I am trying to write multiple lines high

Question

I have LV 5.0, PCDIO-24 card & WinME
I am trying to write multiple lines high, but when I write one high
the others reset. I read about the 8255 chip problem & found an
example vi on NI's website that maybe a work-around, but it won't run
with 5.0. I am somewhat new to Labview and request help! How can I
open "Write to Multiple Digital Lines.vi" with 5.0,
or does someone have an similar example vi?
My vi has 3 different delay timers that try to write data high when
they countdown to zero. They work fine one at a time but not when I
put them into a single vi and run them all at once.
Thanks,
MikeB

Answer 1

Dennis Knutson wrote in message news:<[email protected]>...
> I think your problem is that you're using something like Write to
> Digital Port.vi which writes to all lines. Use the lower level
> function DIO Port Write.vi and set the line mask. The line mask is
> used to determine which lines to write to and which lines to leave
> alone. For example, if at one point you just want to write to bits
> 5,6,7, set the line mask to 1110000 (assuming 8 bit port). If at
> another point, you just want to write to bits 0,1,2, you would set the
> line mask to 00000111.
When I try to set the line mask of "DIO Port Write.vi", it won't allow
me to have a 0 as the first digit. If I enter 00001111 for example,
the zeros dis
sappear as soon as I click the check-box. (the line mask
box will reset to 1111). What am I doing wrong?
Thanks for the help!
MikeB