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'Checksum failed' Error when Transferring Data to Windows XP


When downloading data from the instrument this error message appears:

'Checksum failed. There appears to be a communications problem.'


We have experienced some instances where brand new computers, often with fast processors, do have some communications difficulties. There is a known issue in the Windows XP system that causes duplication of received data packets. This in turn causes the failure of the serial communication data transfer checksum.


  1. If not already using the last version of software, Profiler MAS 5.13,  download and install the latest software from the discontinued produces section of the Commtest Website.  If this does not resolve the problem proceed with solution 2 below.
  2. If your software fails with Windows XP but worked well under a previous version of Windows, try using Windows Compatiblity Mode. Compatibility mode emulates previous versions of Windows such as Windows 95, 98, Me, 2000 or NT 4.0. When Windows XP is run in compatibility mode it will 'pretend' to be a different operating system so that older software will continue to run on it.
  3. Note Profiler MAS has not been designed to operate with Windows Vista or Windows 7.

To try and fix the problem follow the steps below.

  • On the Windows Start menu navigate to the submenu containing the MAS icon. Right-click this and select 'Properties'.

  • Click the 'Compatibility' tab to see the available options.

  • Click 'Run this program in compatibility mode for:' and select an operating system from the drop-down list that you have previously used to run MAS successfully.
  • Click OK to apply the settings and close the window.
  • We recommend that you also modify your MAS desktop shortcut to prevent anyone accidentally running the program in the incorrect mode. Right-click the desktop shortcut, select 'Properties' and carry out the same steps as previously.
  • Start the Ascent program to test if it works okay and if necessary change your selection to a different operating system until you find the compatibility mode which offers the greatest stability.