Omega Products DIN-190 Installation Manual

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User’s Guide

DIN-190 and DIN-192 Series

Converter Boxes

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It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

DIN-191 and DIN-192 SERIES
CONVERTER BOXES
USERS MANUAL

REVISED: 10-30-00

Omega Engineering
One Omega Drive
P O Box 4047
Stamford, CT 06907
Phone: 1-800-DAS-IEEE
Fax: [phone]
e-mail: [e-mail]
www.omega.com

The information in this publication has been carefully checked and is
believed to be accurate; however, no responsibility is assumed for
possible inaccuracies or omissions. Applications information in this
manual is intended as suggestions for possible use of the products and
not as explicit performance in a specific application. Specifications may be
subject to change without notice.

3 DIN-191 & DIN-192 USERS MANUAL

GENERAL DESCRIPTION

The DIN-191 and DIN-192 series converter boxes convert RS-232
communications signal levels to the correct electrical signals required by
RS-485. The RS-485 communications standard is recommended when
many modules, or other addressable devices, must be connected to a
host computer over long distances. The DIN-191 and DIN-192 converters
allow communications bus lengths up to 4,000 meters and baud rates up
to 115K baud using one twisted pair of wires.

The RS-485 communications standard is half-duplex; therefore data can
be transmitted in only one direction at a time. To determine the direction
of data on the RS-485 bus, many products require external handshaking
signals to control the bus direction when transmitting or receiving data.
This technique often requires that host RS-232 software be written, or
modified, to accurately control handshaking signals for proper system
operation. The DIN-191 and DIN-192 automatically control the bus
direction without external handshaking signals from the host. Therefore,
host software written for RS-232 may be used without modification. RS­485 bus control is completely transparent to the user.

The DIN-192 is an RS-485 repeater. Repeaters are required to extend
communications bus lengths or allow more than 32 RS-485 devices to be
connected to a communications bus. A repeater simply re-amplifies, or
boosts, existing RS-485 signals transmitted over long distances.

The DIN-191 and DIN-192 are each isolated between the RS-232 port
and/or RS-485 ports and require a regulated +5Vdc power supply.