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B&B Electronics 485LDRC9 - Quick Start Guide User Manual

Product overview, Termination switch, Set the dipswitch settings for baud rate

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Set The 422/485 Side of Converter

Connect Your RS232 Device

(Terminal Block OR DB9 Port)

Computer

Termination Switch:

Set to OFF (Recommended)

Switch 5

If you want to enable termination,

refer to:

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

485LDRC9

Set the Dipswitch Settings for Baud Rate

For baud rates not listed above refer to:

http://www.bb-elec.com/485LDRC9

Additional tech notes on RS232 DTE DCE connections

are located at:

http://www.bb-elec.com/tech/DTE-DCE

Loopback Test

(Optional)

To verify serial port and 485LDRC9 functionality

• Configure for RS-485 four wire,

9600 baud.

• Jumper terminals H to L and G to K.

• Connect a PC to the RS-232 port

(see Step 1).

• Using HyperTerminal or similar program,

connect to the appropriate COM port

(remember to set the baud rate at 9600).

Turn off HyperTerminal local echo.

• Start typing. If you can see the data

you are typing, you have a good loop-

back. If you cannot, contact tech support.

• LED Indicators: Power is ON when power

is applied. TD flashes when RS-422/485

data is sent. RD flashes when RS-422/485

data is received.

Set DIP

Switches to:

Your Device

485LDRC9

• Use a straight through DB9 to DB9 if you are

connecting to a computer (DTE).
• Use a cross over (null modem) DB9 to DB9

if you are not connecting to a computer. (DCE)

Additional tech notes on 422/485 are located at:

http://www.bb-elec.com/485LDRC9

Product Overview

Terminal Block

Connectors

A – F

Terminal Block
Connectors
G – M

DB9 F PINS

DIP Switches

1 – 8

Top View

(232 and Power Side)

Bottom View

(422/485 Side)

Connect Your Power Supply

External Power

Supply

Terminal C:

(Ground/V (–)

Terminal F:

V (+)

Field Device

Your Device

485LDRC9

Please Note:

Terminal block and DIP switch settings located on product.

2 Wire 485

4 Wire 485/422

Your Device

Your Device

485LDRC9

485LDRC9

DTE

DCE

Converter uses 0.5 W

RS-485 4-Wire

G

K

DATA
B (+)

DATA

A (-)

GND

H

L

J

M

G

TDB (+)

TDA (-)

RDB (+)

RDA (-)

GND

K

H

L

J

M

D

TD

RD

A

E

B

F

C

GND

D

TD

RD

GND

A

E

B

F

C

L

K

H

G

1
2
3
4
5
6
7
8

ON

ON

OFF
OFF
OFF
OFF

OFF
OFF

SW-1

SW-2

SW-3

SW-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

SW-6

SW-7

SW-8

Timeout (MS)

2400

OFF

OFF

ON

4.16

4800

OFF

ON

OFF

2.08

9600

ON

OFF

OFF

1.04

19.2K

ON

ON

ON

0.580

Use the 120Ω

Built-in Termination

ON

Use External or

No Termination

OFF

2

1

5

4

3

6