Bb-electronics 485DRCI-PH - Quick Start Guide User Manual download pdf

Set 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

GND

Data A (+)

Data B (+)

TDA (-)

TDB (+)

RDA (-)

RDB (+)

GND (-)

Your Device

485DRCI-PH 485DRCI-PH

RS-485 2-Wire

RS-422/485 4-Wire

DIP Switch RS-422/485 4-Wire

1 2 3 4 5 6 7

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

Positiobs 8 -12 are used to set baud rate

DIP Switch RS-485 2-Wire

1 2 3 4 5 6 7

ON ON ON ON x x x

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

Positions 8 -12 are used to set baud rate

Loopback 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.

Check 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

1 2

Product Overview 1
485DRCI-PH 2

Summary of Contents

Page 1 - Product Overview

1Set DIP Switches 2Communications ModeSwitch1 2 3 4RS-485 2-WireHalf DuplexON ON ON ONRS-485 4-WireFull DuplexON OFF OFF OFFRS-422 Full DuplexOFF OFF

Page 2 - 485DRCI-PH

TroubleshootingFast, Easy Answers...Connecting a Signal Ground (common, reference) on the RS-422/485 side. The speciﬁcations for most RS-422 and RS-48

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Bb-electronics 485DRCI-PH - Quick Start Guide User Manual

Browse online or download User Manual for Accessories communication Bb-electronics 485DRCI-PH - Quick Start Guide. B&B Electronics 485DRCI-PH - Quick Start Guide User Manual

Summary of Contents

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