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