National Instruments NI 9852 User manual

GETTING STARTED GUIDE

NI 9852

2-Port, Low-Speed/Fault-Tolerant CAN Module

This document explains how to connect to the NI 9852.

The NI 9852 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 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

Operate the NI 9852 only as described in this document.

Caution Do not operate the NI 9852 in a manner not

specified in this document. Product misuse can result in

a hazard. You can compromise the safety protection

2| ni.com | NI 9852 Getting Started Guide

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 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

and Ex nA IIC T4 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.

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 9852 Getting Started Guide | © National Instruments | 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 Division 2 and Zone 2 applications,

install a protection device between the external power

supply and the Vsup pin. The device must prevent the

Vsup-to-COM voltage from exceeding 50 V if there is

a transient overvoltage condition.

Caution For Zone 2 applications, install a protection

device between the CAN signals and the NI 9852 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 9852 has been evaluated as Ex nA IIC T4 Gc equipment

under DEMKO Certificate No. 03 ATEX 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

4| ni.com | NI 9852 Getting Started Guide

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.

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.

NI 9852 Getting Started Guide | © National Instruments | 5

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.

6| ni.com | NI 9852 Getting Started Guide

Table 1. Pin Assignments for CAN0

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

NI 9852 Getting Started Guide | © National Instruments | 7

Table 2. Pin Assignments for CAN1

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

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 9852 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. 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

RTL CAN_L RTH CAN_H RTL CAN_L RTH CAN_H RTL CAN_L RTH CAN_H

CAN_H

CAN_L

Low-speed/Fault-Tolerant

CAN Device

Low-speed/Fault-Tolerant

CAN Device

Low-speed/Fault-Tolerant

CAN Device

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

NI 9852 Getting Started Guide | © National Instruments | 9

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.

Figure 2. Connecting Both Ports of the NI 9852 to CAN Buses

CAN1

CAN Device

CAN0

NI 9852

CAN

Cable

(With

Optional

Shield)

(SHLD)

CAN_H

CAN_L

Vsup1

COM1

(SHLD)

CAN_H

CAN_L

Vsup1

COM1

CAN Device

CAN

Cable

(With

Optional

Shield)

(SHLD)

CAN_H

CAN_L

Vsup0

COM0

(SHLD)

CAN_H

CAN_L

Vsup0

COM0

–

External

Power

Supply

–

External

Power

Supply

10 | ni.com | NI 9852 Getting Started Guide

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