DI-1000 - Loadstar Sensors
48521 Warm Springs Blvd
Suite 308
Fremont, CA 94539
(510) 274-1872
www.loadstarsensors.com
DI-1000
High Precision Resistive Load Cell to USB
Adapter
Users Guide
Copyright © 2008, 2014 Loadstar Sensors, Inc.. All rights reserved.
DI-1000
Di1000 User Guide
Notes
© Copyright 2008/2014 Loadstarsensors Inc. All Rights Reserved.
No part of this manual may be reproduced in any form or by any means (including electronic storage
and retrieval, or translation into a foreign language) without prior agreement and written consent from
Loadstarsensors, Inc. as governed by United States and international copyright laws.
Manual Part Number
033-01591
First Edition: November 2008
Fifth Edition: February 2014
Loadstar Sensors Inc.,
48521 Warm Springs Blvd., Suite 308
Fremont, CA 94539
(510) 274-1872 [Voice]
(510) 952-3700 [Fax]
WARRANTY
The material contained in this document is provided “as is,” and is subject to being changed without
notice. Further, to the maximum extent permitted by applicable law, Loadstar Sensors disclaims all
warranties, either express or implied, with regard to this manual and any information contained herein,
including by not limited to the implied warranties of merchantability and fitness for a particular
purpose. Loadstar Sensors shall not be liable for errors or for incidental or consequential damages in
connection with the furnishing, use, or performance of this document or of any information contained
herein. Should Loadstar Sensors and the user have a separate written agreement with warranty
terms covering the material in this document that conflict with these terms, the warranty terms in the
separate agreement shall override.
SAFETY INFORMATION
General
Do not use this product in any manner not specified by the manufacturer. The protective features of
this product may be impaired if it is used in a manner not specified in the operating instructions.
Do not install substitute parts or perform any unauthorized modification to the product. Return the
product to a Loadstar Sensors office for any required service and repair to ensure that safety features
are maintained.
Instrument Grounding
If your product is provided with a grounding type power plug, the instrument chassis and cover must
be connected to an electrical ground to minimize shock hazard. The ground pin must be firmly
connected to an electrical ground (safety ground) terminal at the power outlet. Any interruption of the
protective (grounding) conductor or disconnection of the protective earth terminal will cause a
potential shock hazard that could result in personal injury.
Cleaning
Clean the outside of the instrument with a soft lint-free, slightly dampened cloth. Do not use detergent
or chemical solvents. Doing so may void your warranty.
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WARNING
1. Do not use the DI-1000 with the cover, or part of the cover removed or loose, as a
hazardous condition may result. Inspect the case for cracks or missing plastic. Do not
use if the display is damaged.
2. Use only AC Adapter Charger(s), which conforms to the display required voltage and
current ratings provided.
3. Do not operate the display in an explosive atmosphere, or in the presence of flammable
gases or fumes.
4. Do not immerse the display in liquid, the housing is not fluid-tight. Humidity
specifications are specified as non-condensing only.
5. Do not substitute parts or modify the display box to avoid the introduction of additional
hazards. Return the display to Loadstar sensors office for service and repair to insure
all safety features are maintained.
6. When the built in Li Ion Polymer battery option is present, take care not to:
a. Operate or store the display in temperatures beyond -20C to 60C. Battery failure
may occur.
b. Excessive barometric pressure changes may also cause the battery to fail or
outgas. This display is not to be used within a pressure vessel, for example.
c. Excessive physical damage, or severe product impact, may cause battery
failure. Physically damaged units should be returned to the factory for service
and repair.
ROHS/WEEE COMPLIANCE STATEMENT
EUROPE
Directive 2002/95/EC. Restriction of the Use of Certain Hazardous Substances in Electrical &
Electronic Equipment, as amended by EU Commission Decision 2005/95/EC.
This product is RoHS Compliant 2005/95/EC.
“RoHS Compliant 2005/95/EC” means that the product or part (“Product”) does not contain any of the
substances in excess of the maximum concentration values in EU Directive 2002/95/EC, as amended
by Commission Decision 2005/618/EC, unless the substance is in an application that is exempt under
EU RoHS. Unless otherwise stated by Loadstar sensors in writing, this information represents
LoadStar Sensors best knowledge and belief based upon information provided by third party suppliers
to LoadStar Sensors.
