National Instruments NI 9871 Operating Instructions And Specifications
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National Instruments NI 9871 Operating Instructions And Specifications

4-port, rs485/rs422 serial module
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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9871
4-Port, RS485/RS422 Serial Module

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Summary of Contents for National Instruments NI 9871

  • Page 1 OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9871 4-Port, RS485/RS422 Serial Module...
  • Page 2 This document describes how to use the National Instruments 9871 and includes specifications and pin assignments for the NI 9871. Visit and enter to determine ni.com/info rdsoftwareversion which software you need for the modules you are using. For information about installing, configuring, and programming the system, refer to the system documentation.

  • Page 3: Safety Guidelines For Hazardous Locations

    Touching this component may result in bodily injury. Safety Guidelines for Hazardous Locations The NI 9871 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA II T4 and Ex nA II T4 hazardous locations;...
  • Page 4 IP 54 as defined by IEC 60529 and EN 60529. For Zone 2 applications, install a protection Caution device between the RS232 signal cables and the NI 9871 RJ-50 jacks (ports 1–4). The device must prevent the RS232 signal-to-signal or signal-to-COM voltage from exceeding 35 V if there is a transient overvoltage condition.
  • Page 5 In addition, take precautions when designing, selecting, and installing measurement probes and cables to ensure that the desired EMC performance is attained. © National Instruments NI 9871 Operating Instructions...

  • Page 6: Wiring The Ni 9871

    Signal Name No Connect TXD– TXD+ RJ50 Jack RTS– TXD– CTS– TXD+ RTS– RXD– CTS– RXD– RXD+ RXD+ RTS+ CTS+ RTS+ CTS+ These signals are shared by all four RJ-50 connectors on the NI 9871. NI 9871 Operating Instructions ni.com...
  • Page 7 The cables included with your kit convert the RJ-50 pinout to the standard NI pinout, as shown in Table 2. Table 2. Pin Assignments for RS485/RS422 DB-9 Male Connector Connector Signal CTS+ RTS+ RXD+ RXD– CTS– RTS– TXD+ TXD– © National Instruments NI 9871 Operating Instructions...
  • Page 8 You must connect an external power supply to the NI 9871. This power supply provides the power for the RS485/RS422 transceivers on the module. You can use the included female four-position pigtail to connect to an external voltage source. Figure 1 lists the connections between an external voltage source (of +8 V to +28 V) and the NI 9871.
  • Page 9 3 COM 4 COM Figure 1. Four-Position External Power Connector Figure 2 shows the method of power connection to the NI 9871 module. Attach an isolated power supply to the V and COM terminals using the included pigtail. © National Instruments...
  • Page 10 Power Supply NI P/N 198159-XX: Female Microfit Pigtail Figure 2. Powering the NI 9871 from an Isolated Power Source Figure 3 shows how to use the optional y-adapter (available at ) to connect power to more than one module ni.com/serial using the same power source.
  • Page 11 NI P/N 198159-XX: Female Microfit Pigtail Red (+) V– Black (–) Any 8 - 28 V Isolated Power Supply NI P/N 198303-XX: Male Microfit Y-Adapter Figure 3. Powering Multiple Modules from a Single Power Supply © National Instruments NI 9871 Operating Instructions...

  • Page 12: Rs485 Bus Topology And Termination

    120 Ω Figure 4. 4-Wire Full-Duplex Multidrop Network Using Terminating Resistors Slave 1 Slave 2 Slave n 120 Ω 120 Ω Figure 5. 2-Wire Multidrop Network Using Terminating Resistors RS485 terminators are available at ni.com/serial NI 9871 Operating Instructions ni.com...

  • Page 13: Rs485 Transceiver Control

    DTR/No Echo Auto DTR# NI 9871 Hardware Overview The NI 9871 has four independent RS485/RS422 ports that are isolated from the other modules in the system. Each port is fully compatible with the ANSI/EIA/TIA-485 standard. © National Instruments NI 9871 Operating Instructions...

  • Page 14: Sleep Mode (Compactrio Only)

    Maximum cable length ..... 1.2 km (4,000 ft.) Data line ESD protection (human body model)......±15 kV MTBF ..........514,016 hours at 25 °C; Bellcore Issue 6, Method 1, Case 3, Limited Part Stress Method NI 9871 Operating Instructions ni.com...

  • Page 15: Power Requirements

    Power supply consumption from external supply V Typical ........1 W Maximum ........3.5 W Physical Characteristics If you need to clean the module, wipe it with a dry towel. Weight..........Approx. 153 g (5.4 oz) © National Instruments NI 9871 Operating Instructions...
  • Page 16 Do not connect to signals or use for Caution measurements within Measurement Categories II, III, or IV. The maximum voltage that can be applied or output without creating a safety hazard. NI 9871 Operating Instructions ni.com...

  • Page 17: Safety Standards

    • IEC 61010-1, EN 61010-1 • UL 61010-1, CSA 61010-1 For UL and other safety certifications, refer to the Note product label or the Online Product Certification section. © National Instruments NI 9871 Operating Instructions...
  • Page 18 Operating temperature ...... –40 to 70 °C Storage temperature ......–40 to 85 °C Ingress protection......IP 30 Operating humidity......10 to 90% RH, noncondensing Storage humidity....... 5 to 95% RH, noncondensing NI 9871 Operating Instructions ni.com...

  • Page 19: Shock And Vibration

    , 10 to 500 Hz Operating shock (IEC 60068-2-27)..30 g, 11 ms half sine, 50 g, 3 ms half sine, 18 shocks at 6 orientations Operating vibration, sinusoidal (IEC 60068-2-6) ....5 g, 10 to 500 Hz © National Instruments NI 9871 Operating Instructions...

  • Page 20: Electromagnetic Compatibility

    • ICES-001: Class A emissions For the standards applied to assess the EMC of this Note product, refer to the Online Product Certification section. For EMC compliance, operate this product Note according to the documentation. NI 9871 Operating Instructions ni.com...

  • Page 21: Online Product Certification

    NI customers. For additional environmental information, refer to the NI and the Environment Web page at . This page ni.com/environment © National Instruments NI 9871 Operating Instructions...
  • Page 22 At the end of the product life cycle, all EU Customers products must be sent to a WEEE recycling center. For more information about WEEE recycling centers, National Instruments WEEE initiatives, and compliance with WEEE Directive 2002/96/EC on Waste and Electronic Equipment, visit ni.com/environment/weee...

  • Page 23: Where To Go For Support

    Where to Go for Support The National Instruments Web site is your complete resource for technical support. At you have access to ni.com/support everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.
  • Page 24 LabVIEW, National Instruments, NI, ni.com, the National Instruments corporate logo, and the Eagle logo are trademarks of National Instruments Corporation. Refer to the Trademark Information at ni.com/trademarks for other National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies.

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