Omega DMD-480 User guide

Users Guide

®

An OMEGA Technologies Company

http://www.omega.com

e-mail:[email protected]

DMD-480 Series RS232/485 Bridgesensor

AC Powered Strain Gage to RS232/485

Computer Interface Module

®

Internet e-mailInternet e-mail

Internet e-mail

Internet e-mailInternet e-mail

[email protected][email protected]

[email protected]

[email protected][email protected]

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OMEGAnet

OMEGAnetOMEGAnet

http://wwwhttp://www

http://www

http://wwwhttp://www

omega.com

®®

®

®®

On-Line Service On-Line Service

On-Line Service

On-Line Service On-Line Service

.omega.com.omega.com

.omega.com

.omega.com.omega.com

®

Servicing North America:

USA:USA:

USA: One Omega Drive, Box 4047

USA:USA:

ISO 9001 Certified Stamford, CT 06907-0047

Tel: [phone] FAX: [phone]
e-mail: [email protected]

Canada:Canada:

Canada: 976 Bergar

Canada:Canada:

Laval (Quebec) H7L 5A1
Tel: [phone] FAX: [phone]
e-mail: [email protected]

For immediate technical or application assistance:

USA and Canada:USA and Canada:

USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGASM

USA and Canada:USA and Canada:

Customer Service: 1-800-622-2378 / 1-800-622-BESTSM
Engineering Service: 1-800-872-9436 / 1-800-USA-WHENSM
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA

Mexico andMexico and

Mexico and

Mexico andMexico and
Latin America:Latin America:

Latin America: Tel: [phone] FAX: [phone]

Latin America:Latin America:

En Español: (95) 203-359-7803 e-mail: [email protected]

Servicing Europe:

Benelux:Benelux:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands

Benelux:Benelux:

Tel: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [email protected]

Czech Republic:Czech Republic:

Czech Republic: ul. Rude armady 1868, 733 01 Karvina-Hranice

Czech Republic:Czech Republic:

Tel: [phone] FAX: [phone]
Toll Free: 0800-1-66342
e-mail: [email protected]

France:France:

France: 9, rue Denis Papin, 78190 Trappes

France:France:

Tel: [phone] FAX: [phone]
Toll Free in France: 0800-4-06342
e-mail: [email protected]

Germany/Austria:Germany/Austria:

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

Germany/Austria:Germany/Austria:

Tel: [phone] FAX: [phone]
Toll Free in Germany: 0130 11 21 66
e-mail: [email protected]

United Kingdom:United Kingdom:

United Kingdom: One Omega Drive, River Bend T echnology Centr e

United Kingdom:United Kingdom:

ISO 9002 Certified Northbank, Irlam, Manchester

M44 5EX, England
Tel: [phone] FAX: [phone]
Toll Free in the United Kingdom: 0800-488-488
e-mail: [email protected]

It is the policy of OMEGA 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 Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.

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ARNINGARNING

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ARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

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ARNINGARNING

2

Models DMD-482-S2, DMD-483-S2, DMD-485-S2

Description

The Models DMD-482-S2, DMD-483-S2, DMD­485-S2 is a self contained, AC powered strain
gage to RS232 computer interface module.
Each model contains a precision differential
instrumentation amplifier, A/D converter,
microprocessor and a highly regulated bridge
excitation source. The unit is completely
encapsulated for use in rugged environments.

