National Instruments NI 9866 Manuale utente

GETTING STARTED GUIDE

NI 9866

1-Port, LIN Module

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This document explains how to connect to the NI 9866.

The NI 9866 module requires the latest software to be installed.

The latest version of the 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 9866. 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 9866 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 9866 Getting Started Guide

Caution Do not operate the NI 9866 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 9866 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 9866 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 9866 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 LIN signals and the NI 9866 LIN

pins. The device must prevent the LIN 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 9866 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 9866 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 9866

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 9866 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 9866

The NI 9866 has one 9-pin male D-Sub connector that provides

connections to a LIN bus.

The port has two common pins (COM) that are internally

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

reference ground for LIN signal. You can connect the LIN bus

reference ground to one or both COM pins. The port also has an

NI 9866 Getting Started Guide | © National Instruments | 5

optional shield pin, SHLD, that you can connect to a shielded

LIN cable. Connecting SHLD may improve signal integrity and

EMC performance in a noisy environment.

Caution You must use a UL listed ITE power supply

marked LPS with the NI 9866.

The NI 9866 requires an external power supply of +8 to +18 V to

operate. Supply power to the NI 9866 VSUP pin from the LIN

bus.

Note Power on VSUP is required for LIN operation.

The NI 9866 pinout is listed in Table 1.

6| ni.com | NI 9866 Getting Started Guide

Table 1. Pin Assignments for the NI 9866

Connector Pin Signal Name

1 No Connection (NC)

2 NC

3 COM

4 NC

5 SHLD

6 COM

7 LIN

8 NC

9 VSUP

NI 9866 Getting Started Guide | © National Instruments | 7

Cabling Requirements for the NI 9866

This section deals with cabling specifications, termination

resistors, cable lengths, and the number of LIN nodes that can

exist in a system.

Cable Specifications

LIN cables should meet the physical medium requirement of a

bus RC time constant of 5 µs. For detailed formulas for

calculating this value, refer to the Line Characteristics section of

the LIN specification. Belden cable (3084A) and other

unterminated CAN/Serial quality cables meet these requirements

and should be suitable for most applications.

Cable Lengths

The maximum allowable cable length is 40 m, per the LIN

specification.

Number of LIN Devices

The maximum number of devices on a LIN bus is 16, per the LIN

specification.

8| ni.com | NI 9866 Getting Started Guide

Termination Resistors

LIN cables require no termination, as nodes are terminated at the

transceiver. Slave nodes typically are pulled up from the LIN bus

to VBat with a 30 kΩ resistance and a serial diode. This

termination usually is integrated into the transceiver package.

The master node requires a 1 kΩ resistor and serial diode

between the LIN bus and VBat. On NI-XNET LIN products,

master termination is software selectable; you can enable it in the

API with the NI-XNET Session Interface:LIN:Termination

property.

NI 9866 Hardware Overview

The NI 9866 has one full-featured LIN port that is isolated from

the other modules in the system. The port has a LIN controller

that is fully compliant with the LIN 1.3/2.0/2.1/2.2 Specification.

The port also has an NXP TJA1028 LIN transceiver that is fully

compatible with the LIN 1.3/2.0/2.1/2.2 and SAE J2602 standard

and supports baud rates up to 20 kbps.

NI 9866 Getting Started Guide | © National Instruments | 9

Figure 1. NI 9866 Hardware Overview

Ext Pwr

Supply

Required

LIN

Controller LIN

LIN

Transceiver

COM

Vsup

NI 9866 Specifications

The following specifications are typical for the range -40 °C to

70 °C unless otherwise noted.

10 | ni.com | NI 9866 Getting Started Guide

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