National Instruments NI 9870 User manual

GETTING STARTED GUIDE
NI 9870
4-Port, RS232 Serial Module
This document explains how to connect to the NI 9870.

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 9870. 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 9870 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 9870 in a manner not
specified in this document. Product misuse can result in
a hazard. You can compromise the safety protection
built into the product if the product is damaged in any
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way. If the product is damaged, return it to NI for
repair.
Safety Guidelines for Hazardous Locations
The NI 9870 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 9870 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 Division 2 and Zone 2 applications,
install the system in an enclosure rated to at least IP54
as defined by IEC/EN 60079-15.
NI 9870 Getting Started Guide | © National Instruments Corporation | 3

Caution For Zone 2 applications, install a protection
device between the RS232 signal cables and the
NI 9870 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 9870 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 Use in
Europe and Internationally
The NI 9870 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 9870 is marked II 3G and
is suitable for use in Zone 2 hazardous locations, in ambient
temperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI 9870
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.
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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) Type 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.
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
NI 9870 Getting Started Guide | © National Instruments Corporation | 5

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 9870
The NI 9870 has four RJ-50 receptacles that provide connections
for four RS232 devices.
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Table 1. RS232 Port Pinout
RJ-50 Pin Signal Name*
DCD
NC
RI
CTS
RTS
DSR
COM
DTR
TXD
RXD
10
1
RJ50 Jack
2
3
4
5
6
7
8
9
1 No Connect
2 RI
3 CTS
4 RTS
5 DSR
6 GND
7 DTR
8 TXD
9 RXD
10 DCD
*These signals are shared by all four RJ-50 connectors on the NI 9870.
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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
Table 2.
Table 2. Pin Assignments for RS232 DB-9 Male Connector
Connector RJ-50 Pin Signal Name
6
7
8
9
1
2
3
4
5
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
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You must connect an external power supply to the NI 9870. This
power supply provides the power for the RS232 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 9870.
Caution To ensure the specified EMC performance,
do not connect the power input to a DC mains supply
or to any supply requiring a connecting cable longer
than 30 m (100 ft). A DC mains supply is a local DC
electricity supply network in the infrastructure of a
certain site or building.
NI 9870 Getting Started Guide | © National Instruments Corporation | 9

Figure 1. Four-Position External Power Connector
1
3
4
2
1. VSUP
2. VSUP
3. COM
4. COM
Figure 2 shows the method of power connection to the NI 9870
module. Attach an isolated power supply to the VSUP and COM
terminals using the included pigtail.
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Figure 2. Powering the NI 9870 from an Isolated Power Source
Red (+)
Black (–)
NI P/N 198159-XX:
Female Microfit
Pigtail
V+
V–
Any 8 to 28 V
Isolated
Power Supply
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
additional module. Ensure that the power supply can handle
maximum power requirements for all modules connected.
Caution Make all connections before applying power.
NI 9870 Getting Started Guide | © National Instruments Corporation | 11

Figure 3. Powering Multiple Modules from a Single Power Supply
Red (+)
Black (–)
NI P/N 198303-XX:
Male Microfit
Y-Adapter
NI P/N 198159-XX:
Female Microfit
Pigtail
V+
V–
Any 8 to 28 V
Isolated
Power Supply
NI 9870 Hardware Overview
The NI 9870 has four full-featured, independent RS232 DTE
ports that are isolated from the other modules in the system. Each
port is fully compatible with the ANSI/EIA/TIA-232 standard.
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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 °C to
70 °C unless otherwise noted.
Maximum baud rate 921.6 kbps
Maximum module
throughput
1.28 Mbps
Maximum cable length 250 pF equivalent
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Note Cable capacitance greater than 250 pF may
adversely affect the maximum baud rate and thermal
dissipation.
Maximum RS232 Receive
signal (RXD, CTS, DSR,
DCD, RI) continuous
voltage
±8 V
Note Continuous RS232 input voltages in excess of
±8 V may cause excessive thermal dissipation.
Data line ESD protection
(human body model)
±15 kV
MTBF 448,008 hours at 25 °C; Bellcore
Issue 6, Method 1, Case 3,
Limited Part Stress Method
Note Contact NI for Bellcore MTBF specifications at
other temperatures or MIL-HDBK-217F specifications.
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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 0.5 W max
Required external supply
voltage range (VSUP)
+8 to +28 VDC
Power supply consumption from external supply VSUP
Typical 0.5 W
Maximum 2 W
Physical Characteristics
To clean the module, wipe it with a dry towel.
Weight Approx. 154 g (5.4 oz)
NI 9870 Getting Started Guide | © National Instruments Corporation | 15

Safety
Maximum Voltage1
Connect only the voltages that are within these limits.
RS232 Receive Signal-to-
COM (RXD, CTS, DSR,
DCD, RI)
±25 V max, Measurement
Category I
RS232 Transmit Signal-to-
COM (TX, RTS, DTR)
±13.2 V max, Measurement
Category I
VSUP-to-COM ±28 V max, Measurement
Category I
Measurement Category I is for measurement 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 included signal levels,
1The maximum voltage that can be applied or output without creating a safety
hazard.
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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.
Isolation Voltages
Port-to-earth ground
Continuous 60 VDC, Measurement
Category I up to 5,000 m in
altitude
Withstand
up to 2,000 m in
altitude
1000 Vrms verified by a 5s
dielectric withstand test
up to 5,000 m in
altitude
500 Vrms verified by a 5s
dielectric withstand test
NI 9870 Getting Started Guide | © National Instruments Corporation | 17

Safety and Hazardous Locations Standards
This product is designed to meet the requirements of the
following electrical equipment safety standards for measurement,
control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
• EN 60079-0:2012, EN 60079-15:2010
• IEC 60079-0: Ed 6, IEC 60079-15; Ed 4
• UL 60079-0; Ed 5, UL 60079-15; Ed 3
• CSA 60079-0:2011, CSA 60079-15:2012
Note For UL and other safety certifications, refer to
the product label or the Online Product Certification
section.
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Hazardous Locations
U.S. (UL) Class I, Division 2, Groups A,
B, C, D, T4; Class I, Zone 2,
AEx nA IIC T4
Canada (C-UL) Class I, Division 2, Groups A,
B, C, D, T4; Class I, Zone 2, Ex
nA IIC T4
Europe (DEMKO) Ex nA IIC T4 Gc
Environmental
Refer to the manual for the chassis you are using for more
information about meeting these specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 70 °C
Storage temperature
(IEC 60068-2-1, IEC 60068-2-2)
-40 °C to 85 °C
Ingress protection IP 30
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Operating humidity
(IEC 60068-2-56)
10% RH to 90% RH,
noncondensing
Storage humidity
(IEC 60068-2-56)
5% RH to 95% RH,
noncondensing
Pollution degree 2
Maximum altitude 2,000 m
Indoor use only.
Shock and Vibration
To meet these specifications, you must panel mount the system.
Operating vibration
Random (IEC
60068-2-64)
5 grms, 10 Hz to 500 Hz
Sinusoidal (IEC
60068-2-6)
5 g, 10 Hz 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
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