Mantracourt DSCUSB Instructions de montage

DSCUSB Advanced User Manual

mantracourt.com

DSCUSB

Digital Sensor Card USB –Strain Gauge Input

Mantracourt Electronics Limited - DSCUSB Advanced Manual

Contents

Chapter 1 Introduction........................................................................................................................................................2

Overview...........................................................................................................................................................................2

Manual Scope...................................................................................................................................................................2

Chapter 2 DSC Toolkit Software ........................................................................................................................................3

Information Page......................................................................................................................................................................................... 3

Advanced Calibration Page..................................................................................................................................................................... 4

Basic Calibration....................................................................................................................................................................................... 5

Auto Calibration .................................................................................................................................................................................. 5

Table Calibration ................................................................................................................................................................................. 5

Compensated Calibration ....................................................................................................................................................................7

1 Temperature Compensation.......................................................................................................................................................7

2 Auto Calibration...............................................................................................................................................................................8

3 Table Calibration ............................................................................................................................................................................. 8

4 Linearisation ...................................................................................................................................................................................... 9

Limits ..........................................................................................................................................................................................................10

Units............................................................................................................................................................................................................11

Protection .................................................................................................................................................................................................13

Chapter 3 Hardware.......................................................................................................................................................... 14

Alternative Form Factors ........................................................................................................................................................................14

Changing Sensitivity.................................................................................................................................................................................14

Identifying the ‘Rg’ Resistor..........................................................................................................................................................14

Identifying the Link Track ..............................................................................................................................................................14

Reducing Sensitivity.........................................................................................................................................................................15

Increasing Sensitivity .......................................................................................................................................................................15

Chapter 4 Communications ............................................................................................................................................. 16

Interface Explained ...................................................................................................................................................................................16

Communication Options ........................................................................................................................................................................17

Virtual Serial Port Connection......................................................................................................................................................17

MantraASCII2.DLL standard Windows DLL driver................................................................................................................17

DSCUSBDrv.DLL standard Windows DLL driver ....................................................................................................................17

Communications Protocol .....................................................................................................................................................................17

Read a Parameter..............................................................................................................................................................................17

Response Message Formats.........................................................................................................................................................18

Software Command Reference............................................................................................................................................................18

Serial Port Settings ...........................................................................................................................................................................18

Commands in Access Order..................................................................................................................................................................19

Chapter 5 Production Environments.............................................................................................................................. 20

COM Port Allocation................................................................................................................................................................................20

Mantracourt Electronics Limited - DSCUSB Advanced Manual

Chapter 1 Introduction

This chapter provides a brief introduction to the DSCUSB product and what to expect from this manual.

Overview

The DSCUSB product family comprises of Digital Sensor Cards that connect sensors to your PC via USB.

The DSCUSB product is a compact, high-precision Strain Gauge Converter; converting a strain gauge sensor input to

a digital output and is connected to a PC via a USB port. They allow high precision measurements to be made and

communicated directly to a PC and is aimed at applications which require high-accuracy measurement repeatability.

With the appropriate drivers installed, the DSCUSB appears as a virtual serial port to the PC.

Simply by plugging the device into a PC, data can be extracted from most strain gauge bridge input sensors and

acquired by software which allows data manipulation removing the need for amplifiers, filters & multimeters.

Free-standing module fitted with 9-way ‘D’ type socket for load cell and optional temperature sensor connections.

Micro USB socket accepts a USB lead with type ’A’ connector at the PC end.

Manual Scope

This manual covers Advanced functionality which includes loadcell profiling calibration, information on writing your

own communication software and advice on OEM production techniques.

If you have purchased this module and intend to connect it to a loadcell and perform linearization or temperature

compensation then you will need to refer to this Manual.

For user level calibration and common settings please refer to the DSCUSB Standard Manual.

Mantracourt Electronics Limited - DSCUSB Advanced Manual

Chapter 2 DSC Toolkit Software

Please refer the DSCUSB Standard manual for information on installing the DSC Toolkit

software.

This chapter assumes that you have already installed the DSC Toolkit software.

Information Page

When you select a connected module (or if only one module is connected) the information page is displayed. This

manual will deal with the Advanced Calibration section of the DSC Toolkit software.

Mantracourt Electronics Limited - DSCUSB Advanced Manual

Advanced Calibration Page

Click on the icon to open the Advanced Calibration page. The icon will appear like this when the module has

not had the Advanced Calibration locked out. A message will appear asking if you are sure you want to enter this

advanced level of the software.

If the module has been protected the icon will appear greyed out and you will have to enter a passcode to

access the Advanced Calibration page.

