problems in timing with serial communication

[Wolf Rueckwart]

During measurements with a serial communication the timing of the measurement is not correct (delayed about 5%). The displayed time (graph) is reduced about 25 % what means during a measurement period of 24 h the curve shows only 18 h.

[Alejandro_del_Castillo]

Wolf,

A couple of questions to better understand your scenario:
-Are you using GRAPH or VIEW?
-Are you getting your data from LabVIEW or are you acquiring from DIAdem?
-Have you checked the raw time values? do they look correct? (All the way to 24 h)

Alejandro del Castillo
NI

[Walter_Rick]

Dear DIAdem-User,

the data acquisition via serial port doesn't work with the interrupt functionality but with polling. That means that DIAdem is waiting until your front end comes back with a value. So it is possible that there is an delay between the clock rate you set and the clock rate of the communication. But to verify this more exactly I need more detailed infos about the front end, the DAC scheme and the DIAdem you are working with.

I hope this will help a little bit.

Walter Rick

[Henrik at Saab Automobile]

Dear Wolf,

It might be caused by the powersave functions on your computer. There are workarounds for this problem and you find them in DIAdem Help. Search for "CPUTraffic" !

regards

Henrik