Omega Engineering DIN-190 Series User manual

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User’s Guide
DIN-190 and DIN-192 Series
Converter Boxes
MADE IN
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Servicing North America:
U.S.A.: One Omega Drive, Box 4047
ISO 9001 Certified Stamford, CT 06907-0047
Tel: [phone] FAX: [phone]
e-mail: [email protected]
Canada: 976 Bergar
Laval (Quebec) H7L 5A1, Canada
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e-mail: [email protected]
For immediate technical or application assistance:
U.S.A. and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA®
Customer Service: 1-800-622-2378 / 1-800-622-BEST®
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN®
Mexico: En Espan˜ol: [phone]-7803 e-mail: [email protected]
FAX: [phone] [email protected]
Servicing Europe:
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Toll Free in Benelux: 0800 0993344
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Toll Free in France: 0800 466 342
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Tel: [phone] FAX: [phone]
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Toll Free in United Kingdom: 0800-488-488
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OMEGAnet®Online Service Internet e-mail
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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: [email protected]
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.

3DIN-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. RS-
485 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.

DIN-191 & DIN-192 USERS MANUAL 4
SPECIFICATIONS
Max common mode voltage: 500Vrms, 60s duration.
Baud rates: 300, 600, 1200, 2400, 4800, 9600, 19200,
38400, 57600, 115200 (Dip -switch selectable).
Temperature range (operating & storage): -25 to +70°C.
Relative humidity: 0 - 95% noncondensing.
Warranty: 12 months on workmanship and materials.
Power Specifications
Power requirements: Regulated +5Vdc.
Power consumption: 1.0W Max (RS-485 driver on).
MECHANICALS AND DIMENSIONS
Case: ABS case with screw terminal barrier plug (supplied.
RS-485 Connectors: Phoenix screw terminal barrier plug (supplied).
Replace with Phoenix MSTB 2.5/4 ST 5.08 or equivalent.
Warranty: 12 months on workmanship and materials.
DIN-191 CONNECTORS
The DIN-191 contains two connectors: a four-pin screw terminal plug and
a female DB-9 RS-232 connector.
The four -pin screw terminal plug pin designations are located on the
label of each module. The screw terminals will accept up to #14 gauge
wire (AWG). This connector is used for +5.0Vdc regulated power supply
input and the RS-485 data lines.

5DIN-191 & DIN-192 USERS MANUAL
The DIN-191 female RS-232 connector utilizes five connections:
Transmit pin 2
Receive pin 3.
Ground pin 5.
Data Set Ready (DSR) pin 6
Clear To Send (CTS) pin 8
Both the Data Set Ready (DSR) input pin #6 and Clear To Send (CTS)
input pin #8 are internally biased to their active state thru a 330Ωresistor
to +5Vdc.
To easily connect to any host PC computer, a straight thru RS-232 cable
can be used. The RS-232 input Ground and signals are isolated by up to
500VRMS from the power supply ground. Cable CA-1 is a male-to-male
DB-9 communications cable available for purchase from us.
Figure 1A Connections for DIN-191.
An RS-485 repeater is necessary to extend the length of an RS-485
network, or connect more than 32 RS-485 devices on an RS-485
network.
The DIN-192 repeater contains a seven-pin screw terminal plug. The pin
designations are located on the label of each module. The screw
terminals will accept up to #14 gauge wire (AWG). This connector is used
for +5.0Vdc regulated power supply input and both pairs of RS-485 data
lines. The isolated RS-485 input data lines are clearly marked and their
ground reference is isolated by up to 500VRMS from the power supply
ground. The isolated RS-485 input data lines should be attached to the
end of an existing RS-485 network. The serial data received on the

