that require more than basic transmit and receive lines.\n<\/p>\n<p>\nDepending on the application, supported serial signals can be used for hardware flow control and device-status communication.\n<\/p>\n<h4>C Series Form Factor<\/h4>\n<p>\nThe NI-9870 uses the compact <strong>C Series<\/strong> module format.\n<\/p>\n<p>\nThis allows serial communication to be integrated with other C Series measurement and control functions in the same system.\n<\/p>\n<p>\nA system could combine:\n<\/p>\n<ul>\n<li>RS-232 communication<\/li>\n<li>Analog voltage measurement<\/li>\n<li>\u0418\u0437\u043c\u0435\u0440\u0435\u043d\u0438\u0435 \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u044b<\/li>\n<li>\u0426\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u0432\u0432\u043e\u0434-\u0432\u044b\u0432\u043e\u0434<\/li>\n<li>Relay control<\/li>\n<li>Current measurement<\/li>\n<li>Industrial communication<\/li>\n<\/ul>\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-9870<\/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 Interface<\/td>\n<td>\u0420\u0421-232<\/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>Asynchronous Serial<\/td>\n<\/tr>\n<tr>\n<td>Maximum Baud Rate<\/td>\n<td>921.6 kbit\/s<\/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>Parity<\/td>\n<td>Odd, Even, Mark, Space, None<\/td>\n<\/tr>\n<tr>\n<td>Flow Control<\/td>\n<td>RTS\/CTS, XON\/XOFF and Other Supported Serial Configurations<\/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>Connectors<\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>External Power<\/td>\n<td>Required<\/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>Compatible Platforms<\/td>\n<td>Supported CompactDAQ and CompactRIO Systems<\/td>\n<\/tr>\n<tr>\n<td>Primary Applications<\/td>\n<td>Serial Communication, Industrial Automation, Instrument Control and Embedded Systems<\/td>\n<\/tr>\n<\/table>\n<h3>NI-9870 Part Number<\/h3>\n<p>\nWhen purchasing or replacing an NI-9870, use the complete National Instruments model and part number to verify the exact hardware configuration.\n<\/p>\n<p>\nDifferent production revisions or environmental configurations may exist, so the complete part number printed on the module should be confirmed before ordering.\n<\/p>\n<h3>How Does the NI-9870 Work?<\/h3>\n<p>\nThe NI-9870 provides the physical and communication interface between RS-232 devices and a compatible NI C Series system.\n<\/p>\n<p>\nA simplified communication path is:\n<\/p>\n<p>\n<strong>Serial Device \u2192 RS-232 \u2192 NI-9870 \u2192 C Series Chassis \u2192 Host \/ Real-Time Application<\/strong>\n<\/p>\n<p>\nApplication software can transmit commands to the connected device and receive serial responses for processing, monitoring, logging, or control.\n<\/p>\n<h3>What Is RS-232?<\/h3>\n<p>\n<strong>\u0420\u0421-232<\/strong> is a serial communication standard commonly used for point-to-point communication between electronic devices.\n<\/p>\n<p>\nRS-232 communication typically uses separate transmit and receive signals and can also include hardware handshaking lines.\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>Instrument control<\/li>\n<li>Industrial equipment communication<\/li>\n<li>Embedded device configuration<\/li>\n<li>Barcode scanning<\/li>\n<li>Laboratory automation<\/li>\n<li>\u0423\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043c\u0430\u0448\u0438\u043d\u043e\u0439<\/li>\n<li>Legacy equipment integration<\/li>\n<\/ul>\n<h3>RS-232 Point-to-Point Communication<\/h3>\n<p>\nRS-232 is primarily designed for <strong>point-to-point communication<\/strong>.