National Instruments Network Card NI 9871 User Manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS  
NI 9871  
4-Port, RS485/RS422 Serial Module  
 
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.  
Follow these guidelines if you are installing the NI 9871 in a  
potentially 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 area is known  
to be nonhazardous.  
Caution Do not remove modules unless power has been  
switched off or the area is known to be nonhazardous.  
Caution Substitution of components may impair  
suitability for Class I, Division 2.  
Caution For Zone 2 applications, install the  
CompactRIO system in an enclosure rated to at least  
IP 54 as defined by IEC 60529 and EN 60529.  
© National Instruments Corp.  
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NI 9871 Operating Instructions  
 
Caution For Zone 2 applications, install a protection  
device between the RS485/RS422 signal cables and the  
NI 9871 RJ-50 jacks (ports 1–4). The device must  
prevent the RS485/RS422 signal-to-signal or  
signal-to-COM voltage from exceeding 23 V if there is a  
transient overvoltage condition.  
Caution For Zone 2 applications, install a protection  
device between the external power supply and the  
NI 9871 Vsup and COM pins. The device must prevent the  
V
sup-to-COM voltage from exceeding 39 V if there is a  
transient overvoltage condition.  
Special Conditions for Hazardous Locations in Europe  
This equipment has been evaluated as Ex nA IIC T4 equipment  
under DEMKO Certificate No. 07 ATEX 0626664X. Each module  
is marked  
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  
must use the device in an NI chassis or controller that has been  
evaluated as EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4  
equipment.  
NI 9871 Operating Instructions  
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ni.com  
 
Special Conditions for Marine Applications  
Some modules are Lloyd’s Register (LR) Type Approved for  
marine applications. To verify Lloyd’s Register certification, visit  
ni.com/certification and search for 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 metal enclosure. Suppression ferrites  
must be installed on power supply inputs near power  
entries to modules and controllers. 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.  
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NI 9871 Operating Instructions  
 
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*  
No Connect  
TXD–  
1
2
3
TXD+  
RJ50 Jack  
4
RTS–  
1
2
NC  
TXD–  
TXD+  
RTS–  
CTS–  
RXD–  
RXD+  
RTS+  
CTS+  
COM  
5
CTS–  
3
4
6
RXD–  
5
6
7
7
RXD+  
8
9
8
RTS+  
10  
9
CTS+  
10  
GND  
* These signals are shared by all four RJ-50 connectors on the NI 9871.  
NI 9871 Operating Instructions  
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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  
1
Signal  
GND  
2
CTS+  
RTS+  
RXD+  
RXD–  
CTS–  
RTS–  
TXD+  
TXD–  
3
4
1
2
3
4
5
6
7
8
9
5
6
7
8
9
© National Instruments Corp.  
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NI 9871 Operating Instructions  
 
 
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.  
2
4
1
3
1
VSUP  
2
VSUP  
3
COM  
4
COM  
Figure 1. Four-Position External Power Connector  
NI 9871 Operating Instructions  
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Figure 2 shows the method of power connection to the NI 9871  
module. Attach an isolated power supply to the Vsup and COM  
terminals using the included pigtail.  
Red (+)  
V+  
V–  
Black (–)  
Any 8 - 28 V  
Isolated  
Power Supply  
NI P/N 198159-XX:  
Female Microfit  
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 to more than one module  
using the same power source. One y-adapter is needed for each  
© National Instruments Corp.  
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NI 9871 Operating Instructions  
 
 
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.  
NI P/N 198159-XX:  
Female Microfit  
Pigtail  
Red (+)  
V+  
V–  
Black (–)  
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  
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ni.com  
 
 
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.  
Slave 1  
Tx  
Slave 2  
Tx  
Slave n  
Tx  
Rx  
Rx  
Rx  
Tx  
120 Ω  
120 Ω  
Rx  
120 Ω  
120 Ω  
Figure 4. 4-Wire Full-Duplex Multidrop Network Using Terminating Resistors  
Slave 1  
Tx  
Slave 2  
Tx  
Slave n  
Tx  
Rx  
Rx  
Rx  
Tx  
120 Ω  
120 Ω  
Rx  
Figure 5. 2-Wire Multidrop Network Using Terminating Resistors  
RS485 terminators are available at ni.com/serial.  
© National Instruments Corp.  
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NI 9871 Operating Instructions  
 
   
RS485 Transceiver Control  
Refer to Table 3 for a listing of TX and RX enable conditions for  
the different RS485 transceiver control modes.  
Table 3. Transceiver Control Pin Conditions  
2-Wire  
Enable  
TX  
4-Wire  
On  
DTR/Echo  
DTR  
DTR/No Echo  
DTR  
Auto  
TX  
RX  
On  
On  
DTR#  
TX#  
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  
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ni.com  
 
