National Instruments NI 9852 Manuale utente
NI-9852
Getting Started
2022-10-25
Contents
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Wiring the NI 9852. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CAN Bus Topology and Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connecting a CAN Bus to the NI 9852. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Cabling Requirements for the NI 9852. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cable Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Determining the Necessary Termination Resistance for the Board. . . . . . . . . . . . 7
Number of CAN Nodes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
NI 9852 Hardware Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
NI 9852 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Low-Speed/Fault Tolerant CAN Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Physical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Safety Compliance and Hazardous Locations Standards. . . . . . . . . . . . . . . . . . . 10
Electromagnetic Compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CE Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Product Certifications and Declarations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Shock and Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Environmental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Environmental Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
EU and UK Customers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
电子信息产品污染控制管理办法（中国 RoHS）. . . . . . . . . . . . . . . . . . . . . . . . 12
NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ni.com
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NI-9852 Getting Started
Overview
This document explains how to connect to the NI 9852.
Note Before you begin, read the NI 9852 Safety, Environmental, and
Regulatory Information document on ni.com/manuals and complete the
soware and hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to the NI 9852. 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
Caution Observe all instructions and cautions in the user
documentation. Using the product in a manner not specified can damage
the product and compromise the built-in safety protection.
Attention Suivez toutes les instructions et respectez toutes les mises
en garde de la documentation d'utilisation. L'utilisation du produit de
toute autre façon que celle spécifiée risque de l'endommager et de
compromettre la protection de sécurité intégrée.
Safety Guidelines for Hazardous Locations
The NI 9852 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 Gc and Ex nA IIC T4 Gc hazardous locations;
and nonhazardous locations only. Follow these guidelines if you are installing the
NI 9852 in a potentially explosive environment. Not following these guidelines may
result in serious injury or death.
© National Instruments 3
NI-9852 Getting Started
Caution Do not disconnect I/O-side wires or connectors unless power
has been switched o or the area is known to be nonhazardous.
Caution Do not remove modules unless power has been switched o or
the area is known to be nonhazardous.
Caution Substitution of components may impair suitability for Class I,
Division 2, or Zone 2.
Caution The system must be installed in an enclosure certified for the
intended hazardous (classified) location, having a tool secured cover/door,
where a minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in Europe and
Internationally
The NI 9852 has been evaluated as Ex nA IIC T4 Gc equipment under
DEMKO 03ATEX 0626664X and is IECEx UL 14.0089X certified. Each NI 9852 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 9852 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 Transient protection shall be provided that is set at a level not
exceeding 140% of the peak rated voltage value of 85 V at the supply
terminals to the equipment.
Caution The system shall only be used in an area of not more than
Pollution Degree 2, as defined in IEC/EN 60664-1.
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NI-9852 Getting Started
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.
Wiring the NI 9852
The NI 9852 has two 9-pin male D-Sub connectors that provides connections to a
CAN bus. Each port on the NI 9852 has pins for CAN_H and CAN_L, to which you
connect the CAN bus signals. Connect these signals using twisted-pair cable.
Each port has two isolated common pins (COM) that are internally connected to the
module’s isolated reference and serve as the reference ground for CAN_H and
CAN_L. You can connect the CAN bus reference ground (sometimes referred to as
CAN_V-) to one or both COM pins. The port also has an optional shield pin, SHLD,
that you can connect to a shielded CAN cable. Connecting SHLD may improve signal
integrity and EMC performance in a noisy environment.
Both of the ports on the NI 9852 require an external power supply of +8 to +25 V to
operate. Supply power from the CAN bus to the VSUP0 pin on CAN0, and the VSUP1
pin on CAN1.
Pinouts for CAN0 and CAN1 of the NI 9852 are listed in Tables 1 and 2.
Connector Pin Signal
1 No Connection (NC)
2 CAN_L
3 COM0
4 NC
5 SHLD
6 COM0
7 CAN_H
8 NC
9 VSUP0
Table 1. Pin Assignments for CAN0
© National Instruments 5
NI-9852 Getting Started
Connector Pin Signal
1 No Connection (NC)
2 CAN_L
3 COM0
4 NC
5 SHLD
6 COM0
7 CAN_H
8 NC
9 VSUP0
Table 2. Pin Assignments for CAN1
CAN Bus Topology and Termination
A CAN bus consists of two or more CAN nodes cabled together. The CAN_H and
CAN_L pins of each node are connected to the main CAN bus cable through a short
connection known as a “stub.” The pair of signal wires, CAN_H and CAN_L,
constitutes a transmission line. Every device on a low-speed/fault-tolerant CAN
network requires a termination resistor for each CAN data line: RRTH for CAN_H and
RRTL for CAN_L.
Figure 1 shows a simplified diagram of a low-speed/fault-tolerant CAN bus with
termination resistor placements.
Figure 1. CAN Bus Topology and Termination Resistor Locations
Connecting a CAN Bus to the NI 9852
You can connect each port of the NI 9852 to any location on a CAN bus. Figure 2
shows one example of connecting CAN0 of the NI 9852 directly to one CAN node,
and CAN1 directly to another CAN node. CAN0 and CAN1 require an external power
supply on the CAN bus.