\n<\/p>\n<p>\nEach NI-9870 port normally communicates directly with one RS-232 device.\n<\/p>\n<p>\nA four-device architecture can therefore be:\n<\/p>\n<p>\n<strong>Device A \u2194 Port 1<\/strong><br \/>\n<strong>Device B \u2194 Port 2<\/strong><br \/>\n<strong>Device C \u2194 Port 3<\/strong><br \/>\n<strong>Device D \u2194 Port 4<\/strong>\n<\/p>\n<p>\nIf the application requires multidrop communication between multiple devices on a shared bus, an RS-485 interface may be more appropriate.\n<\/p>\n<h3>Maximum Baud Rate<\/h3>\n<p>\nThe NI-9870 supports serial communication rates up to <strong>921.6 kbit\/s<\/strong>.\n<\/p>\n<p>\nThe actual baud rate used in an application must match the communication capabilities and configuration of the connected RS-232 device.\n<\/p>\n<p>\nCommon serial rates include:\n<\/p>\n<ul>\n<li>9,600 bit\/s<\/li>\n<li>19,200 bit\/s<\/li>\n<li>38,400 bit\/s<\/li>\n<li>57,600 bit\/s<\/li>\n<li>115,200 bit\/s<\/li>\n<li>Higher supported rates up to 921.6 kbit\/s<\/li>\n<\/ul>\n<h3>RJ50 Connectivity<\/h3>\n<p>\nThe NI-9870 uses <strong>RJ50 connectors<\/strong> for its four RS-232 ports.\n<\/p>\n<p>\nThis is important when replacing conventional PC serial interfaces because many traditional RS-232 devices use DB9 connectors.\n<\/p>\n<p>\nAn appropriate NI serial cable or correctly wired adapter may therefore be required between the NI-9870 and a DB9-equipped serial device.\n<\/p>\n<p>\nAlways verify the NI-9870 pinout and the connected device pinout before wiring the system.\n<\/p>\n<h3>External Power Requirement<\/h3>\n<p>\nThe NI-9870 requires an appropriate <strong>external power supply<\/strong> for operation of its serial transceivers.\n<\/p>\n<p>\nWhen integrating the module, verify:\n<\/p>\n<ul>\n<li>External supply voltage<\/li>\n<li>Power wiring<\/li>\n<li>Ground connection<\/li>\n<li>Module pinout<\/li>\n<li>Chassis compatibility<\/li>\n<\/ul>\n<p>\nFailure to provide the required external power can prevent the serial ports from communicating correctly.\n<\/p>\n<h3>NI-9870 for Instrument Control<\/h3>\n<p>\nMany laboratory and industrial instruments continue to provide RS-232 communication ports.\n<\/p>\n<p>\nThe NI-9870 can be used to send commands to these instruments and receive measurement or status information.\n<\/p>\n<p>\nA typical architecture is:\n<\/p>\n<p>\n<strong>Test Application \u2192 NI-9870 \u2192 RS-232 \u2192 Instrument<\/strong>\n<\/p>\n<p>\nThis allows serial instrument control to be incorporated into a larger automated measurement system.\n<\/p>\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>\nThe NI-9870 is useful for industrial systems containing equipment that communicates through RS-232.\n<\/p>\n<p>\nExamples include:\n<\/p>\n<ul>\n<li>Machine controllers<\/li>\n<li>Serial sensors<\/li>\n<li>Barcode readers<\/li>\n<li>Weighing systems<\/li>\n<li>Motor drives<\/li>\n<li>Industrial displays<\/li>\n<li>Legacy PLC interfaces<\/li>\n<li>Measurement equipment<\/li>\n<\/ul>\n<h3>Automated Test Applications<\/h3>\n<p>\nThe NI-9870 can be incorporated into automated test systems where one or more DUTs or instruments require serial communication.\n<\/p>\n<p>\nA typical automated sequence may:\n<\/p>\n<ol>\n<li>Initialize the NI-9870 serial port.<\/li>\n<li>Configure baud rate and communication parameters.<\/li>\n<li>Open communication with the DUT.<\/li>\n<li>Transmit a test command.<\/li>\n<li>Receive the DUT response.