 
Sleep Mode (CompactRIO Only)  
You can enable sleep mode for the CompactRIO system in  
software. In sleep mode, the system consumes less power and may  
dissipate less heat. Typically, when a system is in sleep 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 typical for the range –40 to 70 °C  
unless otherwise noted.  
Maximum baud rate..........................3.6864 Mbps  
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;  
Bellcore Issue 6, Method 1,  
Case 3, Limited Part Stress  
Method  
© National Instruments Corp.  
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NI 9871 Operating Instructions  
 
 
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 μW 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 supply consumption from external supply VSUP  
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  
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Safety  
Maximum Voltage1  
Connect only voltages that are within these limits.  
RS485/RS422 Port-to-COM............. –8 to +13 VDC max,  
Measurement Category I  
VSUP-to-COM ................................... 28 V max,  
Measurement Category I  
Measurement Category I is for measurements performed on  
circuits not directly connected to the electrical distribution 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  
circuits. Such voltage measurements include signal levels, special  
equipment, limited-energy parts of equipment, circuits powered by  
regulated low-voltage sources, and electronics.  
Caution Do not connect to signals or use for  
measurements within Measurement Categories II, III,  
or IV.  
1 The maximum voltage that can be applied or output without creating a safety hazard.  
© National Instruments Corp.  
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NI 9871 Operating Instructions  
 
Isolation Voltages  
Port-to-earth ground  
Withstand....................................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) .................................Class I, Division 2,  
Groups A, B, C, D, T4;  
Class I, Zone 2,  
Ex nA II T4  
Europe (DEMKO).............................Ex nA IIC T4  
NI 9871 Operating Instructions  
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ni.com  
 
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  
EN 61326-1:1997 +  
A2:2001, Table A.1  
EMC/EMI .........................................CE, C-Tick, and FCC Part 15  
(Class A) Compliant  
© National Instruments Corp.  
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NI 9871 Operating Instructions  
 
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 device with  
shielded cabling.  
CE Compliance  
This product meets the essential requirements of 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 to the product Declaration of Conformity (DoC) for  
additional regulatory compliance information. To obtain product  
certifications and the DoC for this product, visit ni.com/  
certification, search by module number or product line, and  
click the appropriate link in the Certification column.  
NI 9871 Operating Instructions  
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ni.com  
 
 
Shock and Vibration  
To meet these specifications, you must panel mount the  
CompactRIO system.  
Operating vibration,  
random (IEC 60068-2-64) ................5 grms, 10 to 500 Hz  
Operating shock  
(IEC 60068-2-27)..............................30 g, 11 ms half sine,  
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 the CompactRIO system in a suitably rated  
enclosure. Refer to the installation instructions for the chassis you  
are using for more information about meeting these specifications.  
Operating temperature ......................40 to 70 °C  
Storage temperature..........................40 to 85 °C  
Ingress protection..............................IP 40  
© National Instruments Corp.  
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NI 9871 Operating Instructions  
 
Operating humidity...........................10 to 90% RH,  
noncondensing  
Storage humidity...............................5 to 95% RH,  
noncondensing  
Maximum altitude.............................2,000 m  
Pollution Degree (IEC 60664)..........2  
Environmental Management  
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.  
For additional environmental information, refer to the NI and the  
Environment Web page at ni.com/environment. This page  
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  
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Waste Electrical and Electronic Equipment (WEEE)  
EU Customers At the end of their life cycle, 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.  
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NI 9871 Operating Instructions  
 
Where to Go for Support  
The National Instruments Web site is your complete resource for  
technical support. At ni.com/support you have access to  
everything from troubleshooting and application development  
self-help resources to email and phone assistance from  
NI Application Engineers.  
National Instruments corporate headquarters is located at  
11500 North Mopac Expressway, Austin, Texas, 78759-3504.  
National Instruments 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 instructions or dial 512 795 8248. For  
telephone support outside the United States, contact your local  
branch office:  
Australia 1800 300 800, Austria 43 662 457990-0,  
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,  
Canada 800 433 3488, China 86 21 5050 9800,  
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,  
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,  
Germany 49 89 7413130, India 91 80 41190000,  
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,  
NI 9871 Operating Instructions  
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Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,  
Malaysia 1800 887710, Mexico 01 800 010 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, Slovenia 386 3 425 42 00,  
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.  
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NI 9871 Operating Instructions  
 
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.  
For patents covering National Instruments products/technology, refer to the appropriate location: Help»Patents in  
your software, the patents.txt file on your media, or the National Instruments Patent Notice at  
ni.com/patents.  
© 2007–2008 National Instruments Corp. All rights reserved.  
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