On Fri, 3 Feb 2017, Andrew wrote: > Date: Fri, 3 Feb 2017 22:53:11 +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 22:41 GMT+02:00 Peter C. Wallace: > >> Yes, you can use OPTO22 racks with any of our 50 pin FPGA cards (except the >> 4I68 since its I/O is not 5V tolerant). If you have a lot of OPTO 22 >> racks, a >> 7I90HD can be used as a sserial remote and drive 3x 24 I/O racks >> > > Thanks Peter. > I looked at 7I69 too, because the machine has 2 extra opto22 racks (but > they're almost empty). > > I guess 7i80hd_16_st12.bit should fit? > Does it support sserial? How do I connect sserial board to 7i80HD, just in > case?
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) > > Also, is 7i80HD output voltage enough to drive an optocouple in a stepper > drive? 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. Note that if you use bare FPGA I/O, a single wiring mistake will ruin your day... > > 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