<\/li>\n<li>Acquire related physical measurements.<\/li>\n<li>Compare results with test limits.<\/li>\n<li>Record the result.<\/li>\n<\/ol>\n<h3>Embedded Control Applications<\/h3>\n<p>\nWhen used with a compatible CompactRIO system, the NI-9870 can provide serial communication for embedded control applications.\n<\/p>\n<p>\nThe CompactRIO controller can exchange commands and data with external RS-232 equipment while simultaneously performing real-time measurement and control.\n<\/p>\n<p>\nA typical architecture is:\n<\/p>\n<p>\n<strong>RS-232 Devices \u2192 NI-9870 \u2192 CompactRIO \u2192 Real-Time Application \u2192 Control \/ Logging<\/strong>\n<\/p>\n<h3>CompactDAQ Applications<\/h3>\n<p>\nThe NI-9870 can be used with supported <strong>\u041a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u044b\u0439 \u0426\u0410\u041f<\/strong> configurations for PC-based serial communication and measurement applications.\n<\/p>\n<p>\nA CompactDAQ system can combine serial communication with other C Series modules for:\n<\/p>\n<ul>\n<li>Voltage measurement<\/li>\n<li>Current measurement<\/li>\n<li>Temperature acquisition<\/li>\n<li>Digital monitoring<\/li>\n<li>Relay control<\/li>\n<li>Sensor measurement<\/li>\n<\/ul>\n<p>\nAlways verify compatibility with the exact CompactDAQ chassis and software environment before purchasing.\n<\/p>\n<h3>CompactRIO Applications<\/h3>\n<p>\nThe NI-9870 is commonly integrated into <strong>CompactRIO<\/strong> systems requiring serial communication with industrial or embedded equipment.\n<\/p>\n<p>\nCompactRIO provides a modular architecture that can combine:\n<\/p>\n<ul>\n<li>Real-time processing<\/li>\n<li>FPGA-based I\/O<\/li>\n<li>RS-232 communication<\/li>\n<li>Analog measurement<\/li>\n<li>Digital control<\/li>\n<li>Industrial communication<\/li>\n<\/ul>\n<h3>LabVIEW Integration<\/h3>\n<p>\nThe NI-9870 can be integrated into compatible <strong>\u041b\u0430\u0431\u0412\u044c\u044e<\/strong> applications for serial device communication.\n<\/p>\n<p>\nA typical software workflow is:\n<\/p>\n<p>\n<strong>Configure Serial Port \u2192 Open Communication \u2192 Write Command \u2192 Read Response \u2192 Parse Data \u2192 Display \/ Log \/ Control<\/strong>\n<\/p>\n<p>\nThis makes the module suitable for automated test, laboratory automation, industrial control, and embedded applications.\n<\/p>\n<h3>Serial Device Command and Response<\/h3>\n<p>\nMany RS-232 devices operate using a command-and-response protocol.\n<\/p>\n<p>\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440:\n<\/p>\n<p>\n<strong>Host \u2192 Measurement Request \u2192 Serial Device<\/strong><br \/>\n<strong>Serial Device \u2192 Measurement Result \u2192 Host<\/strong>\n<\/p>\n<p>\nThe NI-9870 provides the communication interface while the application software handles the device-specific protocol.\n<\/p>\n<h3>NI-9870 vs NI-9871<\/h3>\n<p>\nThe NI-9870 and NI-9871 are closely related C Series serial interface modules, but they support different physical-layer standards.\n<\/p>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>NI-9870<\/th>\n<th>NI-9871<\/th>\n<\/tr>\n<tr>\n<td>Serial Standard<\/td>\n<td><strong>\u0420\u0421-232<\/strong><\/td>\n<td>RS-422 \/ RS-485<\/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>Primary Network Type<\/td>\n<td>Point-to-Point<\/td>\n<td>Point-to-Point \/ Multidrop<\/td>\n<\/tr>\n<tr>\n<td>Typical Cable Distance<\/td>\n<td>Shorter<\/td>\n<td><strong>Longer<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Noise Immunity<\/td>\n<td>Standard<\/td>\n<td><strong>Higher<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Typical Application<\/td>\n<td>RS-232 Instruments and Devices<\/td>\n<td>Industrial RS-485 \/ RS-422 Networks<\/td>\n<\/tr>\n<\/table>\n<p>\nChoose the NI-9870 for RS-232 devices. Choose the NI-9871 when the equipment requires RS-422 or RS-485 communication.