MonoDAQ-U-X Quick Start Guide

1         Introduction

MonoDAQ-U-X is a multifunctional data acquisition device that is supported in DEWESoft software. MonoDAQ-U plugin for DEWESoft is needed for communicating with the device.

The device cannot operate together with DEWESoft data acquisition devices.

2         Installation

1. Download the software files from the following locations:

*You can run 32-bit software version on a 64-bit processor, but you cannot run a 64-bit version on a 32-bit processor.

2. Unpack and install DEWESoft by running the »DEWESoft_X3_Installer…exe« and following the instructions.

Preferrably the software should run on a Windows 10 platform. If Windows 7 or 8 is used, additional USB driver may need to be installed. It is located in the “MonoDAQ-U USB driver (Win7 only)” folder. You can install it by opening the Windows Device Manager and looking for a device with a yellow exclamation point. Right click on it and click on the “Browse my computer for driver software”. Enter the location of the driver files, click Next and follow further instructions.

Upon launching DEWESoft X3 software a warning might appear which tells you that you don’t have the license to run plugins.

Click “Ignore warnings (this will change your current project)” to move into the Settings/Licensing screen. Click on “Create new license”, enter your license key and click “OK” in the bottom right corner.

A plugin tab with MonoDAQ logo should appear in Channel Setup next to the Math module. Click on it to display the configuration screen of the MonoDAQ-U-X device.

 

When the device is connected over USB, the configuration table will appear.

3         Channel configuration

Front end of the MonoDAQ-U-X device can be configured in many different ways. Since the pins labelled 1 to 8 on the front panel can be either analog or digital, inputs or outputs, the configuration table helps the user to configure them.

Each pin is configured starting with the Function column. Depending on the chosen function (voltage input, voltage output, thermocouple input, strain gauge input etc.), the Type column provides available types of that function (single ended, differential etc.) and the Range column provides the available input / ouptut ranges.

The Pin column of the table tells the user what should be connected to each pin depending on the configuration.

The table will always display only the options that are available depending on the previous selections. For example, if Voltage Input – Differential is chosen on pin 1, the Function of pin 2 is greyed out since it cannot be assigned to anything else. The negative wire of the measured signal for that channel should instead be connected to the pin 2.

The available Range and Sample Rate (Rate column) settings for each channel also depend on the previously chosen settings of other channels, therefore not all ranges and sample rates are always available. Refer to the data sheet of the instrument to see the list of its capabilities.

There are the »Undo« and »Reset to Defaults« buttons available at the top of the table to help the user moving through the configuration steps.

When channel configuration is complete the measurement can be started by clicking the Measure tab on the top of the DEWESoft window.

4         Pre-configured channel configurations

It is possible to save the full configuration of a device to the 1wire EEPROM chip. The EEPROM chip, typically a DS2431, should be connected between pins D9 and D10 while the Function of D9 is set to “1wire”. With the chip in this position, clicking “Connector Store” will save the configuraiton of the device to the chip. When the front connector with this chip is inserted into the device, it will automatically configure itself into the saved configuration.

The name of the configuration to be saved can be entered into the Configuration text field on top of the table.

5         MonoDAQ-U-X demo kit

The demo kit includes three pre-configured connectors:

  • Load cell – an FX1901 compression load cell with load capacity of 100 lbf (444.8 N)
  • Thermo – a T type thermocouple
  • Servo – a servo motor powered and controlled from the U-X device while also measuring the current

After any of the pre-configured connectors is connected to the device, the channel configuration grid configures itself accordingly. There are also DEWESoft setup files (.dxs) prepared for those three cases that include the configuration of the displays.

Load cell

The picture below shows a compression load cell connected to the MonoDAQ-U-X in full bridge measurement mode.

After plugging in the connector, the channels set themselves up automatically. Figure below shows how the channel grid looks like to interface the full bridge load cell. There is also a scale factor in there to scale from mV/V to N (force), but it us based on approximate numbers from the load cell data sheet. It should be calibrated for the specific application if very accurate measurement of force is neccessary. If the scale factor is set to 1, the channel will show values in mV/V which are accurate according to the U-X front end specification.

On top of that the prepared DEWESoft setup file (.dxs) can be loaded that adds preconfigured displays in the Measure mode. The setup can be downloaded here. Unzip it and load it by clicking DEWESoft logo in the top left cornet of the screen and choose “Load Setup”. The display in Measure mode should look like in the figure below. Pressing on the middle of the circular part of the load cell should clearly indicate the load.

Mind that it is not mandatory to load a setup. You can directly go to the Measure mode and you will be able to see a basic recorder. You can make your own screen in a few clicks. Learn more about how to set DEWESoft displays here.

Thermocouple

The picture below shows a T-type thermocouple connected to the U-X device.

After plugging in the connector the first channel is automatically set to thermocouple T type input. A similar setup as for the load cell can be also loaded for a thermocouple, it can be downloaded here. Temperatures up from -260 to 400 degC can be measured with a T-type thermocouple. Simply submerge the end point of a thermocouple cable into boiling water and observe the measurement.

Servo motor

A low power servo motor can be powered and controlled by the MonoDAQ-U-X device. Picture below is showing such a servo connected to the U-X device.

Connecting the servo motor connector make the channel setup look the most complex of the cases presented here. It sets the excitation to 5 V which powers the servo with up to 200 mA continuous current. Pin 8 is set as PWM digital output and controlls the servo. Looking at the Rate column, the “50” entered there means 50 Hz PWM. Value under Set is the pulse width in miliseconds: this controlls the position of the servo with 0 ms setting it to 0 deg and 2 ms moving it to 180 deg (with some servos it is 0.5 to 2.5 ms). This can be tested in channel setup by changing the Set value.

The display setup can be downloaded here. It sets a control channel that controls the Set value to a turn knob that you can rotate and thus control the rotation. On the bottom of the screen there is a scope showing the current supply to the servo on a PWM signal measured with 50 kS/s. It clearly shows the duration of the pulse. The digital meter below the turn knob shows the current averaged out over 1 second.