If you're talking about interfacing RS-232 to TTL levels, then any of the MAX232 style devices will do it -- but generating operating power from RS232 is genera bad idea. The drivers aren't designed to provide much current, only several tens of ma's.
On Thu, Dec 27, 2012 at 3:11 PM, Kent A. Reed <[email protected]>wrote: > On 12/27/2012 5:50 PM, Gene Heskett wrote: > > Greetings; > > > > I have now spent several hours doing google searches, looking for a chip > > that would be the reverse of a max232, so I can power this ttl based > > sparkfun thing from what is available from the serial port. There appear > > to be hundreds of variations on how to get from 5 or 3.3 volt powered > > motherboards to a serial ports voltages, but nothing to reverse that > short > > of find an old ball mouse at a flea market and stealing the chip out of > it. > > > > Unforch, I have attempted to look some of those chips up if they were > > marked, with zero luck. Most of that stuff was never a JEDEC registered > > chip design it seems. > > > > Am I going to need to invent what should be just another wheel? Any > chance > > there is a ttl level serial port on a header someplace on the D525MW > > boards? > > > > Cheers, Gene > Sorry, Gene, I've lost the bubble. What is the Sparkfun thingy you are > working with? I'm looking at their website but your description over the > last few messages don't get me to a specific product. > > Since the max232 is a bidirectional device, I would have thought it > would suit what I thought you are trying to do. So maybe I don't > understand what you are trying to do. > > Regards, > Kent > > > > ------------------------------------------------------------------------------ > Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, > MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current > with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft > MVPs and experts. ON SALE this month only -- learn more at: > http://p.sf.net/sfu/learnmore_122712 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnmore_122712 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
