You can not set the 5i25 to supply power to an ordinary breakout board made for a parallel port, because the pins used for suppling the power are used as grounds and are (usually ) all tied together on the breakout. (You'd short the 5v rail of your PC through the 5i25.)
But there are separate jumpers on the 5i25 for setting 5v power for each port. So you can power either one separately or from the 5i25. (see pg 2 of the manual for the 5i25) -----Original Message----- From: Gene Heskett <[email protected]> Sent: Thursday, December 12, 2019 12:17 AM To: [email protected] Subject: Re: [Emc-users] Need a power signal independent of linuxcnc. I also do not know if feeding a std BoB with 5 volts from the 5i25 can be done via the 5i25 jumper settings as ISTR ringing one out years ago and finding that all 8 wires in the db25 were indeed ground, so enabling the 5i25 jumper can only be done if the BoB on p2 is a suitably wired mesa card. These are not, they are both std BoBs. Instantaneously I suspect only Peter can comment to that concern today. Now if that 5 volts jumper on the 5i25 only switches P3 and the 7i76D we're home free by enabling it, but if it also switches P2, we just smoked the pci buss and the 5i25 because a stock BoB uses all 8 ground lines and would be a very low R short on the 5 volts being fed out by the 5i25. The computer I was using for email while ordering stuff for this one, was in the midden heap because it wasn't supplying 5 volts to the slot the 5i25 was in. And its possible that was caused by the jumper being enabled with a std BoB on p2. It happened while rebuilding that interface originally. So I think this needs clarified by Peter. Does that jumper switch P2's 5 volts on the 5i25? If it does, I can't use a std BoB on p2 without breaking the "now" 5 volt pins off in the db25. _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