DIN-191 & DIN-192 USERS MANUAL 6
isolated RS-485 input data lines will be re-amplified and retransmitted on
the RS-485 OUT data lines.
.
Figure 1B Connections for DIN-192.
BAUD RATE
The DIN-191 and DIN-192 series converters contain a 10-position DIP
switch located on the bottom of each unit. The DIP switch is used to
select the correct communications baud rate and must be set to the same
value as the devices connected to the RS-485 data lines. Each position
on the DIP switch is labeled from 1 to 10. Switch position 1 selects 300
baud. Switch positions 2 thru 9 select standard baud rates from 600 to
57.6K respectively. Switch position10 selects 115.2K baud rate. Only
one baud rate switch may be turned on (up position) at one time for
proper operation.
RS-485 TERMINATIONS
The proper termination techniques for any RS-485 system require two
biasing resistors and two termination resistors. The 1kΩbiasing resistors
are connected from the DATA line to +5Vdc and from the DATA* line to
ground. The biasing resistors and are normally positioned at the HOST
end of the cable. The RS-485 standard also requires two resistors across
the data lines for proper termination. Two 220Ωresistors should be
connected between the DATA and DATA* lines. The resistors should be
placed at each end of the RS-485 cable. Please refer to Figure 2 for a
typical RS-485 system application.
The DIN-191 and DIN-192 each contain the biasing and termination
resistors necessary to interface any equipment on an RS-485 network.
These resistors are jumper-selectable making it easier to interface the
DIN-191 and DIN-192 to other pieces of equipment that may or may not
contain the biasing and/or termination resistors.
RS-485
Output
RS-485
Input

7DIN-191 & DIN-192 USERS MANUAL
Figure 2. RS-485 biasing & termination resistors.
RS-485 TERMINATION & BIASING SETTINGS
Proper termination and biasing of any RS-485 based system can be
performed by properly enabling the correct resistors inside each DIN-191
or DIN-192. Figures 3.0 and 4.0 show the location of the jumpers on the
printed circuit board. The jumpers are shown in their factory set locations
to enable the selected resistors. Insert or remove the jumpers as required
to properly terminate any RS-485 system.
Figure 3. DIN-192 jumper locations.

DIN-191 & DIN-192 USERS MANUAL 8
FIGURE 4. DIN-192 jumper locations.
FACTORY RS-485 TERMINATION SETTINGS
Each DIN-191 and DIN-192 contains internal pin strips for enabling the
internal termination and biasing resistors. Each pc board is clearly marked
with the jumper designators adjacent to each row of pins. The jumper
designators are +1K, 220 and -1K. To enable any resistor, place a jumper
over the pins next to the required designator. The factory switch and
jumper settings are outlined below.
DIN-191:
Baud Rate: 300 baud switch up.
Biasing Resistors: +1K, -1K jumpers installed.
Termination Resistor: 220 jumper installed.
DIN-192:
Baud Rate: 300 baud switch up.
RS-485 (J3): Biasing Resistors: +1K, -1K jumpers installed.
Termination Resistor: 220 jumper installed.
Isolated RS-485 (J2): Biasing Resistors: +1K, -1K jumpers installed.
Termination Resistor: 220 jumper not installed.

WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and
workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an
additional one (1) month grace period to the normal one (1) year product warranty to cover
handling and shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be
repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting
from any action of the purchaser, including but not limited to mishandling, improper interfacing,
operation outside of design limits, improper repair, or unauthorized modification. This
WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence
of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibra-
tion; improper specification; misapplication; misuse or other operating conditions outside of
OMEGA’s control. Components in which wear is not warranted, include but are not limited to
contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability
for any damages that result from the use of its products in accordance with information
provided by OMEGA, either verbal or written. OMEGA warrants only that the parts
manufactured by the company will be as specified and free of defects. OMEGA MAKES
NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES
INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of pur-
chaser set forth herein are exclusive, and the total liability of OMEGA with respect to this
order, whether based on contract, warranty, negligence, indemnification, strict liability or
otherwise, shall not exceed the purchase price of the component upon which liability is
based. In no event shall OMEGA be liable for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as
a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity;
or (2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language,
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability
or damage whatsoever arising out of the use of the Product(s) in such a manner.
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be
marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.
FOR WARRANTY RETURNS, please have
the following information available BEFORE
contacting OMEGA:
1. Purchase Order number under which
the product was PURCHASED,
2. Model and serial number of the product
under warranty, and
3. Repair instructions and/or specific
problems relative to the product.
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:
1. Purchase Order number to cover the
COST of the repair,
2. Model and serial number of the
product, and
3. Repair instructions and/or specific problems
relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible.
This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2005 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without
the prior written consent of OMEGA ENGINEERING, INC.

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