National Instruments NI 9871 Manuale utente

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9871

4-Port, RS485/RS422 Serial Module

NI 9871 Operating Instructions 2 ni.com

This document describes how to use the National Instruments 9871

and includes specifications and pin assignments for the NI 9871.

Visit ni.com/info and enter rdsoftwareversion to determine

which software you need for the modules you are using. For

information about installing, configuring, and programming the

system, refer to the system documentation. Visit ni.com/info and

enter cseriesdoc for information about C Series documentation.

Note The safety guidelines and specifications in this

document are specific to the NI 9871. The other

components in your system may not meet the same safety

ratings and specifications. Refer to the documentation for

each component in your system to determine the safety

ratings and specifications for the entire system.

Safety Guidelines

Caution Do not operate the NI 9871 in a manner not

specified in the user manual or operating instructions.

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 National Instruments for repair.

Hot Surface This icon denotes that the component may be

hot. Touching this component may result in bodily injury.

Safety Guidelines for Hazardous Locations

The NI 9871 is suitable for use in Class I, Division 2, Groups A, B,

C, D, T4 hazardous locations; Class I, Zone 2, AEx nA II T4 and

Ex nA II T4 hazardous locations; and nonhazardous locations only.

Follow these guidelines if you are installing the NI 9871 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.

NI 9871 Operating Instructions 4 ni.com

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 Zone 2 applications, install the

CompactRIO system in an enclosure rated to at least

IP 54 as defined by IEC 60529 and EN 60529.

Caution For Zone 2 applications, install a protection

device between the RS232 signal cables and the NI 9871

RJ-50 jacks (ports 1–4). 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 9871 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 Safe Use in Europe

This equipment has been evaluated as Ex nA IIC T4 equipment

under DEMKO Certificate No. 07 ATEX 0626664X. Each module

is marked II 3G and is suitable for use in Zone 2 hazardous

locations.

Special Guidelines for Marine Applications

Some modules are Lloyd’s Register (LR) Type Approved for

marine (shipboard) applications. To verify Lloyd’s Register

certification for a module, visit ni.com/certification and

search for the LR certificate, or look for the Lloyd’s Register mark

on the product label.

Caution In order to meet the EMC requirements for

marine applications, install the module in a shielded

enclosure with shielded and/or filtered power and

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.

NI 9871 Operating Instructions 6 ni.com

Wiring the NI 9871

The NI 9871 has four RJ-50 receptacles that provide connections

for four RS485/RS422 devices.

Table 1. RS485/RS422 Port Pinout

RJ-50 Pin Signal Name*

1No Connect

2TXD–

3TXD+

4RTS–

5CTS–

6RXD–

7RXD+

8RTS+

9CTS+

10 GND

*These signals are shared by all four RJ-50 connectors on the NI 9871.

RJ50 Jack

TXD–

TXD+

RTS –

CTS–

RXD–

RXD+

RTS+

CTS+

COM

The cables included with your kit convert the RJ-50 pinout to the

standard NI pinout, as shown in Table 2.

Table 2. Pin Assignments for RS485/RS422 DB-9 Male Connector

Connector Pin Signal

1GND

2CTS+

3RTS+

4RXD+

5RXD–

6CTS–

7RTS–

8TXD+

9TXD–

NI 9871 Operating Instructions 8 ni.com

You must connect an external power supply to the NI 9871.

This power supply provides the power for the RS485/RS422

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 9871.

Caution To ensure the specified EMC performance, do not

connect the power input to a d.c. mains supply or to any

supply requiring a connecting cable longer than 30 m

(100 ft.). A d.c. mains supply is a local d.c. electricity supply

network in the infrastructure of a certain site or building.

Figure 1. Four-Position External Power Connector

Figure 2 shows the method of power connection to the NI 9871

module. Attach an isolated power supply to the Vsup and COM

terminals using the included pigtail.

SUP 2V

SUP 3COM 4COM

NI 9871 Operating Instructions 10 ni.com

Figure 2. Powering the NI 9871 from an Isolated Power Source

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.

Red (+)

Black (–)

NI P/N 198159-XX:

Female Microfit

Pigtail

V+

V–

Any 8 - 28 V

Isolated

Power Supply

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