I dug into this a while back and as I recall most of the recent integrated parallel circuits can sink at least 12 ma, but some can only source 3-4 ma.
http://www.beyondlogic.org/spp/parallel.htm Many cannot source anything close to 14 ma. I've been able to treat them as open collector outputs without problems so far. Even as far as pulling them up to 5volts - even if it is a 3.3 volt port. Dave Kirk Wallace wrote: > I have been trying to get a handle on what kind of signal to expect from > a parallel port. I have been used to expecting around 3 mA, which may or > may not source the current, and may be different between data and status > pins. This link seems to indicate 14 mA source and sink: > http://www.fapo.com/1284elec.htm > > I assume this link is based on the 1284 standard, so I should use that > as my reference? > > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