If the module is unlocked or you enter the correct passcode the following page will be displayed.

Mantracourt Electronics Limited - DSCUSB Advanced Manual

This page allows you to calibrate the module using various methods, set limits, perform system zero and set units

description.

The page is separated by tabbed sections. Click in a tab to change sections.

Revert to factory default calibration –Click the ‘Reset’ button to remove any custom calibration you have applied.

If the DSC module supports it the date of the last change to calibration settings will be displayed.

There are two main calibration methods. You can choose Basic Calibration for a simple 2 point auto or table

calibration or choose Compensated Calibration if you are going to perform linearization or temperature

compensation.

Basic Calibration

Choose this instead of Compensated Calibration if you do not want to perform temperature compensation or

linearization.

Auto Calibration

The automatic calibration requires that you apply two known (ascending) weight in sequence. Just enter the required

engineering unit value for the two weights in the fields marked 1 and 2.

Next, apply the low weight and allow a settle time. Click the ‘Acquire’ button then apply the high weight. After

another settle time click the second ‘Acquire’ button and the calibration is complete.

Table Calibration

Mantracourt Electronics Limited - DSCUSB Advanced Manual

This option lets you calibrate direct from the loadcell manufacturers certificate without having to apply weights to

the input.

Choose 2 points from the loadcell certificate and enter the mV/V values and the weights on the certificate (or

convert the certificate weight to any other engineering unit of your choice) click the ‘Calibrate’ button and the

calibration is complete.

Mantracourt Electronics Limited - DSCUSB Advanced Manual

Compensated Calibration

Choose this instead of Basic Calibration if you do want to perform temperature compensation or linearization.

To perform compensated calibration you must perform the different calibration sections in the following order.

1Temperature Compensation is optional.

2Auto Calibration must be completed OR complete the Table Calibration

3Table Calibration must be completed if you did not use Auto Calibration.

4Linearisation is optional.

If you go back and redo any of these tabs then you must also redo any later numbered tabs.

It is advisable that you click the Revert to factory default calibration button before you start a complete calibration

sequence on an unknown module or one that has been calibrated before.

1 Temperature Compensation

Please note that this software only allows you to compensate for temperature offsets!

The module must have an optional DTemp sensor wired to it and if this is functioning you will see a temperature

displayed on the middle right of the tab.

If you do not want to use temperature compensation select Disabled from the drop down list presented when you

click the Number of compensation points field.

Selecting any number of points from 2 to 5 will enable the first Acquire button. You need to keep the same weight

(or no weight) on the loadcell whilst subjecting it and the DTemp sensor to up to 5 different temperatures covering

the temperature range you wish to operate over.

You need to wait enough time at each temperature for the loadcell chassis to stabilise at that temperature and that

will depend on the chassis mass and material. Try and get the DTemp sensor close to the strain gauge element.

Once enough time has elapsed for the temperature to stabilise you can click the Acquire button and that button will

become disabled and the next enabled.

Once you have completed all the required points you will see the following message.

Mantracourt Electronics Limited - DSCUSB Advanced Manual

You can now move on to either Auto Calibration or Table Calibration.

2 Auto Calibration

The automatic calibration requires that you apply two known (ascending) weights in sequence. Just enter the

required engineering unit value for the two weights in the fields marked 1 and 2.

Next, apply the lowest weight and allow a settle time. Click the ‘Acquire’ button then apply the higher weight. After

another settle time click the second ‘Acquire’ button and the calibration is complete.

3 Table Calibration

This option lets you calibrate direct from the loadcell manufacturers certificate without having to apply weights to

the input.

Choose 2 points from the loadcell certificate and enter the mV/V values and the corresponding weights on the

certificate (or convert the certificate weight to any other engineering unit of your choice) click the ‘Calibrate’ button

and the calibration is complete.

Mantracourt Electronics Limited - DSCUSB Advanced Manual

4 Linearisation

This stage is optional. If you do not want to use linearization then select Disabled from the drop down list that is

presented when you click the Number of linearization points field.

To use linearization select the number of points you wish to use from 2 to 7. Once selected this will enable the

appropriate number of text fields for you to enter the known weights you are going to apply. You should enter these

in the same engineering units that were used in either the Auto Calibration or the Table Calibration.

The linearization points are usually spread out evenly between the two points used for auto calibration but if you

know that a particular section of the range is less linear you may want to concentrate the points in that area.

Once you have entered the engineering units weights for each point you can apply the weight, wait a settle time

then click the appropriate Acquire button.

Once you have completed all points the following message will be displayed.

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