National Instruments NI 9853 User manual

GETTING STARTED GUIDE

NI 9853

2-Port, High-Speed CAN Module

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This document explains how to connect to the NI 9853.

The NI 9853 module requires the latest NI 985x software to be

installed. The latest version of the NI 985x software is at ni.com/

downloads.

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 9853. 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 9853 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.

2| ni.com | NI 9853 Getting Started Guide

Caution Do not operate the NI 9853 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

way. If the product is damaged, return it to NI for

repair.

Safety Guidelines for Hazardous Locations

The NI 9853 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 9853 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.

NI 9853 Getting Started Guide | © National Instruments | 3

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.

Caution For Zone 2 applications, install a protection

device between the CAN signals and the NI 9853 CAN

pins. The device must prevent the CAN Port-to-COM

voltage from exceeding 55 V if there is a transient

overvoltage condition.

Special Conditions for Hazardous Locations Use in

Europe and Internationally

The NI 9853 has been evaluated as Ex nA IIC T4 Gc equipment

under DEMKO Certificate No. 03 ATEX 0324020X and is

IECEx 14.0089X certified. Each NI 9853 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 9853 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.

4| ni.com | NI 9853 Getting Started Guide

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.

Wiring the NI 9853

The NI 9853 has two 9-pin male D-Sub connectors that provide

connections to a CAN bus. Each port on the NI 9853 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 common pins (COM) that are internally

connected to the module’s isolated reference and serve as the

NI 9853 Getting Started Guide | © National Instruments | 5

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.

CAN0 of the NI 9853 is internally powered, and therefore

requires no external power supply. CAN1 requires an external

power supply of +8 to +25 V to operate. Supply power to the

VSUP pin of CAN1 from the CAN bus.

Note Although CAN0 of the NI 9853 does not require

an external power supply to operate, it can be

connected to a powered CAN bus without being

damaged.

Pinouts for CAN0 and CAN1 of the NI 9853 are listed in

Tables 1 and 2.

Table 4 lists recommended termination resistor values.

6| ni.com | NI 9853 Getting Started Guide

Table 1. Pin Assignments for CAN0

Connector Pin Signal

1 No Connection (NC)

2 CAN_L

3 COM

4 NC

5 SHLD

6 COM

7 CAN_H

8 NC

9 NC

NI 9853 Getting Started Guide | © National Instruments | 7

Table 2. Pin Assignments for CAN1

Connector Pin Signal

1 No Connection (NC)

2 CAN_L

3 COM

4 NC

5 SHLD

6 COM

7 CAN_H

8 NC

9 VSUP

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

8| ni.com | NI 9853 Getting Started Guide

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. If the transmission line is not terminated,

each signal change on the bus causes reflections that may cause

communication errors. Because the CAN bus is bidirectional,

both ends of the cable must be terminated. However, this

requirement does not mean that every node on the bus should

have a termination resistor; only the two nodes at the far end of

the cable should have termination resistors.

Figure 1 shows a simplified diagram of a CAN bus with multiple

CAN nodes and proper termination resistor (Rt) locations.

NI 9853 Getting Started Guide | © National Instruments | 9

Figure 1. CAN Bus Topology and Termination Resistor Locations

CAN

Node

CAN

Node

CAN

Node

RtRt

CAN

Node

CAN_H

CAN_L

CAN_H

CAN_L

CAN_H

CAN_L

CAN_H

CAN_L

Bus Cable Length

Stub

Length

Connecting a CAN Bus to the NI 9853

You can connect each port of the NI 9853 to any location on a

CAN bus. Figure 2 shows one example of connecting CAN0 of

the NI 9853 directly to one CAN node, and CAN1 directly to

10 | ni.com | NI 9853 Getting Started Guide

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