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Troubleshooting connectivity issues with Loadstar Sensors' sensors or interfaces

On rare occasions, we get tech support calls from users whose computers have trouble detecting a sensor or interface. The steps below outline what you can do to troubleshoot the issue. If you are using the device on a Windows XP or Vista or Win7 Operating System, you will need to upgrade to a Win8/10 PC or Tablet and get our latest software version. Please contact us here.

Check Device Manager

First make sure the load cell or interface shows up in the device manager. All our devices use an FTDI device driver to convert serial port signals to a USB virtual COM port. This virtual COM port will appear in the device manager as an "USB Serial Port" device under the "Ports" section. To launch the device manager,

  • In Windows 8 or 10, just search for "Device Manager", or go to "Settings...PC Info...Device Manager'

Device Manager

Driver Installation

If the USB serial port entry does not show up then the drivers may not be properly installed. Reinstall the drivers from our Drivers page. The following devices need a S2U USB dongle to connect to the computer. Please make sure you are using such a dongle. You cannot use an off the shelf USB cable to connect the following devices to the computer.

Old Style Dongle  

S2U Dongle

Old Style   New Style


Also check the cable connections to make sure they are tight. If necessary try replacing the cable. If you have a lost or misplaced the dongle and/or cables, or if you have faulty cables or dongles, you can order new ones from Loadstar Sensors.

Other things to check:

  • DI-100 -> Is the LED blinking? If not the dongle and/or cable issues. The DI-100 unit itself may be faulty.
  • DI-1000 -> Check the power switch is turned on. (Some older units do not have power switches)
  • iLoad series-> Try pushing the cable HARD into the load cell to ensure a good connection.

Dongle/Cable Failures

If the device manager does show a serial port entry and you still have connectivity issues, it is very likely that the dongle or the cable is damaged. If the unit is still under the 90 day warranty, we will replace the defective parts for free but you have to pay for shippign fees to your location. If you are out of warranty, you can just order the needed replacements online.

Terminal Program

If you can connect, but the sensor reads 0 or invalid values, then you have to check the interface settings to see if the calibration data has been corrupted. To check the settings, you need a terminal program that can read and write to serial ports. If you are using Windows XP, the built-in Hyperterminal program can be used for this purpose. Otherwise, the open source program Putty can be used. This can be downloaded from here (for Windows) or from (Windows or Linux).

After launching Putty (putte.exe), click on "Serial" and then fill up the parameters as shown in the figure below:

Putty Serial Port Configuration-1

Then click on Serial and setup serial port parameters. Make sure to set the Flow Control to None.


Putty Serial Port Configuration-2

Then click on "Open". The terminal screen will be displayed. Hit the enter key a few times. You should see the letter "A". You can then different commands (depending on the device) to check the parameters.

Putty terminal screen


Remote Support

For help with any issues, go to and under Support menu option click on Remote Support. Download and install the app, and call us with ID and Pwd. We can then see your screen and try to assist you. Please contact us for help.


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