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?
The ITX boxes I use will simply not drive even the 'low current' opto isolated breakout boards. I've switched to using a proper buffer on the parallel port, powered by the USB from the computer, and THAT drives any optos if they are needed ... -- Lester Caine - G8HFL ----------------------------- Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk// Firebird - http://www.firebirdsql.org/index.php ------------------------------------------------------------------------------ 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
