signal detection on pins of parallel port

[studentin]

hello,

i am using the outport.vi in order to write to the parallel port of my windows 98 pc. I am writing a value to the port register. To detect that, i am trying to detect a signal change directly on the pin of the parallel port using an oscilloscope. I don´t detect anyhting although the vi ran without complaining. What am i doing wrong ?

saludos
miriam

[waldemar.hersacher]

Hi miriam,

I never used the access to parallel port from LV but from C based programs. As I know outport should do under Win 98.

Are you aware that the port nubmer is in Hex? The address can change if you have one or two parallel ports in your machine.

If you have one port it is 0x378 for LPT1.

If you have two ports it is 0x278 for LPT1 and 0x378 for LPT2.

Waldemar