National Instruments RS422 manual

OPERATING INSTRUCTIONS AND S PECIFICATIONS NI 9871 4-Port, RS485/RS42 2 Serial Modu le[...]

NI 9871 Operating Instructions 2 ni.com This document describes how to use the National Instruments 9871 and includes specif icat ions and pin assignments for the NI 9871. Vi s i t ni.com/info and enter rdsoftwareversion to determine which software you need for the modules you are using. F or information about inst alling, conf iguring, and program[...]

© National Instruments Corp. 3 NI 9871 Operating Instructions Safety Guidelines fo r Hazardous Loca tions The NI 9871 is suitable for use in Cl ass I, Division 2, Groups A, B, C, D, T4 hazardous locations; Clas s I, Zone 2, AEx nA II T4 and Ex nA II T4 hazardous locations ; and nonhazardous locations only . Follo w these guidelines if you ar e ins[...]

NI 9871 Operating Instructions 4 ni.com Caution For Zone 2 applications, install a protection device between the RS485/RS 422 signal cables and the NI 9871 RJ-50 jacks (p orts 1– 4). The device must prev ent the RS485/RS422 signal-to -signal or signal-to-COM voltage from ex ceeding 23 V if there is a transient overv oltage condition. Caution For [...]

© National Instruments Corp. 5 NI 9871 Operating Instructions Special Conditions fo r Marine Appli cations Some modules are Lloyd’ s Register (LR) T ype Approved for marine applications. T o verify Llo yd’ s Register cert if ication, visit ni.com/certification and search for the LR certificate, or look for the Lloyd’ s Register mark on th e [...]

NI 9871 Operating Instructions 6 ni.com Wiring the NI 9871 The NI 9871 has four RJ-50 recep t acles that prov ide connections for four RS485/RS422 de vices. Table 1. RS485/RS422 Po rt Pinout RJ-50 Pin Signal Name* 1 No Connect 2 TXD– 3 TXD+ 4 RT S – 5 CTS– 6 RXD– 7 RXD+ 8 RT S + 9 CTS+ 10 GND * These signals are shared by all four RJ-50 con[...]

© National Instruments Corp. 7 NI 9871 Operating Instructions The cables included with your kit con vert the RJ-50 pinout to the standard NI pinout, as shown in T able 2. Table 2. Pin Assignments for RS485/RS422 DB-9 Male Connector Connector Pin Signal 1 GND 2 CTS+ 3 RT S + 4 RXD+ 5 RXD– 6 CTS– 7 RT S – 8 TXD+ 9 TXD– 6 7 8 9 1 2 3 4 5[...]

NI 9871 Operating Instructions 8 ni.com Y ou must connect an external po wer supply to the NI 9871. This power supply p rovides the po wer for the RS485/RS422 transceiv ers on th e module. Y ou can use the included female four-position pigtail to connect to an e xternal vo ltage source. Figure 1 lists the connections bet w een an external v oltage [...]

© National Instruments Corp. 9 NI 9871 Operating Instructions Figure 2 shows the method of po wer connection to the NI 9871 module. Attach an isolated power supply to the V sup and C OM terminals using the included pigtail. Figure 2. Powering the NI 9871 fr om an Isolated Power Sour ce Figure 3 sho ws ho w to use the optional y-adapter (a v ailabl[...]

NI 9871 Operating Instructions 10 ni.com additional module. Ensure that the power supply can handle maximum power requirements for all modules connected. Caution All connections must be made before power is applied. Figure 3. Poweri ng Multiple Modules from a Single Power Supp ly Red (+) Black (–) NI P/N 198303-XX: Male Microfit Y -Adapter NI P/N[...]

© National Instruments Corp. 11 NI 9871 Operating Instructions RS485 Bus T opology and T ermi nation Refer to Figure 4 and Fig ure 5 for an o vervie w of 4-wire and 2-wire RS485 bus topol ogies and termination. Figure 4. 4-Wir e Full-Dupl ex Multidrop Netw ork Using T erminating Resistors Figure 5. 2-Wire Multidrop Network Using T erminating Resis[...]

