Test of a USB to Parallel converter using the latest software version on :
3 different Win XP computers (1.2, 1.3,1.6GHz + USB1 and USB2 )
2 DrDAQ modules
any combination leads to the same deffect:
approx 15 sec latency occurs between clicking GO and getting the signal displayed
an equivalent latency exists for 200ms/div but timewise 90% of the signal is missing (never displayed)
The same tests carried out while connected to the // port gives no latency
and the signal appears on the whole width of the display namely over the 2 sec duration for a 200msec/div selection.
What can explain such a huge difference?
a) everything works fine with the // port
b) absolutly unusable with the USBtoPARALLEL interface
Obviously, the other USB ports were not connected to other devices