krlin wrote:
> Please, be more specific!
> I have Windows 98, and i have two kind of signals on input: 1. multipleksed
> signal ( TTL ), 2. just logic 0 or 1
> ( TTL ) ; on output i have logic 1 or 0 (simply digital signal) .
>
> Thanks!
>
> Joe
>
>
Joe,
try this article on ni.com
http://zone.ni.com/devzone/conceptd.nsf/webmain/72C6FC6CE4AD4D1386256B1800794596?opendocument
if the above link doesn't work search at ni.com for:
"Using the Parallel Port in LabVIEW"
Myself I would tend to use the lower level "In Port" and "Out Port"
instructions. The PC's LPT Output port (8 lines) is usually at address
378 or 278 Hexadecimal with 5 input lines available at address 379 or
279 Hexadecimal.
Your problem may be in dealing with the timing especially of your
mu
ltiplexed (as you describe it) signal. This is mainly because all the
timing functions will have to be handled by LabVIEW software. In my own
experience dealing with signals faster than about 2 - 10ms can become
difficult and I don't think NI recommend working anywhere near this fast
because Windows can interfere with background tasks such as mouse
movements etc. Anyhow the specifics will depend a lot on your
application so I would recommend the above article and take it from there.
Regards,
Dave R.
