Bb-electronics 485LDRC - Datasheet Manuel d'utilisateur télécharger pdf

485LDRC-0812-1/3

www.bb-elec.com [email protected] [email protected]

International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104

European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445

PRODUCT INFORMATION B&B ELECTRONICS

Models 485DRC and 485LDRC

Industrial DIN Rail Mounted

Optically Isolated RS-232 to

RS-422/485 Converters

With Surge Suppression

Introduction

The DIN Rail mountable Models 485DRC and 485LDRC optically isolate and convert unbalanced, full or half-duplex

RS-232 signals to optically isolated, balanced, full or half-duplex RS-422 or RS-485 signals at baud rates up to 115.2

kbps. These units also surge suppress the RS-422/485 lines. They feature Send Data Control circuitry so no software

control of handshake lines is required in RS-485 mode.

LEDs

The 485LDRC includes all the above features plus 3 LED’s: one indicating RS-485 Transmit Data, one for RS-485

Receive Data, and one for power.

Description

The 485DRC/485LDRC has screw down terminal blocks on the RS-232 side and the RS-422/RS-485 side. Transmit

(TD), Receive (RD) and Ground are supported on the RS-232 side. The unit is powered by a supply voltage of 10 to

30VDC on the RS-232 side, useful where 24VDC is commonly found. Transmit Data A (-), Transmit Data B (+), Receive

Data A (-), Receive Data B (+), and Ground are supported on the RS-422/RS-485 side. Communication features on the

485DRC/485LDRC are dipswitch selectable on the unit.

RS-485 Mode with Send Data Control

Send Data Control recognizes the first bit of data from the RS-232 side, enables the transmitter and disables the

receiver. After the last bit of data is sent from the RS-232 side, the timeout waits one character length, then disables the

transmitter and enables the receiver. The timeout can be selected with dipswitches or by changing the value of R11 (see

Table 2). If the system requires the line to be “turned around” faster, i.e. the slave device starts responding before the

transmitter of the 485DRC/485LDRC is disabled, R11 can be changed to meet the specific baud rate. Termination

resistance can be selected with Switch 5 for high baud rates and long cable distances. See B&B Electronics’ RS-422/485

Application Note available on the website or by mail. Factory setting: 9600 baud.

Table 1. Typical Communication Setups

Switch 1

TX Enable

Switch 2

RX Enable

Switch 3

2/4 Wire

Switch 4

2/4 Wire

RS-485 2-Wire Mode

(half-duplex)

RS-485 4-Wire Mode

(full-duplex)

OFF

RS-422 Mode

(full-duplex)

OFF

Table 2. Baud Rate Selection

Switch

R11

Time (ms)

1200

OFF

820k

8.33

2400

OFF

Not Used

4.16

4800

OFF

Not Used

2.08

9600

OFF

Not Used

1.04

19200

Not Used

.580

38400

OFF

27k

.260

57600

OFF

16k

.176

115200

OFF

8.2k

.0868

In a two-wire setup, switches 3 & 4 should be “ON”, making terminal block (G)

the Data (–) line and terminal block (H) the Data (+) line.

TYPICAL TWO-WIRE RS-485 SETUP

Generator

Receiver

Circuit ground

DATA +

(TERMINAL BLOCK H)

GND

(TERMINAL BLOCK M)

DATA -

(TERMINAL BLOCK G)

485DRC/485LDRC

TYPICAL RS-422/485 4 WIRE

SETUP

GND

(TERMINAL BLOCK M)

TD A -

(TERMINAL BLOCK G)

TD B +

(TERMINAL BLOCK H)

RD A -

(TERMINAL BLOCK K)

RD B +

(TERMINAL BLOCK L)

Receiver

Circuit ground

Generator

ENABLE

485DRC/485LDRC

1 2 3

Résumé du contenu

Page 1 - RS-422/485 Converters

Page 2 - Switch Settings (UP = ON)

Page 3 - Specifications

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