Thanks, Pete, for your rapid response.<br>Im sorry for logging in as Anonymous before.<br><br>Via separate Mail you will receive an example of a trace showing the discrepancy between absolut and relative figures. The older thread "Explanation of PL%" does not fit my case, as I did hope before. <br><br>Im going to change Timeout, as advised, to lets say 5000.<br>in addition I probably will change interval from 25 to 50 msec, even being slower in performance.<br><br>Thanks again, good evening from Germany.<br>CU WBL<br><br><br><br>