Specifications

AC Powered Bridgesensors - RS232 Interface

Features

n RS232 Output
n 15 Bit Resolution
n 10V Bridge Excitation Supply Capable of

Driving 4 Load Cells

n Rugged Epoxy Encapsulated Design with

Screw Terminals and DB9 Connector for Easy
Hookup to PC

n Basic Software Program Supplied with Unit for

Calibration and Data Logging

n Up to 64 addresses
n AC Powered

Applications

n Weighing with Load Cells
n Low Frequency Strain Measurements
n Can Be Used with All Types of

Low Output Sensors

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Models DMD-482-S2, DMD-483-S2, DMD-485-S2

Block Diagram

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WS123456

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Mechanical Specifications

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Models DMD-482-S2, DMD-483-S2, DMD-485-S2

RS232 Protocol

Standard DB9 connector

Pin 2 - RX - Data Transmitted by DMD-480 Series Model
Pin 3 - TX - Data Received by DMD-480 Series Model

Pin 5 - GND
Baud Rate - 4800
Parity - None
Data Bits - 8
Stop Bits - 1
ASCII code

Message Structure:

To request a measurement - 5 characters

1st - “T” = Alpha command character
2nd thru 4th - unit address - 3 ASCII decimal

digits 000 to 063
5th - CR terminator = 0DH
Returned data - Sign if negative, 5 digits, CR and LF.

Test Modes:

Test Mode 1 - Same as returned data above

Test Mode 3 - Unit sends a 37 character string.

The last two characters are a CR LF.

- “Mode 3: Version 941101
address: 01” CR LF

5

Models DMD-482-S2, DMD-483-S2, DMD-485-S2

A/D Conversion

The A/D converter is ratiometric with respect to the bridge excitation supply. The 15 bit A/D provides

0.0024% resolution and is linear to 0.01% up to 10% over range input.

Transducer Excitation

The bridge excitation is provided by an AC powered, regulated, low noise power supply. The excitation
voltage is factory set to 10.00V and is adjustable ±3% by means of a molded in potentiometer. Precisely
setting the excitation to 10.00V at the bridge is not necessary due to the ratiometric A/D. If the unit is used
without the built in excitation supply driving the bridge the low side of the external power supply must be
connected to pin 3.

Software

The 4500.BAS basic program is provided with each unit and allows the user to custom program each
application. Each unit may be set up in a “Test Mode” to perform internal diagnostic tests to assist in setting
up a complete system. After the system is up and running correctly, the unit may be programmed to deliver
continuous data streams or to send data only on command from the host computer. Up to 64 addresses
are possible with the DMD-482-S2, DMD-483-S2 or DMD-485-S2

Setup Procedure

Each unit is shipped with a step by step users manual that covers the setup procedure and walks the user
through the 4500.BAS program. In the event that there are any questions, OMEGA applications engineers
are available to assist you on our toll free number.

6

Description

Models DMD-482-S4, DMD-483-S4, DMD-485-S4

Features

The Models DMD-482-S4, DMD-483-S4, and DMD­485-S4 are self contained, AC powered strain
gage to RS485 computer interface modules. Each
model contains a precision differential
instrumentation amplifier, A/D converter,
microprocessor and a highly regulated bridge
excitation source. Each unit is completely
encapsulated for use in rugged environments.

Specifications

AC Powered Bridgesensors - RS485 Interface

n RS485 Output
n 15 Bit Resolution
n 10V Bridge Excitation Supply Capable of

Driving 4 Load Cells

n Rugged Epoxy Encapsulated Design with

Screw Terminals for Easy Hookup

n Basic Software Program Supplied with Unit for

Calibration and Data Logging

n Up to 64 addresses
n AC Powered

Applications

n Weighing with Load Cells
n Low Frequency Strain Measurements
n Can Be Used with All Types of

Low Output Sensors

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lacipyT-tfirDoreZ±/Vµ57.0°C

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SMRstloV005

AV6

7

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wercS

lanimreT

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Models DMD-482-S4, DMD-483-S4, DMD-485-S4

Block Diagram

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WS123456

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Mechanical Specifications

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Models DMD-482-S4, DMD-483-S4, DMD-485-S4

RS485 Protocol

Terminal Block

Terminal 1 = Common
Terminal 2 = +RX

Data Received by DMD-480 Series Model

Terminal 3 = -RX
Terminal 4 = +TX

Data Transmitted by DMD-480 Series Model

Terminal 5 = -TX
Terminal 6 = +RX
Terminal 7 = -RX
Terminal 8 = +TX

Terminal 9 = -TX
Baud Rate = 4800
Parity = None
Data Bits = 8
Stop Bits = 1
ASCII code

