National Instruments NI 9871, Operating Instructions Manual

Page 1: ...OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9871 4 Port RS485 RS422 Serial Module...

Page 2: ...mation about C Series documentation Note The safety guidelines and specifications in this document are specific to the NI 9871 The other components in the system might not meet the same safety ratings...

Page 3: ...tentially explosive environment Not following these guidelines may result in serious injury or death Caution Do not disconnect I O side wires or connectors unless power has been switched off or the ar...

Page 4: ...e NI 9871 Vsup and COM pins The device must prevent the Vsup to COM voltage from exceeding 39 V if there is a transient overvoltage condition Special Conditions for Hazardous Locations in Europe This...

Page 5: ...the LR certificate or look for the Lloyd s Register mark on the module Caution To meet radio frequency emission requirements for marine applications use shielded cables and install the system in a met...

Page 6: ...vide connections for four RS485 RS422 devices Table 1 RS485 RS422 Port Pinout RJ 50 Pin Signal Name 1 No Connect 2 TXD 3 TXD 4 RTS 5 CTS 6 RXD 7 RXD 8 RTS 9 CTS 10 GND These signals are shared by all...

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 Pin Signal 1 GND 2 CTS 3...

Page 8: ...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...

Page 9: ...and COM terminals using the included pigtail Figure 2 Powering the NI 9871 from an Isolated Power Source Figure 3 shows how to use the optional y adapter available at ni com serial to connect power t...

Page 10: ...imum power requirements for all modules connected Caution All connections must be made before power is applied Figure 3 Powering Multiple Modules from a Single Power Supply Red Black NI P N 198303 XX...

Page 11: ...ire RS485 bus topologies and termination Figure 4 4 Wire Full Duplex Multidrop Network Using Terminating Resistors Figure 5 2 Wire Multidrop Network Using Terminating Resistors RS485 terminators are a...

Page 12: ...485 transceiver control modes 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...

Page 13: ...ep mode you cannot communicate with the modules Refer to the Specifications section for more information about power consumption and thermal dissipation Specifications The following specifications are...

Page 14: ...sumption from chassis Active mode 0 5 W max Sleep mode 50 W max Thermal dissipation at 70 C Active mode 1 5 W max Sleep mode 55 mW max Required external supply voltage range VSUP 8 to 28 VDC Power sup...

Page 15: ...ution system referred to as MAINS voltage MAINS is a hazardous live electrical supply system that powers equipment This category is for measurements of voltages from specially protected secondary circ...

Page 16: ...1000 Vrms verified by a dielectric withstand test 5 s Continuous 60 VDC Measurement Category I Hazardous Locations U S UL Class I Division 2 Groups A B C D T4 Class I Zone 2 AEx nA II T4 Canada C UL...

Page 17: ...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 appropriat...

Page 18: ...f applicable European Directives as amended for CE marking as follows Low Voltage Directive safety 2006 95 EC Electromagnetic Compatibility Directive EMC 2004 108 EC Online Product Certification Refer...

Page 19: ...e 50 g 3 ms half sine 18 shocks at 6 orientations Operating vibration sinusoidal IEC 60068 2 6 5 g 10 to 500 Hz Environmental CompactRIO modules are intended for indoor use only For outdoor use mount...

Page 20: ...ng 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 For additional e...

Page 21: ...le all products must be sent to a WEEE recycling center For more information about WEEE recycling centers and National Instruments WEEE initiatives visit ni com environment weee htm RoHS National Inst...

Page 22: ...ments also has offices located around the world to help address your support needs For telephone support in the United States create your service request at ni com support and follow the calling instr...

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