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National Instruments NI 9871 Getting Started Manual

4-port, rs485/rs422 serial module
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  • Page 1 NI-9871...
  • Page 2 GETTING STARTED GUIDE NI 9871 4-Port, RS485/RS422 Serial Module Français Deutsch 日本語 한국어 简体中文 ni.com/manuals...

  • Page 3: Safety Guidelines

    The guidelines in this document are specific to Note the NI 9871. The other components in the system might not meet the same safety ratings. Refer to the documentation for each component in the system to determine the safety and EMC ratings for the entire system.

  • Page 4: Safety Guidelines For Hazardous Locations

    Instruments for repair. 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 IIC T4 and Ex nA IIC T4 hazardous locations; and nonhazardous locations only.
  • Page 5 IECEx 14.0089X certified. Each NI 9871 is marked II 3G and is suitable for use in Zone 2 hazardous locations, in ambient temperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI 9871 4 | ni.com | NI 9871 Getting Started Guide...
  • Page 6 (shipboard) applications. To verify Lloyd’s Register certification for a product, visit ni.com/certification and search for the LR certificate, or look for the Lloyd’s Register mark on the product. NI 9871 Getting Started Guide | © National Instruments | 5...

  • Page 7: Wiring The Ni 9871

    EMC performance is attained. Wiring the NI 9871 The NI 9871 has four RJ-50 receptacles that provide connections for four RS485/RS422 devices. 6 | ni.com | NI 9871 Getting Started Guide...
  • Page 8 RJ50 Jack RTS- TXD– CTS- TXD+ RTS– CTS– RXD- RXD– RXD+ RXD+ RTS+ CTS+ RTS+ CTS+ *These signals are shared by all four RJ-50 connectors on the NI 9871. NI 9871 Getting Started Guide | © National Instruments | 7...
  • Page 9 NI pinout on a DB-9 male connector, as shown in Table 2. Table 2. Pin Assignments for RS485/RS422 DB-9 Male Connector Connector RJ-50 Pin Signal Name CTS+ RTS+ RXD+ RXD- CTS- RTS- TXD+ TXD- 8 | ni.com | NI 9871 Getting Started Guide...
  • Page 10 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 11 1. V 2. V 3. COM 4. COM 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. 10 | ni.com | NI 9871 Getting Started Guide...
  • Page 12 Figure 2. Powering the NI 9871 from an Isolated Power Source Red (+) V– Black (–) Any 8 to 28 V Isolated Power Supply NI P/N 198159-XX: Female Microfit Pigtail Figure 3 shows how to use the optional Y-adapter (available at ni.com/serial) to connect power to more than one module using...

  • Page 13: Rs485 Bus Topology And Termination

    Power Supply NI P/N 198303-XX: Male Microfit Y-Adapter RS485 Bus Topology and Termination Refer to Figure 4 and Figure 5 for an overview of 4-wire and 2-wire RS485 bus topologies and termination. 12 | ni.com | NI 9871 Getting Started Guide...
  • Page 14 120 Ω 120 Ω The driver directly supports 4-wire full-duplex operation on peer- to-peer RS-485 networks. Multidrop RS-485 networks require additional software development. RS485 terminators are available at ni.com/serial. NI 9871 Getting Started Guide | © National Instruments | 13...

  • Page 15: Rs485 Transceiver Control

    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. 14 | ni.com | NI 9871 Getting Started Guide...

  • Page 16: Sleep Mode (Compactrio Only)

    The following specifications are typical for the range -40 °C to 70 °C unless otherwise noted. Maximum baud rate 3.6864 Mbps Maximum module 1.28 Mbps throughput Maximum cable length 1.2 km (4,000 ft) NI 9871 Getting Started Guide | © National Instruments | 15...

  • Page 17: Power Requirements

    0.5 W max Sleep mode 50 µW max Thermal dissipation (at 70 °C) Active mode 1.5 W max Sleep mode 55 W max Required external supply +8 to +28 VDC voltage range (V 16 | ni.com | NI 9871 Getting Started Guide...

  • Page 18: Physical Characteristics

    -8 to +13 VDC max, Measurement Category I -to-COM ±28 V max, Measurement Category I The maximum voltage that can be applied or output without creating a safety hazard. NI 9871 Getting Started Guide | © National Instruments | 17...
  • Page 19 Do not connect to signals or use for Caution measurements within Measurement Categories II, III, or IV. Isolation Voltages Port-to-earth ground Continuous 60 VDC, Measurement Category I up to 5,000 m in altitude 18 | ni.com | NI 9871 Getting Started Guide...

  • Page 20: Safety And Hazardous Locations Standards

    UL 60079-0; Ed 5, UL 60079-15; Ed 3 • CSA 60079-0:2011, CSA 60079-15:2012 For UL and other safety certifications, refer to Note the product label or the Online Product Certification section. NI 9871 Getting Started Guide | © National Instruments | 19...

  • Page 21: Hazardous Locations

    Operating temperature -40 °C to 70 °C (IEC 60068-2-1, IEC 60068-2-2) Storage temperature -40 °C to 85 °C (IEC 60068-2-1, IEC 60068-2-2) Ingress protection IP 30 20 | ni.com | NI 9871 Getting Started Guide...

  • Page 22: Shock And Vibration

    5 g, 10 Hz to 500 Hz 60068-2-6) Operating shock (IEC 30 g, 11 ms half sine; 60068-2-27) 50 g, 3 ms half sine; 18 shocks at 6 orientations NI 9871 Getting Started Guide | © National Instruments | 21...

  • Page 23: Electromagnetic Compatibility

    ICES-001: Class A emissions For the standards applied to assess the EMC of Note this product, refer to the Online Product Certification section. For EMC compliance, operate this product Note according to the documentation. 22 | ni.com | NI 9871 Getting Started Guide...

  • Page 24: Online Product Certification

    NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers. NI 9871 Getting Started Guide | © National Instruments | 23...
  • Page 25 NI products in your region, visit ni.com/ environment/weee. 电子信息产品污染控制管理办法（中国 RoHS） National Instruments 符合中国电子信息产 中国客户 品中限制使用某些有害物质指令(RoHS)。关于 National Instruments 中国 RoHS 合规性信息，请登 ni.com/environment/rohs_china 录 。(For information about China RoHS compliance, go to ni.com/environment/rohs_china 24 | ni.com | NI 9871 Getting Started Guide...

  • Page 26: Worldwide Support And Services

    You can obtain the DoC for your product by visiting ni.com/certification. If your product supports calibration, you can obtain the calibration certificate for your product at ni.com/calibration. NI 9871 Getting Started Guide | © National Instruments | 25...
  • Page 27 National Instruments corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504. National Instruments also has offices located around the world. For telephone support in the United States, create your service request at or dial 1 866 ASK MYNI (275 6964).

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