National Instruments NI 9871 Operating Instructions Manual
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National Instruments NI 9871 Operating Instructions Manual

National instruments serial module operating instructions and specifications
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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: Safety Guidelines

    This document describes how to use the National Instruments 9871 and includes specifications and pin assignments for the NI 9871. Visit ni.com/info 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

    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; and nonhazardous locations only.
  • Page 4 II 3G and is suitable for use in Zone 2 hazardous locations. If you are using the NI 9871 in Gas Group IIC hazardous locations or in ambient temperatures of –40 °C ≤ Ta ≤ 70 °C, you...
  • Page 5 Power supply and module cables must be separated on opposite sides of the enclosure and must enter and exit through opposing enclosure walls. © National Instruments Corp. and search for the LR certificate, or NI 9871 Operating Instructions...
  • Page 6 The NI 9871 has four RJ-50 receptacles that provide connections for four RS485/RS422 devices. Table 1. RS485/RS422 Port Pinout * These signals are shared by all four RJ-50 connectors on the NI 9871. NI 9871 Operating Instructions RJ-50 Pin RJ50 Jack TXD–...
  • 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 © National Instruments Corp. NI 9871 Operating Instructions Signal CTS+ RTS+ RXD+ RXD–...
  • 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 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. Red (+) V– Black (–) Any 8 - 28 V Isolated Power Supply...
  • Page 10 V– 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 NI 9871 Operating Instructions NI P/N 198159-XX: Female Microfit Pigtail Red (+) Black (–) ni.com...
  • Page 11 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 © National Instruments Corp. NI 9871 Operating Instructions...
  • Page 12 Table 3. Transceiver Control Pin Conditions Enable 4-Wire 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. NI 9871 Operating Instructions...

  • Page 13: Specifications

    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; © National Instruments Corp. Bellcore Issue 6, Method 1, Case 3, Limited Part Stress Method NI 9871 Operating Instructions...

  • Page 14: Power Requirements

    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) NI 9871 Operating Instructions ) ... +8 to +28 VDC ni.com...
  • Page 15 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. © National Instruments Corp. Measurement Category I Measurement Category I NI 9871 Operating Instructions...

  • Page 16: Isolation Voltages

    Hazardous Locations U.S. (UL) ... Class I, Division 2, Canada (C-UL) ... Class I, Division 2, Europe (DEMKO)... Ex nA IIC T4 NI 9871 Operating Instructions , verified by a dielectric withstand test, 5 s Measurement Category I Groups A, B, C, D, T4;...

  • Page 17: Electromagnetic Compatibility

    Safety Standards The NI 9871 is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 • UL 61010-1, CSA 61010-1 For UL and other safety certifications, refer to the...

  • Page 18: Online Product Certification

    Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit , search by module number or product line, and certification click the appropriate link in the Certification column. NI 9871 Operating Instructions ni.com/ ni.com...

  • Page 19: Shock And Vibration

    Operating temperature ... –40 to 70 °C Storage temperature ... –40 to 85 °C Ingress protection... IP 40 © National Instruments Corp. , 10 to 500 Hz 50 g, 3 ms half sine, 18 shocks at 6 orientations NI 9871 Operating Instructions...

  • Page 20: Environmental Management

    For additional environmental information, refer to the NI and the Environment Web page at contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document. NI 9871 Operating Instructions noncondensing noncondensing ni.com/environment . This page...
  • Page 21 Instruments WEEE initiatives, visit environment/weee.htm National Instruments ni.com/environment/rohs_china about China RoHS compliance, go to environment/rohs_china © National Instruments Corp. At the end of their life cycle, all products National Instruments RoHS ni.com/ RoHS (RoHS) (For information ni.com/ NI 9871 Operating Instructions...

  • Page 22: 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 23 South Africa 27 0 11 805 8197, Spain 34 91 640 0085, Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151, Taiwan 886 02 2377 2222, Thailand 662 278 6777, Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545 © National Instruments Corp. NI 9871 Operating Instructions...
  • Page 24 National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation. Refer to the Terms of Use section on ni.com/legal for more information about National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies.

This manual is also suitable for:

Rs422Rs485

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