In the event any product is proven not to conform with LoadStar Sensors Regulatory Information
Appendix, then LoadStar Sensors entire liability and Buyer’s exclusive remedy will be in accordance
with the Warranty stated below.
WEEE Directive (2002/96/EC)
The Waste Electrical and Electronic Equipment Directive (WEEE) applies to companies that
manufacture, sell, and distribute electrical and electronic equipment in the E.U. It covers a wide range
of large and small household appliances, IT equipment, radio and audio equipment, electrical tools,
telecommunications equipment, electrical toys, etc.
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The Directive aims to reduce the waste arising from electrical and electronic equipment, and improve
the environmental performance of everything involved in the life cycle of electrical and electronic
equipment. This is translated into the following requirements:
* Producers (manufacturers or importers) of electrical and electronic equipment will be required to
register in their countries.
* Private households will be able to return their WEEE to collection facilities free of charge and
producers will be responsible for financing these facilities.
* Producers will be required to achieve a series of demanding recycling and recovery targets.
* Wheeled bin emblem Producers will be required to mark their products with the ‘crossed out
wheeled bin’. This symbol indicates that the equipment carrying this mark must NOT be thrown into
general waste but should be collected separately and properly processed under local regulations.
The WEEE directive has been transposed into each EU member state’s legislation and so the exact
timing and details will vary slightly from country to country, but the above principles will apply. In
particular, the arrangements for the separate collection of WEEE will vary in each country but might
include for example: public collection points, retailers take back schemes, collection from households,
etc. The Directive encourages reuse, recycling and other forms of recovery in order to prevent WEEE.
Users of electrical and electronic equipment in the E.U. can therefore play an important role in
reducing WEEE and helping the environment by separating out WEEE and disposing of it properly.
Consumers can ask the supplier from whom they purchased the Electronic & Electrical equipment
from about local arrangements for the disposal of WEEE.
Business users are advised to ensure that WEEE, which is not suitable for reuse or recycling, be
disposed of properly via approved authorized treatment facilities. The Producer in your country may
be able to assist you.
Loadstar sensors is dedicated to minimizing the impact our products have on the environment and to
comply with the WEEE Directive.
ROHS in China
Electronic Industry Standard of the People’s Republic of China, SJ/T11363-2006. Requirements for
Concentration Limits for Certain Hazardous Substances in Electronic Information Products.
This symbol, per Marking for the Control of Pollution Caused by Electronic Information Products
SJ/T11364-2006, means that the product or part does not contain any of the following substances in
excess of the following maximum concentration values in any homogenous material: (a) 0.1% (by
weight) for cadmium. Unless otherwise stated by LoadStar Sensors in writing, this information
represents LoadStar Sensors best knowledge and belief based upon information provided by third
party suppliers to LoadStar Sensors.
In the event any product is proven not to conform with LoadStar Sensors Regulatory Information, as
provided herein, then LoadStar Sensors entire liability and Buyer’s exclusive remedy will be in
accordance with the Warranty stated below.
China RoHS is a two-step process that identifies concentration limits of certain hazardous substances
in electronic information products that are sold into China. Per the deadline set by the Chinese
government, March 1, 2007, LoadStar Sensors has implemented step one of China RoHS, self
declaration of hazardous materials and marking of the product. LoadStar Sensors display modules
that are sold into the China market have the required marking on the product designating that the
product meets the China RoHS requirements.
The second step involving a testing obligation is currently under development. Full compliance will
follow once it has been finalized.
