B&B Electronics 485DRCI-PH Manuale utente

1Set DIP Switches

Communications Mode

Switch 1 2 3 4

RS-485 2-Wire

Half Duplex ON ON ON ON

RS-485 4-Wire

Full Duplex ON OFF OFF OFF

RS-422 Full Duplex OFF OFF OFF OFF

Product Overview

Wire the Converter

SWITCH POSITION 8 IS NOT USED

For an explanation of RS-485 termination and

biasing requirements, refer to B&B Electronics’

RS-485 application note. This publication can

be downloaded at: www.bb-elec.com

Built-In Termination Resistor Switch

Use built-in 120Ω Termination ON

Use External or No Termination OFF

Built-In Transmit Bias Resistor Switch

Use External or No Bias Resistor ON

Use built-in 1.2K Ω Transmit Bias Resistor OFF

Built-In Receive Bias Resistor Switch

Use External or No Bias Resistor ON

Use built-in 1.2K Ω Receive Bias Resistor OFF

DB9 Pinout

DIP Switch RS-422/485 4-Wire

1234567

On/Off OFF OFF OFF *** *** ***

Position 1 = ON for RS-485, OFF for RS-422

Positions 5,6,7 are used for termination and biasing

DIP Switch RS-485 2-Wire

1234567

ON ON ON ON x x x

Positions 5,6,7 are used for termination and biasing

3Loopback Test

Conﬁgure for RS-485 Four wire. Jumper terminals A to C and

B to D. Connect a PC to the RS-232 port (see Step 3). Using

HyperTerminal or similar program, connect to the appropriate

COM port. Turn off HyperTerminal local Echo. Transmit data.

The same data should be returned. When data is sent and

looped back, the TD and RD LED’s will blink on both ports.

4Check LEDs

Data

LEDs

Power

LED

DB9

Port

Data

LEDs

Terminal

Block

DIP

Switches

10 to 48 VDC

1.9 W Max

Grounding the unit is recommended

Connect a grounding wire from the

ground lug

Ground

lug

Terminal RS-485 2-Wire RS-422/485

4-Wire

A *** TDA (-)

B *** TDB (+)

C Data A (-) RDA (-)

D Data B (+) RDB (+)

E GND GND

LEDs

Power

LED

Red. ON when power is

applied

Data

LEDs

Green, LEDs ﬂash when data

is present on the port

Troubleshooting

Fast, Easy Answers...

Connecting a Signal Ground

(common, reference) on the RS-422/485 side. The speciﬁcations

for most RS-422 and RS-485 devices indicate that the device

can withstand a maximum VCM of -7 volts to +12 volts. The

function of the GND connection is to tie the signal grounds of

all nodes on a network to one common ground potential. This

ensures that the common mode voltage cannot exceed the

speciﬁed value.

A signal ground is required on the 485DRCI-PH because it is

an optically isolated device. If you do not have a signal ground

(common, reference) on your RS422/485 device, you can

connect to the DC power ground of your RS422/485 device.

Caution: Make sure that this is connected correctly.

Note: Do not use the shield drain wire as the

signal ground between RS-422/485 devices.

Information – UL Class 1 Div 2

1. Refer to the Nonincendive Field Wiring

Apparatus Control Drawing for important

information.

2. Power, Input / output (I/O) wiring

for the end use enclosure must be in

accordance with Class 1 Division 2 wiring

methods (Article 501.10(B) of the National

Electric Code, NFPA 70) and in accordance

with the local authority having jurisdiction.

3. Maximum ambient air temperature

85°C.

4. Temperature rating of ﬁeld installed

conductors 105°C. Use Copper Wire Only.

5. These devices must be installed in end

use enclosure suitable for the location.

6. WARNING – EXPLOSION HAZARD

SUBSTITUTION OF COMPONENTS MAY

IMPAIR SUITABILITY FOR CLASS 1,

DIVISION 2.

7. WARNING – EXPLOSION HAZARD:

DO NOT DISCONNECT EQUIPMENT

UNLESS POWER HAS BEEN SWITCHED

OFF OR THE AREA IS KNOWN TO BE

NON-HAZARDOUS.

8. WARNING – THIS APPARATUS IS

SUITABLE FOR USE IN CLASS 1 DIVISION 2,

GROUPS A, B, C, AND D OR NONHAZARDOUS

LOCATIONS ONLY.

Fast and easy on the web:

www.bb-elec.com

Triple Isolated RS-232 to

RS-422/485 Converter

485DRCI-PH

1-888-948-2248 | Europe: +353 91 792444

www.bb-elec.com

Recommended Accessories

DRAD35

DIN Rail Adapter

http://www.bb-elec.com/

Products/Power-Supplies-

Accessories/Serial-Cables/

Accessories.aspx

Please double check

Step 2.

You can also use your

smart phone to access

complete documentation

on our website. Simply

scan code to the right.

485DRCI-PH

Additional Items Required but Not

Included:

First Things First...

Before you begin, be sure you have

the following:

707 Dayton Road | PO Box 1040 | Ottawa, IL 61350

Phone: 815-433-5100 | Fax: 815-433-5109

www.bb-elec.com | E-mail: [email protected]

•

Quick

Start

Guide

MDR-20-24

Power Supply

http://www.bb-elec.com/Products/

Power-Supplies-Accessories/DIN-

Power-Supplies/Industrial-Slimline-

Power-Supplies.aspx

A 10 to 48 VDC Power Supply,.

(Converter draws 1.9 W Max.)

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