National Instruments NI 9871, RS422, RS485 Electromagnetic Compatibility

© National Instruments Corp. 17 NI 9871 Operating Instructions

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

Note For UL and other safety certifications, refer to the

product label, or visit ni.com/certification, search

by model number or product line, and click the

appropriate link in the Certification column.

Electromagnetic Compatibility

Emissions..........................................EN 55011 Class A at 10 m

FCC Part 15A above 1 GHz

Immunity...........................................Industrial levels per

EN61326-1:1997 +

A2:2001, Table A.1

EMC/EMI........................................ .CE, C-Tick, and FCC Part 15

(Class A) Compliant

Contents

Main Safety Guidelines Safety Guidelines for Hazardous Locations Special Conditions for Hazardous Locations in Europe Special Conditions for Marine Applications Wiring the NI 9871 The NI 9871 has four RJ-50 receptacles that provide connections for four RS485/RS422 devices. Table 1. RS485/RS422 Port Pinout RJ-50 Pin Signal Name* Table 2. Pin Assignments for RS485/RS422 DB-9 Male Connector Connector Pin Signal Page Page Page RS485 Bus Topology and Termination RS485 terminators are available at ni.com/serial. Figure 4. 4-Wire Full-Duplex Multidrop Network Using Terminating Resistors Figure 5. 2-Wire Multidrop Network Using Terminating Resistors RS485 Transceiver Control NI 9871 Hardware Overview Sleep Mode (CompactRIO Only) Specifications Power Requirements Physical Characteristics Safety Maximum Voltage Isolation Voltages Hazardous Locations Safety Standards Electromagnetic Compatibility CE Compliance Online Product Certification Shock and Vibration Environmental Environmental Management Waste Electrical and Electronic Equipment (WEEE) RoHS Where to Go for Support Page 372277B-01 Sep08