Message Structure:

To request a measurement - 5 characters

1st - “T” = Alpha command character
2nd thru 4th - unit address - 3 ASCII decimal

digits 000 to 063
5th - CR terminator = 0DH

Returned data - Sign, 5 digits, CR and LF

Test Modes:

Test Mode 1 - Same as returned data above

Test Mode 3 - Unit sends a 37 character string.

The last two characters are a CR LF.

- “Mode 3: Version 941101
address: 01” CR LF

9

Models DMD-482-S4, DMD-483-S4, DMD-485-S4

A/D Conversion

The A/D converter is ratiometric with respect to the bridge excitation supply. The 15 bit A/D provides

0.0024% resolution and is linear to 0.01% up to 10% over range input.

Transducer Excitation

The bridge excitation is provided by an AC powered, regulated, low noise power supply. The excitation
voltage is factory set to 10.00V and is adjustable ±3% by means of a molded in potentiometer. Precisely
setting the excitation to 10.00V at the bridge is not necessary due to the ratiometric A/D. If the unit is used
without the built in excitation supply driving the bridge the low side of the external power supply must be
connected to pin 3.

Software

The 4500.BAS basic program is provided with each unit and allows the user to custom program each
application. Each unit may be set up in a “Test Mode” to perform internal diagnostic tests to assist in setting
up a complete system. After the system is up and running correctly, the unit may be programmed to deliver
continuous data streams or to send data only on command from the host computer. Up to 64 addresses
are possible with the DMD-482-S4, DMD-483-S4, DMD-485-S4.

Setup Procedure

Each unit is shipped with a step by step users manual that covers the setup procedure and walks the user
through the 4500.BAS program. In the event that there are any questions, CALEX applications engineers
are available to assist you on our toll free number.

10

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 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 vibration; improper specification;

misapplication; misuse or other operating conditions outside of OMEGAs control. Components which wear

are not warranted, including but 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 it will be as specified and free of defects. OMEGA MAKES NO OTHER

WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS 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 purchaser 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.

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 1999 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.

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 product, and

3. Repair instructions and/or specific problems

relative to the product.

11

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA...Of Course!

TEMPERATURE

þ Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies
þ Wire: Thermocouple, RTD & Thermistor
þ Calibrators & Ice Point References
þ Recorders, Controllers & Process Monitors

þ Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

þ Transducer & Strain Gauges
þ Load Cells & Pressure Gauges
þ Displacement Transducers

þ Instrumentation & Accessories

FLOW/LEVEL

þ Rotameters, Gas Mass Flowmeters & Flow Computers
þ Air Velocity Indicators
þ Turbine/Paddlewheel Systems

þ Totalizers & Batch Controllers

pH/CONDUCTIVITY

þ pH Electrodes, Testers & Accessories
þ Benchtop/Laboratory Meters
þ Controllers, Calibrators, Simulators & Pumps

þ Industrial pH & Conductivity Equipment

DATA ACQUISITION

þ Data Acquisition & Engineering Software
þ Communications-Based Acquisition Systems
þ Plug-in Cards for Apple, IBM & Compatibles
þ Datalogging Systems

þ Recorders, Printers & Plotters

HEATERS

þ Heating Cable
þ Cartridge & Strip Heaters
þ Immersion & Band Heaters
þ Flexible Heaters

þ Laboratory Heaters

ENVIRONMENTAL

MONITORING AND CONTROL

þ Metering & Control Instrumentation
þ Refractometers
þ Pumps & Tubing
þ Air, Soil & Water Monitors
þ Industrial Water & Wastewater Treatment
þ pH, Conductivity & Dissolved Oxygen Instruments

M-3242

12