Quote Originally Posted by natxo View Post
What I understand is that pins 2 to 9 from the LPT1 connector are the ones which send data, I'm ok? Are this the pins which DirectRT uses to send information? Or this depends on which PC it is running?

I need to build a connector so I need to know which 8 pins I should select

thanks again
Those 8 pins will be common to any PC containing a parallel port.

If you only need a single trigger line, I'd select 'D0' for convenience.

Then, by sending the value '1' or '0' to the PC's parallel port, you'll be able to control the state of that particular pin, either high or low.