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Table of contents:
1 2 3 4 5 INTRODUCTION ............................................................................................................................................ 7 1.1 External DI-1000 Connections ........................................................................................................... 8 1.2 DI-1000 Mechanical Dimensions ....................................................................................................... 9 STEP BY STEP OPERATING GUIDE .................................................................................................... 10 2.1 Plug in the AC power adapter to your DI-1000 ............................................................................ 10 2.2 Attach your load cell to the DI-1000 ............................................................................................... 10 2.3 Special sensor grounding considerations ..................................................................................... 12 2.4 Install Virtual COM port drivers ........................................................................................................ 13 2.5 Connect the USB Host (e.g., your PC) to the DI-1000............................................................... 13 Terminal command line operation ............................................................................................................ 13 2.6 13 2.7 Initial set up of the DI-1000 ............................................................................................................... 13 CALIBRATING THE DI-1000 .................................................................................................................... 15 3.1 Setting the calibration mode ............................................................................................................. 15 3.2 Millivolt Calibration .............................................................................................................................. 15 3.3 2-Point Calibration ............................................................................................................................... 15 ADDITIONAL CONSIDERATIONS .......................................................................................................... 17 4.1 Effect of Improper Grounding on typical resolution ..................................................................... 17 4.2 Noise (nV) vs Amplifier Gain ............................................................................................................ 17 4.3 Effect of Sample Rate on typical resolution (bits) ....................................................................... 17 DI-1000 COMMAND SUMMARY ............................................................................................................. 18 5.1.1 UNITÃ ........................................................................................................................................ 18 5.1.2 LCÃ .............................................................................................................................................. 18 5.1.3 ID Ã ............................................................................................................................................... 18 5.1.4 TARE ............................................................................................................................................. 19 5.1.5 GAIN Ã ........................................................................................................................................ 19 5.1.6 SPS Ã .......................................................................................................................................... 19 5.1.7 CAL Ã .......................................................................................................................................... 19 5.1.8 mVOLT Ã .................................................................................................................................... 20 5.1.9 2PCALÃ ....................................................................................................................................... 20 5.1.10 WÃ............................................................................................................................................ 20 5.1.11 WCÃ......................................................................................................................................... 20 5.1.12 WUÃ......................................................................................................................................... 21 5.1.13 RÃ ............................................................................................................................................ 21 5.1.14 SETTINGSÃ........................................................................................................................... 21 5.1.15 ?Ã ............................................................................................................................................. 21 ZIGBEE WIRELESS VERSION ................................................................................................................ 22 6.1 Before We Get Started ....................................................................................................................... 22 6.2 Installing Host USB Drivers .............................................................................................................. 22 6.3 Selecting the Virtual COM port and communicating ................................................................... 22 6.4 Continuation of the Quick Start ........................................................................................................ 24 7 DI-1000 TECHNICAL SPECIFICATIONS .............................................................................................. 25 6 Page: 5 / 25
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List of figures:
Figure 1: Load cell Wiring Block Connections ................................................................................... 8 Figure 2: Power and Host connections .............................................................................................. 8 Figure 4: Mechanical Long Side View (switch side) ......................................................................... 9 Figure 5: Mechanical End View (Power adapter and host connector) ............................................... 9 Figure 6: Removable Wiring Connector End (Load cell connection) ............................................... 10 Figure 8: Six Wire Load cell Wiring Schematic ................................................................................ 11 Figure 9: Typical RMS noise Values (nV) vs. sample rate .............................................................. 17 Figure 10: Typical noise free equivalent resolution (bits) ................................................................ 17 Page: 6 / 25
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1 INTRODUCTION
The Basic Loadstar Sensors DI-1000U High Precision Load Cell Interface module provides a
convenient method to convert nearly any existing millivolt output load cell into a PC friendly USB
load cell! Just attach your 4 or 6 wire strain gauge load cell to the convenient 8-pin wiring
connector, plug the USB host connector to your PC, and voila! you’ve got a complete Windows PC
ready load cell measurement system. The unit can be powered entirely by the PC’s USB port. The
included AC power adapter is needed only for wireless capable DI-1000ZP units with battery
backup.
The DI-1000ZP offers the following additional features:
1) Internal ZigBee wireless networking. With the advanced power saving features can run for
long periods of time without any cable connections.
2) Extended input voltage 6 – 32V input, compatible with industrial process control
3) Included Li-Polymer battery, for true cable free operation, for up to 5 hours.
4) This unit can also be used in wired USB mode for faster throughput.
Either DI-1000 device version offers the same high precision load cell to PC interface. With
consistent remote programming, built in LoadVUE software compatibility, and low power operation,
either DI-1000 device is sure to play a key role in your high performance measurement system.
Basic Module Features:
•
May be powered from USB Host (if connected). No need for AC adapter for most load
cells.
