On Sat, 4 Feb 2017, Andrew wrote: > Date: Sat, 4 Feb 2017 00:00:11 +0200 > From: Andrew <pkm...@gmail.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] 6I24 PCI or 7I80 Ethernet? > > 2017-02-03 23:05 GMT+02:00 Peter C. Wallace: > >> You need a RS-422 interface to connect a sserial device to the FPGA, so >> 7I44, >> 7I52, 7I47, 7I47S, or RS-422 interface chip on a little board like our >> 485X1 >> for just one channel >> > > >> But if you only have the OPTO racks and the step/dir pins, you should not >> need >> and sserial I/O expansion (unless it makes wiring easier to have the OPTO22 >> interface at some distance from the 7I80) >> > > Yes, I think I don't really need sserial... > > >> If its sinking current, yes, you can get 5V swings (so OK for drives with >> common +5 on the Opto inputs) if sourcing, it can only swing to 3.3V or so >> which is not so good. >> > > Good for me, the desired drives have common +5V. > >> >> Note that if you use bare FPGA I/O, a single wiring mistake will ruin your >> day... >> > > Sure, that's a risk... > I would take 7i47S if I needed an analog output... or 7i47 if I needed > encoders. > 7i42TA would do the job either? All would work
The 7I42 is just a I/O protector so doesnt change the FPGA drive capability but will protect the FPGA I/O from mistakes up to +-12V > > > Andrew > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
