The panel checksum number is a unique identifier of the configuration programming stored within the panel. When a download is taken using PC-NET-022 software, the checksum number is displayed on the download and matches the panel checksum number (until programming changes are made).
If no configuration changes have been made and the configuration is uploaded to the panel, the checksum number would change if a different version of configuration tool was used to upload.
For example, if a download was taken using PC-NET-022 v12.1 and an upload was complete using PC-NET-022 v12.2, the checksum would change even though no programming changes were made, as the configuration software versions are different.
A change has been made so the checksum number remains the same when a different version of configuration software has been used to upload into the panel, unless a programming change has been made.