•
Standards Compliant 5.00V load cell excitation
•
Supports 200(optional)/300/330/350 Ohm (or higher) Load cells
•
Supports 4-wire and 6-wire load cell connections for improved accuracy
•
All user input program parameters stored in non-volatile memory.
•
Convenient small industrial case, for convenient mounting options in your equipment
•
Power On/Off switch, allows manual control.
Extended Module Features:
(including the features above, the extended DI-1000ZP also includes: )
•
Extended input voltage range (6V – 32V), compatible with nearly all process controllers.
•
Internal Lithium-Ion Polymer cell, for true cable free operation. Internal battery is
automatically recharged when sufficient external power is available (either AC adapter, or
USB). Battery charging will always occur regardless of the power switch setting.
•
ZigBee wireless networking. No wires!
Advanced power saving features, allow extended run time during cord free operating conditions.
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The following pictures of the DI-1000 show the external connections.
1.1
External DI-1000 Connections
Figure 1: Load cell Wiring Block Connections
Figure 2: Power and Host connections
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1.2
Di1000 User Guide
DI-1000 Mechanical Dimensions
Figure 3: DI-1000 Mechanical Top View
Figure 4: Mechanical Long Side View (switch side)
Figure 5: Mechanical End View (Power adapter and host connector)
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Figure 6: Removable Wiring Connector End (Load cell connection)
2 STEP BY STEP OPERATING GUIDE
Designed for ease of use, the DI-1000 is easy to bring up. The following steps should get you up
and running quickly.
2.1
Plug in the AC power adapter to your DI-1000
2.2
Attach your load cell to the DI-1000
Both 4-wire and 6-wire load cell wiring diagrams for the DI-1000 are shown in the following figures:
Figure 7: Four Wire Load Cell Wiring Schematic
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Note that, as shown in the following picture, for a 4-wire load cell, you will need to add an
external jumper between pins 1 and 2 (+EXsens and +EX) as well as between pins 5 and 6 (EXsens and –EX).
Figure 8: Six Wire Load cell Wiring Schematic
We’ve included a handy reference chart below that you can use to help determine how to correctly
wire your load cell to the DI-1000 wiring connector.
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Table 1: Typical Load Cell Wiring Color Table
+Excitation
(+EX)
-Excitation
(-EX)
+Signal
(+SEN)
-Signal
(-SEN)
Shield
(Earth)
+Sense
(+EXSENS)
-Sense
(-EXSENS)
A&D
Engineering
Red
White
Green
Blue
Yellow
(Tie to +EX)
(Tie to –EX)
Allegany
Green
Black
White
Red
Bare
(Tie to +EX)
(Tie to –EX)
Beowulf
Green
Black
White
Red
Bare
(Tie to +EX)
(Tie to –EX)
BLH
Green
Black
White
Red
Yellow
(Tie to +EX)
(Tie to –EX)
Cardinal
Green
Black
Red
White
Bare/Yellow
(Tie to +EX)
(Tie to –EX)
Digi Matex
Red
White
Green
Yellow
Silver
(Tie to +EX)
(Tie to –EX)
Electroscale
Red
Black
Green
White
Bare
(Tie to +EX)
(Tie to –EX)
Evergreen
Green
Black
White
Red
Bare
(Tie to +EX)
(Tie to –EX)
General Sensor
Red
Black
Green
White
Bare
(Tie to +EX)
(Tie to –EX)
HBM
Green
Black
White
Red
Yellow
(Tie to +EX)
(Tie to –EX)
HBM (PLC/SBE)
Red
Black
Green
White
Yellow
(Tie to +EX)
(Tie to –EX)
Interface
Red
Black
Green
White
Bare
(Tie to +EX)
(Tie to –EX)
Kubota
Red
White
Green
Blue
Yellow
(Tie to +EX)
(Tie to –EX)
LeBow
Red
Black
Green
White
Bare
(Tie to +EX)
(Tie to –EX)
Mettler Toledo
White
Blue
Green
Black
Orange
Yellow
Red
National Scale
Green
Black
White
Red
Yellow
(Tie to +EX)
(Tie to –EX)
NCI
Red
Black
White
Green
Bare
Yellow
Blue
Nikkei
Red
Black
Green
White
Bare
(Tie to +EX)
(Tie to –EX)
Presage
Promotion
Blue
White
Red
Black
Yellow
(Tie to +EX)
(Tie to –EX)
Philips
Red
Blue
Green
Gray
Bare
(Tie to +EX)
(Tie to –EX)
Revere
Green
Black
White
Red
Orange
(Tie to +EX)
