Bb-electronics 485DRCI - 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

Pre-deﬁned timeouts are set using switches 8

through 12. Resistor selectable baud rates are set

by inserting a through hole resistor (R-11) on the

circuit board. Timeout selections are equal to one

character time at the indicated baud rate. Setting the

converter to 9600 will generally work at 9600 and

higher baud rates. In RS-422 mode, timeouts are not

required.

RS-422/485 Timeout

RD LED

DB9 Port

Terminal

Block

TD LED

Power LED

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 OFF

Use built-in 1.2K Ω Transmit Bias Resistor ON

Built-In Receive Bias Resistor Switch

Use External or No Bias Resistor OFF

Use built-in 1.2K Ω Receive Bias Resistor ON

DB9 Pinout

GND

Data B (+)

Data A (+)

GND

RDB (+)

RDA (-)

TDB (+)

TDB (-)

Your Device

485DRCI 485DRCI

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

Switch Selectable

Baud

(Kbps)

8 9 10 11 12

Timeout

(ms)

2.4 ON OFF OFF OFF OFF 4.37

4.8 OFF ON OFF OFF OFF 2.03

9.6 OFF OFF ON OFF OFF 1.02

19.2 OFF OFF OFF ON OFF 0.57

38.4 OFF OFF OFF OFF ON 0.27

Resistor Selectable

Baud

(Kbps)

8 thru 12 R11 Value

Timeout

(ms)

1.2 OFF 820 KΩ 8.32

57.6 OFF 16 KΩ 0.16

115.2 OFF 8.2 KΩ 0.08

Loopback Test

Conﬁgure for RS-485 Four wire,

9600 baud. Jumper terminals B to

D and C to E. Connect a PC to the

RS-232 port Using HyperTerminal

or similar program, connect to the

appropriate COM port.

(Remember to set the baud rate to

9600.) Turn off HyperTerminal local

echo. Transmit data. The same data

should be returned.

10 to 48 VDC, 0.2 A

485DRCI

Check LEDs

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
First Things First 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 - First Things First

Fast, Easy Answers... Information – UL Class 1 Div 21. Power, input /output (I/O) wiring must be in accordance with Class 1 Division 2 wiring methods

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Bb-electronics 485DRCI - Quick Start Guide User Manual

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

Summary of Contents

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