NI 9871 Operating Instructions 12 ni.com RS485 T ransceiver Control Refer to T able 3 for a listing of TX and RX enable conditions for the dif ferent RS485 transcei ver contro l modes. NI 9871 Hardware Over view The NI 9871 has four independent RS48 5/RS422 ports that are isolated from the other modules in the system. Each port is fully compatible [...]

© National Instruments Corp. 13 NI 9871 Operating Instructions Sleep Mode (CompactRIO Only) Y ou can enable sleep mode fo r the CompactRIO system in software. In sleep mode, the syst em consumes less power and may dissipate less heat. T ypically , when a system is in sleep mode, you cannot communicate with th e modules. Refer to the Spec ification[...]

NI 9871 Operating Instructions 14 ni.com Note Contact NI for Bellcore MTBF specifications at other temperatures or for MIL-HDBK -217F specifications. Power Requirements Power consumption from chassis Active mode ............ ........... ........ 0.5 W max Sleep mode .............. ........... ........ 50 μ W max Thermal dissipation (at 70 °C) Act[...]

© National Instruments Corp. 15 NI 9871 Operating Instructions Safety Maximum Voltage 1 Connect only v oltages that are within these limits. RS485/RS422 Port-to-COM ........ ..... –8 to +13 VDC max, Measurement Category I V SUP -to-COM .............. ........... ......... . ±28 V max, Measurement Category I Measurement Cate gory I is f or measu[...]

NI 9871 Operating Instructions 16 ni.com Isolation Voltages Port-to-earth ground W ithstand............... ......... ............ 1000 V rms , ver ifie d by a dielectric withstand test, 5 s Continuous .......... ........... ......... ... 60 VDC, Measurement Category I Hazardous Locations U.S. (UL) ............ ........... ......... .......... Class[...]

© 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 electric al 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 certif ications, refer to [...]

NI 9871 Operating Instructions 18 ni.com Note For the standards applied to assess the EMC of this product, refer to the Online Product Certification section. Note For EMC compliance, operate this de vice with shielded cabling. CE Compliance This product meets the essentia l requirements of applicable European Directi v es, as amended for CE marking[...]

© National Instruments Corp. 19 NI 9871 Operating Instructions Shock and Vibration T o meet these spec ifications, you must panel mou nt the CompactRIO system . Operating vibration, random (IEC 60068-2-64) ... ............. 5 g rms , 10 to 500 Hz Operating shock (IEC 60068-2-27)........... ........... ........ 30 g, 11 ms half sine, 50 g, 3 ms hal[...]

NI 9871 Operating Instructions 20 ni.com Operating humidity ............. ........... ... 10 to 90% RH, noncondensing Storage humid ity ........ ........... ........... . 5 to 95% RH, noncondensing Maximum altitude.......... ......... .......... 2,000 m Pollution Degree (IEC 60664) .......... 2 Environmental Mana gement NI is committed to designing[...]

© National Instruments Corp. 21 NI 9871 Operating Instructions Waste Electrical and Electronic Equipment (WEEE) EU Customers At the end of their lif e cycle, all products must be sent to a WEEE re c ycling center . For more information about WEEE recy cling centers and National Instruments WEEE initi ativ es, visi t ni.com/ environment/weee.htm . [...]

NI 9871 Operating Instructions 22 ni.com Where to Go for Support The National Instruments W eb site is your complete resource for technical support. At ni.com/support you ha ve access to ev erything from troubleshooting and application de velopment self-help resources to emai l and phone assistance from NI Application Engineers. National Instrument[...]

© National Instruments Corp. 23 NI 9871 Operating Instructions K orea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28, Malaysia 1800 887710, Mexico 0 1 800 010 0793, Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322, Norway 47 (0) 66 90 76 60, Poland 48 22 3390150, Portugal 351 210 311 210, Russia 7 495 783 6851, Singapore 1800 226 5886, Slo v [...]

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