(Tie to –EX)
Sensortronics
Red
Black
Green
White
Bare
(Tie to +EX)
(Tie to –EX)
Sensortronics
60007
Green
Black
White
Red
Yellow
(Tie to +EX)
(Tie to –EX)
Strainsert
Red
Black
Green
white
Bare
(Tie to +EX)
(Tie to –EX)
T-Hydronics
Red
Black
Green
White
Bare
(Tie to +EX)
(Tie to –EX)
Tedea/Huntleigh
Green
Black
Red
White
Bare
Blue
Brown
Thames Side
Red
Blue
Green
Yellow
Bare
(Tie to +EX)
(Tie to –EX)
Toledo
Green
Black
White
Red
Yellow
(Tie to +EX)
(Tie to –EX)
Totalcomp
Red
Black
Green
White
Bare
(Tie to +EX)
(Tie to –EX)
Transducers
Red
Black
Green
White
Orange
(Tie to +EX)
(Tie to –EX)
2.3
Special sensor grounding considerations
The DI-1000 has two ground pins, EARTH ground, and SIGNAL ground. Connection to both pins
should be carefully considered for each application. The very high accuracy possible using the DI1000 can easily be compromised with an incorrect connection to EITHER of these two pins!
Firstly, make sure you know how your load cell is wired! If your load cell has 4 wires and one
shield, that shield may be attached to the body of the load cell. Verify this with an ohm-meter or
continuity test! If your load cell has 6 wires, and two shield wires, one is the sensor body, the other
is the signal shield.
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The DI-1000 connects signal ground to the adapter power ground, and also connects to the USB
signal power ground. Ideally this ground should be connected to any cable shield, but not the load
cell body. Many load cell assemblies connect the cable shield to the load cell body. This creates a
problem, since any ground connection between the load cell and your system ground will induce a
current in this combined ground system. In this case, you’ll need to connect the load cell shield to
the DI-1000 earth ground terminal, so a ground loop is not formed with the load cell within your
system. Make sure your earth ground is electrically clean, to avoid introducing excessive common
mode noise into your load cell signal wiring.
The DI-1000 earth ground is isolated from signal ground, which is connected to the USB host
shield ground. Keep in mind that EMI performance and ESD protection depend on the earth
ground connection, so this shield terminal should ALWAYS be connected to a suitable earth
ground in your system. That connection in some cases may be adequately made by the USB
cable itself to your PC. It is your responsibility to verify this is the case.
The simplest approach is to simply connect all system grounds to the DI-1000 earth ground
terminals. If performance isn’t adequate in this case, then experimenting with system grounding,
can often improve system performance.
2.4
Install Virtual COM port drivers
The DI-1000 may be accessed on your host PC using either using a simple virtual COM port
mechanism, or by using the LoadVUE application. For information on LoadVUE, please refer to
the manual which ships with that software CD for more details.
This document will focus on the virtual serial interface. This approach may be easily adapted to
user programs, and is very flexible.
Please install the drivers for the DI-1000 using the included iLoad Digital USB Driver disc or, if you
have purchased LoadVUE software, from the LoadVUE disc. Instructions are included with the
documentation that comes with your driver disc or LoadVUE.
Once you have connected the DI-1000U physically to your PC, you can use the steps outlined in
the document entitled “Driver Installation and Hyperterminal Operation of iLoad Digital USB
Sensors and Interface Devices” to determine the COM port assigned and to connect to
HyperTerminal.
Please note that the instructions in the booklet above are written primarily for Loadstar Sensors’
iLoad series of Digital USB sensors, but will work with the DI-1000 as well with the one change that
the Baud rate for communication should be set at 9600 (or 230400 for DI-1000U-HS high speed
models)..
