National Instruments 9871 Getting Started
GETTING STARTED GUIDE
NI 9871
4-Port, RS485/RS422 Serial Module
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This document explains how to connect to the National
Instruments 9871.
Note Before you begin, complete the software and
hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to
the NI 9871. The other components in the system might
not meet the same safety ratings. Refer to the
documentation for each component in the system to
determine the safety and EMC ratings for the entire
system.
Safety Guidelines
Operate the NI 9871 only as described in this document.
Hot Surface This icon denotes that the component
may be hot. Touching this component may result in
bodily injury
.
Caution Do not operate the NI 9871 in a manner not
specified in this document. Product misuse can result in
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a hazard. You can compromise the safety protection
built into the product if the product is damaged in any
way. If the product is damaged, return it to National
Instruments for repair
.
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 IIC T4
and Ex nA IIC 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
.
NI 9871 Getting Started Guide | © National Instr
uments | 3
Caution For Division 2 and Zone 2 applications,
install the system in an enclosure rated to at least IP54
as defined by
IEC/EN 60079-15.
Caution For Zone 2 applications, install a protection
device between the RS232 signal cables and the
NI 9871 RJ-50 jacks (ports 1 to 4). The device must
prevent the RS232 signal-to-signal or signal-to-COM
voltage from exceeding 35 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 V
sup
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 Use in
Europe and Internationally
The
NI 9871 has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO Certificate No. 07 ATEX 0626664X and is
IECEx 14.0089X certified. Each NI 9871 is marked II 3G and
is suitable for use in Zone 2 hazardous locations, in ambient
temperatures of -40 °C ≤ T
a ≤ 70 °C. If you are using the NI 9871
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| NI 9871 Getting Started Guide
in Gas Group IIC hazardous locations, you must use the device in
an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC
T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Caution You must make sure that transient
disturbances do not exceed 140% of the rated voltage.
Caution The system shall only be used in an area of
not more than Pollution Degree 2, as defined in
IEC 60664-1.
Caution The system shall be mounted in an
ATEX/IECEx-certified enclosure with a minimum
ingress protection rating of at least IP54 as defined in
IEC/EN 60079-15.
Caution The enclosure must have a door or cover
accessible only by the use of a tool.
Special Conditions for Marine Applications
Some products are Lloyd’s Register (LR) T
ype Approved for
marine (shipboard) applications. To verify Lloyd’s Register
certification for a product, visit ni.com/certification and search
for the LR certificate, or look for the Lloyd’s Register mark on
the product.
NI 9871 Getting Started Guide | © National Instr
uments | 5
Caution In order to meet the EMC requirements for
marine applications, install the product in a shielded
enclosure with shielded and/or filtered power and
input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes
and cables to ensure that the desired EMC performance
is attained.
Wiring the NI 9871
The NI 9871 has four RJ-50 receptacles that provide connections
for four RS485/RS422 devices.
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Table 1. RS485/RS422 Port Pinout
RJ-50 Pin Signal Name*
RJ50 Jack
NC
TXD–
TXD+
R
TS–
CTS–
RXD–
RXD+
R
TS+
CTS+
COM
1
2
3
4
5
6
7
8
9
10
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 four RJ-50 connectors on the NI 9871.
NI 9871 Getting Started Guide | © National Instruments | 7
The cables included with your kit convert the RJ-50 pinout to the
standard NI pinout on a DB-9 male connector, as shown in
T
able 2.
Table 2. Pin Assignments for RS485/RS422 DB-9 Male Connector
Connector RJ-50 Pin Signal Name
6
7
8
9
1
2
3
4
5
1 GND
2 CTS+
3 RTS+
4 RXD+
5 RXD-
6 CTS-
7 RTS-
8 TXD+
9 TXD-
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