\n<\/p>\n<h3>RS-232 vs RS-485<\/h3>\n<p>\nRS-232 and RS-485 are both serial communication standards, but their electrical architectures differ significantly.\n<\/p>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>\u0420\u0421-232<\/th>\n<th>RS-485<\/th>\n<\/tr>\n<tr>\n<td>Typical Topology<\/td>\n<td>Point-to-Point<\/td>\n<td>Multidrop<\/td>\n<\/tr>\n<tr>\n<td>Signaling<\/td>\n<td>Single-Ended<\/td>\n<td>Differential<\/td>\n<\/tr>\n<tr>\n<td>Noise Immunity<\/td>\n<td>Lower<\/td>\n<td>Higher<\/td>\n<\/tr>\n<tr>\n<td>Typical Cable Distance<\/td>\n<td>Shorter<\/td>\n<td>Longer<\/td>\n<\/tr>\n<tr>\n<td>Multiple Devices on Bus<\/td>\n<td>No<\/td>\n<td>\u0414\u0430<\/td>\n<\/tr>\n<tr>\n<td>Recommended NI Module<\/td>\n<td><strong>NI-9870<\/strong><\/td>\n<td><strong>NI-9871<\/strong><\/td>\n<\/tr>\n<\/table>\n<h3>NI-9870 vs USB-to-Serial Adapters<\/h3>\n<p>\nA conventional USB-to-RS-232 adapter may be sufficient for simple desktop communication, while the NI-9870 is designed for integration into modular NI measurement and control systems.\n<\/p>\n<table>\n<tr>\n<th>\u0424\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\n<th>NI-9870<\/th>\n<th>Typical USB Serial Adapter<\/th>\n<\/tr>\n<tr>\n<td>Ports<\/td>\n<td><strong>4<\/strong><\/td>\n<td>Typically 1<\/td>\n<\/tr>\n<tr>\n<td>C Series Integration<\/td>\n<td><strong>\u0414\u0430<\/strong><\/td>\n<td>No<\/td>\n<\/tr>\n<tr>\n<td>CompactRIO Integration<\/td>\n<td><strong>\u0414\u0430<\/strong><\/td>\n<td>Limited \/ Application Dependent<\/td>\n<\/tr>\n<tr>\n<td>Industrial System Integration<\/td>\n<td><strong>Designed for Modular Systems<\/strong><\/td>\n<td>Primarily Desktop Use<\/td>\n<\/tr>\n<tr>\n<td>Other C Series I\/O Integration<\/td>\n<td><strong>\u0414\u0430<\/strong><\/td>\n<td>No<\/td>\n<\/tr>\n<\/table>\n<h3>Legacy Equipment Integration<\/h3>\n<p>\nOne important application for the NI-9870 is integrating older RS-232 equipment into modern measurement and automation systems.\n<\/p>\n<p>\nMany instruments and industrial devices remain operational for years and may provide only an RS-232 communication interface.\n<\/p>\n<p>\nThe NI-9870 allows these devices to be incorporated into a modern CompactDAQ or CompactRIO architecture without replacing the original equipment solely because of its communication interface.\n<\/p>\n<h3>Multi-Device Serial Communication<\/h3>\n<p>\nBecause the NI-9870 provides four ports, one C Series slot can support multiple RS-232 devices.\n<\/p>\n<table>\n<tr>\n<th>NI-9870 Port<\/th>\n<th>Example Device<\/th>\n<\/tr>\n<tr>\n<td>Port 1<\/td>\n<td>Power Supply<\/td>\n<\/tr>\n<tr>\n<td>Port 2<\/td>\n<td>Barcode Scanner<\/td>\n<\/tr>\n<tr>\n<td>Port 3<\/td>\n<td>Motor Controller<\/td>\n<\/tr>\n<tr>\n<td>Port 4<\/td>\n<td>Environmental Sensor<\/td>\n<\/tr>\n<\/table>\n<p>\nEach port can be configured according to the communication parameters required by its connected device.\n<\/p>\n<h3>Serial Communication Configuration<\/h3>\n<p>\nBefore communicating with an RS-232 device, configure the NI-9870 port to match the device settings.