2.5
Connect the USB Host (e.g., your PC) to the DI-1000
2.6
Terminal command line operation
Once you are connected to the DI-1000 via HyperTerminal or another terminal emulator, press
<ENTER> several times. You should get an “A” returned onscreen for every <ENTER> pressed.
You may now type ASCII commands to the DI-1000, to remotely monitor and control the attached
sensors.
You may press “?” at any time to see the available command list. The available commands will be
described in detail in the next chapter.
2.7
Initial set up of the DI-1000
1. Enter desired units: UNIT LB← (← stands for the Enter key)
2. Enter total load capacity of the attached load cell (e.g., 100 lb): LC 100.0 ←
3. Enter your desired load cell name: ID SENSOR_1
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4. Enter the desired amplifier gain: GAIN 64 ←
5. Enter the desired samples/sec: SPS 60←
6. Reset the zero value of the sensor: TARE ←
7. Set the calibration mode to be used for load measurements. You can set mV/V
calibration by entering CAL m←. Two point calibration mode is selected by typing
CAL 2←.
Assuming you have already entered a calibration (see the next section) for the selected mode, you
may now monitor the load on the load cell: type WC ← at the terminal window.
Continuous weight output updates end when a carriage return (←) is pressed.
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3 CALIBRATING THE DI-1000
Two calibration modes are currently supported by the DI-1000 firmware:
1. Millivolt calibration
2. 2-point linear calibration
You may perform the calibration for either mode at any time and independently select the actual
calibration mode to be used. Please ensure that the load capacity of your load cell is entered
correctly using the LC command before any calibration is performed.
3.1
Setting the calibration mode
The CAL command is used to select the calibration mode:
CAL m← selects the mV/V mode.
CAL 2← selects the 2 point calibration mode
3.2
Millivolt Calibration
Millivolt calibration is in some respects the easiest user calibration to perform. For every resistive
load cell sensor shipped, either a calibration report, or a label on the sensor itself should have the
mV/V calibration number present. This number is the best fit mV/V value determined during the
factory calibration procedure.
To enter the mVolt calibration type the following in your terminal window:
mvolt x.xxxx←
(where x.xxxx represents the known mV/V calibration number for the load cell)
The DI-1000 echoed the value of the mV/V number you typed in to confirm that it has been
accepted.
The calibration value is retained until it is again changed by the user, even through DI-1000 power
cycles.
3.3
2-Point Calibration
Two point calibration can be used if you have the ability to load and unload your load cell with
known weights or forces. Two-point is the simplest form of curve fitting: a simple best fit linear
relationship between no-load, and a known load value. Accuracy will improve as the known load
moves closer to the full scale value for the attached load cell.
To begin this calibration procedure, remove any loading from the load cell.
command:
2pcal X←
Then type the
(where X represents the value of the load to be used for the second point in the units set)
The DI-1000 prompts back with
Apply Point 1 Load of
0, LB Press C when ready or Q to quit
Ensure that there is no load applied to the load cell and press the “C” key. After a couple of
seconds, the DI-1000 prompts with:
Apply Point 2 Load of
X, LB Press C when ready or Q to quit
Again, the “X” above represents the value of your calibration load to be applied in the units set on
the DI-1000. Apply the calibration load to the load cell and press the “C” key.
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The DI-1000 responds with a number and “Calibration complete!” Your two point calibration
has been stored. The number reported represents the mV/V of the load cell as computed by the
DI-1000.
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4 ADDITIONAL CONSIDERATIONS
4.1
Effect of Improper Grounding on typical resolution
4.2
Noise (nV) vs Amplifier Gain
Figure 9: Typical RMS noise Values (nV) vs. sample rate
4.3
Effect of Sample Rate on typical resolution (bits)
Figure 10: Typical noise free equivalent resolution (bits)
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5 DI-1000 COMMAND SUMMARY
The commands for the DI-1000 can all be entered without parameters to have the DI-1000 report
the value of the appropriate parameters in memory. For example, entering UNIT KG← sets the DI1000 units to KG. Now entering UNIT← gets the DI-1000 to respond with the currently set units, i.e.
KG.
