I am not impressed with the speed of the VISA Read vi in LabView 7. Reading only 45 bytes in a tight loop I can only read at about 20 loops/sec, even though when I 'scope' the input line the data is finished being aquired long before the loop begins again. Even at 115.2 Kbaud. I have tried selecting the 'Do I/O sychronously' but it does not help. Why is it so slow (I am trying to run at 40 loops/sec which is only 45 bytes X 40 = 1800 bytes/sec)?
I am thinking about buying a 3rd party COMM driver *.DLL and using the Call Library Function Node to get faster response. Has anyone done that? I am considering the COMM-DRV/Lib software from WCSC(Willies Computer Software Company). Has anyone used it? They say many people have used their software with Labview. Thanks.