\n<\/p>\n<p>\nImportant parameters include:\n<\/p>\n<ul>\n<li>Baud rate<\/li>\n<li>Number of data bits<\/li>\n<li>Parity mode<\/li>\n<li>Number of stop bits<\/li>\n<li>Flow-control method<\/li>\n<li>Message termination character<\/li>\n<li>Communication timeout<\/li>\n<\/ul>\n<p>\nA mismatch in any of these parameters can cause communication errors or unreadable data.\n<\/p>\n<h3>RS-232 Wiring Considerations<\/h3>\n<p>\nCorrect wiring is essential when connecting equipment to the NI-9870.\n<\/p>\n<p>\nBefore connecting a serial device, verify:\n<\/p>\n<ul>\n<li>NI-9870 RJ50 pinout<\/li>\n<li>DUT connector pinout<\/li>\n<li>Transmit and receive connections<\/li>\n<li>Signal ground<\/li>\n<li>Required handshaking signals<\/li>\n<li>DTE or DCE configuration<\/li>\n<li>Cable type<\/li>\n<li>External power<\/li>\n<\/ul>\n<h3>DTE and DCE Considerations<\/h3>\n<p>\nTraditional RS-232 systems distinguish between <strong>DTE<\/strong> \u0438 <strong>DCE<\/strong> equipment.\n<\/p>\n<p>\nDepending on the connected device, a straight-through or crossover\/null-modem wiring arrangement may be required.\n<\/p>\n<p>\nAlways compare the NI-9870 pinout with the target device documentation rather than assuming that two serial connectors can be connected directly.\n<\/p>\n<h3>Troubleshooting NI-9870 Communication<\/h3>\n<p>\nIf the NI-9870 cannot communicate with an RS-232 device, check the complete hardware and software configuration.\n<\/p>\n<ol>\n<li>Verify that the NI-9870 is recognized by the system.<\/li>\n<li>Confirm that the module is installed in a supported chassis.<\/li>\n<li>Verify external power.<\/li>\n<li>Check the RJ50 cable and adapter.<\/li>\n<li>Confirm TX, RX, and ground wiring.<\/li>\n<li>Verify baud rate.<\/li>\n<li>Verify data bits.<\/li>\n<li>Check parity and stop bits.<\/li>\n<li>Verify hardware or software flow control.<\/li>\n<li>Check DTE\/DCE requirements.<\/li>\n<li>Verify message termination characters.<\/li>\n<li>Confirm the connected device is powered and operating correctly.<\/li>\n<\/ol>\n<h3>How to Choose a C Series Serial Interface<\/h3>\n<p>\nBefore selecting the NI-9870, determine:\n<\/p>\n<ul>\n<li>Required serial standard<\/li>\n<li>RS-232 or RS-422\/RS-485<\/li>\n<li>Required number of serial ports<\/li>\n<li>Required baud rate<\/li>\n<li>Flow-control requirements<\/li>\n<li>Connector and cable requirements<\/li>\n<li>External power requirements<\/li>\n<li>CompactDAQ or CompactRIO compatibility<\/li>\n<li>Real-time requirements<\/li>\n<li>Software and driver 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>Automated Test<\/li>\n<li>Manufacturing<\/li>\n<li>Laboratory Automation<\/li>\n<li>Research and Development<\/li>\n<li>Machine Control<\/li>\n<li>Transportation<\/li>\n<li>Energy<\/li>\n<li>Embedded Systems<\/li>\n<li>Electronic Validation<\/li>\n<\/ul>\n<h3>Applications<\/h3>\n<h4>RS-232 Device Communication<\/h4>\n<p>\nThe NI-9870 provides four RS-232 interfaces for communicating with serial instruments, sensors, controllers, and other compatible devices.\n<\/p>\n<h4>Instrument Control<\/h4>\n<p>\nLaboratory and industrial instruments equipped with RS-232 interfaces can be controlled from compatible NI systems using the NI-9870.\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 integrate legacy and modern serial devices into modular industrial measurement and automation systems.\n<\/p>\n<h4>Automated Test<\/h4>\n<p>\nTest systems can use the NI-9870 to send commands to DUTs and instruments and collect serial responses during automated test sequences.