5.1.1
UNITÃ
Function:
Set (returns) currently selected units
Summary:
Sets or returns one of the 3 unit types: LB (pounds), Kg (kilograms) or N
(Newtons) both for internal and output usage..
Example:
UNIT LB ← (to set units TO POUNDS)
UNIT ← (to display currently set units)
5.1.2
LCÃ
Function:
Sets (returns) the load capacity of the attached load-cell
Summary:
Sets or returns the total load capacity of the load-cell as a floating point number.
Should be entered in the currently selected value of UNIT.
Example:
UNIT KG ← (example sets units to KILOGRAMS
LC 500 ← (sets total load capacity to 500 Kg)
LC← displays currently set load capacity
5.1.3
ID Ã
Function:
Sets (Returns) a unique identification string for this device
Summary:
Sets or returns a unique identification string for this device. The total string
should not exceed 12 characters. The string value is retained between power
cycles.
Example:
ID Sensor_12
(Note that we typically enter the unit serial number as the ID at the factory)
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5.1.4
Di1000 User Guide
TARE
Function:
Tares, or sets the display ZERO value.
Summary:
When this command is issued, the current ADC value, is retained as the
currently defined ZERO output value. All output values are referenced to this
value.
Example:
TARE ←
5.1.5
GAIN Ã
Function:
Sets (returns) input amplifier gain
Summary:
Sets (returns) the input amplifier gain. This is used to compensate for different
load cell impedances, and re-scaling of device input gain. Valid gains are 1, 2,
4, 8, 16, 32 and 64. Factory default is 64.
Example:
GAIN 32 ←
5.1.6
SPS Ã
Function:
Sets (returns) ADC sample rate
Summary:
Sets (returns) the currently selected number of ADC samples/second.
Remember! Accuracy increases with fewer samples/second, so always choose
the slowest rate your application can tolerate. Valid samples rates/second are:
7.5, 15, 30, 60, 120, 240, 480, 960, 1920, 3840. Factory default is 120
5.1.7
CAL Ã
Function:
Sets (returns) calibration type
Summary:
Sets or returns the currently selected calibration type. Acceptable values are:
1. m for milliVolt calibration
2. 2 for 2 point calibration
Example:
CAL m ← (sets mV calibration mode)
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5.1.8
Di1000 User Guide
mVOLT Ã
Function:
Sets (returns) the current mV calibration parameter
Summary:
Sets (returns) the current sensor mV calibration parameter. This may be the
parameter listed on the sensor, the manufacturers data sheet, or may have been
derived through the calibration procedure.
Example:
MVOLT 2.123 ←
5.1.9
2PCALÃ
Function:
Runs the 2 point calibration procedure
Summary:
Begins the 2 point calibration procedure. Follow the prompts from the DI-1000
to complete the calibration as described in the section on calibration above.
Example
2PCAL 250←
5.1.10
WÃ
Function:
Displays the current weight
Summary:
Displays the current measured weight in the currently active units
Example
W ← -­‐277.162536 A 5.1.11
WCÃ
Function:
Continuously outputs current weight
Summary:
Produces a continuous stream of output. Each line of the output represents the
load in the currently set units. You may stop the streaming load readings by
pressing the Enter key.
Example
WC ←
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DI-1000
5.1.12
Di1000 User Guide
WUÃ
Function:
Displays current weight & units
Summary:
This is similar to the W command except that the unit is also reported by the DI1000.
Example
WU ← -0.363733 LB
5.1.13
Function:
RÃ
Return RAW ADC value
Summary:
Example
5.1.14
Function:
R←
SETTINGSÃ
Returns all current setting values
Summary:
Example
5.1.15
Function:
SETTINGS ←
?Ã
Returns the command summary
Summary:
Example
?←
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Di1000 User Guide
6 ZIGBEE WIRELESS VERSION
The DI-1000 also ships as a “wireless” version, with an internal battery for true cable free
operation.
A separate USB “dongle” is provided to plug into the PC, which wirelessly
communicates with the remote DI-1000 and attached loadcell device.
