On 29 January 2011 09:24, Farzin Kamangar <farzin.kaman...@gmail.com> wrote:
> I would like to find out which Parallel port pins are on and which pins > are off between the computer power on and the time EMC starts. This is > essential for me because when I turn the computer on my spindle starts > turning and keeps on turning utill EMC starts Steve is right, the values on the p-port pins are undefined while the computer is booting so you should bring up the PC first. You can use a charge-pump enable circuit. This would only turn on main-relay power when there is an oscillating square-wave on a pin, generated by EMC2. However, it is likely that your machine will go through the same sequence every time, so you can _probably_ find some safer pins to use in your particular installation. You used to be able to get indicator plugs (a bit like this, but this is for a serial port http://www.techzonics.com/db25-status-indicator.jpg ) Now it is probably simpler and cheaper to put an LED with 1k series resistor between each pin and an earth pin, go through the boot sequence, note down the behaviour and repeat for the next pin. You will need the LED to be the correct way round. I can never remember which the correct way round is. -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