\n<\/p>\n<h4>Embedded Control<\/h4>\n<p>\nCompactRIO systems can use the NI-9870 to communicate with external RS-232 equipment while performing real-time measurement and control.\n<\/p>\n<h4>Legacy Device Integration<\/h4>\n<p>\nExisting RS-232 equipment can be integrated into newer CompactDAQ and CompactRIO systems without replacing functional legacy hardware.\n<\/p>\n<h3>Recommended Related Products<\/h3>\n<table>\n<tr>\n<td width=\"220\"><strong>NI-9870<\/strong><\/td>\n<td>4-port C Series RS-232 serial interface module for instrument control, automation, and embedded communication.<\/td>\n<\/tr>\n<tr>\n<td><strong>NI-9871<\/strong><\/td>\n<td>4-port C Series RS-422\/RS-485 serial interface module for longer-distance and multidrop industrial communication.<\/td>\n<\/tr>\n<tr>\n<td><strong>NI-9866<\/strong><\/td>\n<td>C Series LIN interface module for automotive and embedded Local Interconnect Network communication.<\/td>\n<\/tr>\n<tr>\n<td><strong>NI-9862<\/strong><\/td>\n<td>C Series CAN interface module for automotive, embedded, and ECU network testing.<\/td>\n<\/tr>\n<\/table>\n<h3>Why Choose NI-9870?<\/h3>\n<ul>\n<li>4 independent RS-232 ports<\/li>\n<li>Up to 921.6 kbit\/s serial communication<\/li>\n<li>C Series modular form factor<\/li>\n<li>Suitable for instrument control<\/li>\n<li>Suitable for industrial automation<\/li>\n<li>Suitable for automated test<\/li>\n<li>Suitable for embedded control<\/li>\n<li>Supports standard RS-232 communication parameters<\/li>\n<li>Supports serial handshaking<\/li>\n<li>RJ50 connectivity<\/li>\n<li>Wide industrial operating temperature range<\/li>\n<li>CompactRIO integration<\/li>\n<li>Supported CompactDAQ integration<\/li>\n<li>Can be combined with other C Series I\/O modules<\/li>\n<li>Useful for legacy serial equipment integration<\/li>\n<\/ul>\n<h3>Frequently Asked Questions<\/h3>\n<h4>What is the NI-9870?<\/h4>\n<p>\nThe NI-9870 is a <strong>4-port C Series RS-232 serial interface module<\/strong> for communicating with RS-232 instruments, sensors, controllers, and other serial devices.\n<\/p>\n<h4>How many serial ports does NI-9870 have?<\/h4>\n<p>\nThe NI-9870 provides <strong>four independent RS-232 ports<\/strong>.\n<\/p>\n<h4>What serial standard does NI-9870 support?<\/h4>\n<p>\nThe NI-9870 is designed for <strong>\u0420\u0421-232<\/strong> serial communication.\n<\/p>\n<h4>What is the maximum baud rate of NI-9870?<\/h4>\n<p>\nThe NI-9870 supports baud rates up to <strong>921.6 kbit\/s<\/strong>.\n<\/p>\n<h4>What connector does NI-9870 use?<\/h4>\n<p>\nThe NI-9870 provides <strong>four RJ50 connectors<\/strong>, one for each RS-232 interface.\n<\/p>\n<h4>Can NI-9870 connect directly to a DB9 serial device?<\/h4>\n<p>\nThe NI-9870 uses RJ50 connectors, while many conventional RS-232 devices use DB9 connectors. An appropriate serial cable or adapter may therefore be required. Always verify the pinout of both devices before connection.\n<\/p>\n<h4>Does NI-9870 require external power?<\/h4>\n<p>\nYes. The NI-9870 requires an appropriate external power source for operation of its serial interfaces.\n<\/p>\n<h4>Does NI-9870 support RS-485?<\/h4>\n<p>\nNo. The NI-9870 is an RS-232 interface module. For RS-422 or RS-485 communication, consider the <strong>NI-9871<\/strong>.\n<\/p>\n<h4>What is the difference between NI-9870 and NI-9871?<\/h4>\n<p>\nThe NI-9870 provides four <strong>\u0420\u0421-232<\/strong> ports, while the NI-9871 provides four <strong>RS-422\/RS-485<\/strong> serial interfaces. The correct model depends on the electrical serial standard used by the connected device.