The wireless link between the DI-1000 and the PC uses a point to point variant of the ZigBee
802.15.4 protocol which provides wireless end-point connectivity for fast wireless networking
between the provided host dongle, and the DI-1000 device. Features include:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Power Output: 1mW (+0 dBm) North American & International version Indoor/Urban range up to 100 feet (30 meters) Outdoor line of sight up to 300 feet (90 meters) RF Data Rate 250 kbps Interface data rate: 9600/230400 baud Operating Frequency 2.4 Ghz Receiver Sensitivity up to -­‐92 dBm Direct Sequence Spread Spectrum for improved interference immunity Automatic link error handling, with transparent retries and data acknowledgement Up to 16 channels available (Channel is currently set at the factory only) The internal LiPolymer battery run-time typically falls between 10 and 20 hours depending on the
attached loadcell impedance, and the frequency of host data queries. For longer periods of time,
an external battery (for example a 12V Gel Battery) can easily be used to extend the operational
life to any desired length. .For those applications that can support a physical AC power adapter
connection, no additional restrictions on runtime, query rate, or loadcell impedance apply.
6.1
Before We Get Started
1. Verify the power switch is set to “ON.” Please note, the unit should not be left unpowered for long periods of time, as the internal battery can become discharged and it’s lifetime compromised. 2. Make sure the internal battery is fully charged before any extended “wireless” run is attempted. Plug the provided AC adapter into the DI-­‐1000, for 6 to 8 hours minimum, to insure the internal Li battery is fully charged. 6.2
Installing Host USB Drivers
Please refer to section 3.4 for installing the drivers. The drivers used by the DI-­‐1000 in direct wired connection and through the wireless dongle are the same. 6.3
Selecting the Virtual COM port and communicating
Hyperterminal is the most popular terminal program available on Windows PC’s, since a basic
version comes preloaded with Windows XP.
Unplug the Wireless DI-1000 dongle, and plug it back in. When you do so, the Windows Device
Manager will help to determine which port corresponds to the connected DI-1000 dongle.
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Di1000 User Guide
After connecting the DI-1000 a new port should appear:
In the above figure, COM22 corresponds to the virtual COM port of the DI-1000 Dongle.
Next, open Hyperterminal, and create a new connection corresponding to your attached DI-1000
device:
Select the COM port previously determined to correspond to the DI-1000:
Set the Baud Rate, parity, data bits, and number of stop Bits, as 9600-N-8-1. If you have a
DI-1000U-HS (high speed) modem, set the baud rate to 230400
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Di1000 User Guide
Click Apply, OK and <ENTER> several times. You should get an “A” returned onscreen
for every <ENTER> pressed. You many now type ASCII commands to the DI-1000, to remotely
monitor and control the attached sensors.
You may press “?” at any time to see the available command list. Please continue at section
6.4
Continuation of the Quick Start
The quick start process continues the same as in section 3.7 above with the wired version. Please
continue there.
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Di1000 User Guide
7 DI-1000 TECHNICAL SPECIFICATIONS
Performance
Resolution
See Figure 10: Typical noise free equivalent resolution (bits)
Output Resolution
Dynamic, Sensor Dependent
Update Speed
Programmable, 7.5 – 3840 Samples/Second
Output Sensitivity
Sensor dependent
Software Filter
None
Temp Coefficient
None
Environment
Operating Temperature
-10 to 55C (15 to 131F) (no battery)
-10 to 45C (15 to 113F) (with internal battery)
Storage Temperature
-20 to 85C (-5 to 185F) (no battery)
-20 to 60C (-5 to 140F) (with internal battery)
Warning: NEVER EXCEED 60C when internal battery is installed
Humidity
5 to 85% RH Non Condensing
Voltage
6 to 12 VDC [Basic Edition], 6 to 32 VDC [Battery Edition]
Power
1W
Vibration
Not to exceed 4 mm displacement at 16.7 Hz, for > 60 mins.
Shock
Not greater than a 20 cm drop onto a hard wooden surface
Enclosure
Construction Material
ABS Plastic
Dimensions
approx. 3.2” x 1.6”
Maximum Remote Load Cell Cable Length
Cable Length
100 feet, 20 Gauge wire (6 wire sensor)
Cable Length
20 feet, 20 Gauge wire (4-wire sensor)
Special Interfaces
Host Interface
USB (virtual COM)
Sensor Interface
USB host
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P/N : 033-01591 Rev. 6
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