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NI-9852 Getting Started
Figure 2. Connecting Both Ports of the NI 9852 to CAN Buses
Cable Specifications
Cables should meet the physical medium requirements specified in ISO 11898,
shown in the following table. Belden cable (3084A) meets all these requirements
and should be suitable for most applications.
Characteristic Value
Length-related resistance 90 mΩ/m nominal
Length-related capacitance: CAN_L and ground, CAN_H and ground, CAN_L
and CAN_H
30 pF/m nominal
Table 3. ISO 11898 Specifications for Characteristics of a CAN_H and CAN_L Pair of Wires
Determining the Necessary Termination Resistance for the Board
Unlike High-Speed CAN, Low-Speed/Fault-Tolerant CAN requires termination at the
Low-Speed/Fault-Tolerant CAN transceiver instead of on the cable itself. Termination
requires two resistors, RTH for CAN_H and RTL for CAN_L. This configuration allows
the Philips Fault-Tolerant CAN transceiver to detect and recover from bus faults. It is
important to determine the overall termination of the existing network, or the
termination of the individual device, before connecting it to a Low-Speed/Fault-
Tolerant port. Philips recommends an overall RTH and RTL termination of 100 to
500 Ω (each) for a properly terminated low-speed network.
Termination on the low-speed/fault-tolerant ports of the NI 9852 is set through the
NI 985x soware to either 1 kΩ or 5 kΩ.
Number of CAN Nodes
The maximum number of nodes depends on the electrical characteristics of the
nodes on the network. If all of the nodes meet the requirements of Low-Speed/
Fault-Tolerant CAN, up to 32 nodes may be connected to the bus.
© National Instruments 7
NI-9852 Getting Started
NI 9852 Hardware Overview
The NI 9852 has two full-featured, independent CAN ports that are isolated from
each other, and from the other modules in the system. Each port on the NI 9852 has
a Philips SJA1000 controller that is CAN 2.0B-compatible and fully supports both 11-
bit and 29-bit identifiers. The port also has a Philips TJA1054A Low-Speed/Fault-
Tolerant CAN transceiver that is fully compatible with the ISO 11898 standard and
supports baud rates up to 125 Kbps.
Figure 3. NI 9852 Hardware Overview
NI 9852 Specifications
The following specifications are typical for the range -40 °C to 70 °C unless otherwise
noted.
Low-Speed/Fault Tolerant CAN Characteristics
Transceiver Philips TJA1054A
Max baud rate 125 Kbps
CAN_H, CAN_L bus lines voltage -27 to +40 VDC
Supply voltage range (VSUP0/VSUP1)
CAN0 +8 to +36 VDC
CAN1 +8 to +36 VDC
RRTH 1.11 kΩ ± 0.5% or 4.99 kΩ ± 0.5%
RRTL 1.11 kΩ ± 0.5% or 4.99 kΩ ± 0.5%
MTBF 1,052,836 hours at 25 °C; Bellcore Issue 6, Method 1, Case 3,
Limited Part Stress Method
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NI-9852 Getting Started
Note Contact NI for Bellcore MTBF specifications at other temperatures
or for MIL-HDBK-217F specifications.
Power Requirements
Power consumption from chassis
Active Mode
Transmitting 400 mW max
Receiving 400 mW max
Sleep mode 25 µW max
Thermal dissipation (at 70 °C)
Active mode 1.5 W max
Sleep mode 1.2 W max
Physical Characteristics
Dimensions Visit ni.com/dimensions and search by module number.
Weight Approximately 144 g (5.0 oz)
Safety Voltages
Connect only voltages that are within the following limits:
Maximum Voltage[1]
Port-to-COM -27 V DC to +40 V DC maximum, Measurement Category I
External power supply (Vsup)
Isolation
Port-to-port
© National Instruments 9
NI-9852 Getting Started
Continuous 60 V DC, Measurement Category I up to 5,000 m altitude
Withstand 500 V RMS, verified by a 5 s dielectric withstand test
Port-to-earth ground
Continuous 60 V DC, Measurement Category I up to 5,000 m altitude
Withstand 500 V RMS, verified by a 5 s dielectric withstand test
1 The maximum voltage that can be applied or output between any port or VSUP
terminal and a COM terminal without creating a safety hazard.
Safety Compliance and Hazardous Locations Standards
This product is designed to meet the requirements of the following electrical
equipment safety standards for measurement, control, andlaboratory use:
■IEC 61010-1, EN 61010-1
■UL 61010-1, CSA C22.2 No. 61010-1
■EN 60079-0, EN 60079-7
■IEC 60079-0, IEC 60079-7
■UL 60079-0, UL 60079-7
■CSA C22.2 No. 60079-0, CSA C22.2 No. 60079-7
Note For safety certifications, refer to the product label or the Product
Certifications and Declarations section.
Hazardous Locations
U.S. (UL) Class I, Division 2, Groups A, B, C, D, T4; Class I, Zone 2, AEx nA IIC T4 Gc
Canada (C-UL) Class I, Division 2, Groups A, B, C, D, T4; Class I, Zone 2, Ex nA IIC T4 Gc
Europe (DEMKO) Ex nA IIC T4 Gc
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NI-9852 Getting Started
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