\n<\/p>\n<h4>Can NI-9870 communicate with four devices simultaneously?<\/h4>\n<p>\nThe NI-9870 provides four independent serial ports, allowing multiple RS-232 devices to be integrated into the same system. Actual communication behavior depends on the software and system architecture.\n<\/p>\n<h4>Can NI-9870 be used for instrument control?<\/h4>\n<p>\nYes. Instrument control is a common application, particularly for laboratory and industrial equipment that provides an RS-232 communication interface.\n<\/p>\n<h4>Can NI-9870 be used with CompactRIO?<\/h4>\n<p>\nYes. The NI-9870 can be used with compatible CompactRIO systems for embedded and real-time serial communication applications.\n<\/p>\n<h4>Can NI-9870 be used with CompactDAQ?<\/h4>\n<p>\nThe NI-9870 can be used in supported CompactDAQ configurations. Compatibility should be checked against the exact CompactDAQ chassis and software environment before purchase.\n<\/p>\n<h4>Can NI-9870 be used with LabVIEW?<\/h4>\n<p>\nYes. The NI-9870 can be integrated into compatible LabVIEW applications for serial communication, instrument control, automated test, and embedded system development.\n<\/p>\n<h4>Is NI-9870 suitable for Modbus RTU?<\/h4>\n<p>\nThe NI-9870 provides the RS-232 physical communication interface. If a Modbus RTU device operates over RS-232, the appropriate software implementation can communicate with the device through the NI-9870. Protocol compatibility and software support should be verified for the specific application.\n<\/p>\n<h4>Can NI-9870 replace a USB-to-RS-232 adapter?<\/h4>\n<p>\nIn a compatible NI C Series system, the NI-9870 can provide RS-232 connectivity without separate USB serial adapters. It is particularly useful when multiple serial ports need to be integrated with measurement and control I\/O.\n<\/p>\n<h4>Why is my NI-9870 not communicating?<\/h4>\n<p>\nCommon causes include missing external power, incorrect RJ50-to-device wiring, reversed TX\/RX connections, incorrect baud rate, parity or stop-bit settings, incorrect flow control, DTE\/DCE wiring issues, incompatible chassis configuration, or incorrect software settings.\n<\/p>\n<h4>What should I check before purchasing NI-9870?<\/h4>\n<p>\nVerify that the connected equipment uses RS-232, then check the number of required ports, baud rate, flow-control requirements, RJ50 cable or adapter requirements, external power requirements, CompactDAQ or CompactRIO chassis compatibility, software compatibility, 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-9870 4-Port C Series RS-232 Serial Interface Module<\/strong> provides four independent RS-232 interfaces for integrating serial instruments, sensors, controllers, and legacy equipment into compatible NI measurement and control systems. With serial communication rates up to 921.6 kbit\/s, C Series integration, and support for CompactRIO and compatible CompactDAQ applications, the NI-9870 is well suited for industrial automation, instrument control, automated test, laboratory systems, embedded control, and legacy RS-232 device integration.<\/p>","protected":false},"excerpt":{"rendered":"<p>Supported Serial Protocols: RS232<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: 921.6 kbits\/s<\/p>","protected":false},"featured_media":31098,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[673],"product_tag":[],"class_list":["post-29617","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":"<!-- 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