According to the 7i90 user manual the RS422 interface is at least 2X faster than the SPI interface. Mesa claims these speeds
Parallel Port ~1Mbit/sec SPI 1~5 Mbit/Sec RS422 10 Mbit/sec If you use a standard Intel board you can buy a PCI card that does RS422 and send data at 10Mbits over a cat5 cable. You can also power the 7i90 using the same cable You'd get the best bandwidth by using RS422 but the cost is higher because you'd need the intel PC and the serial and graphic cards. RS422 is balanced and opt isolated at the Mesa card end so you likely have better noise resistance then with SPI. On Wed, May 3, 2017 at 7:02 PM, Gene Heskett <ghesk...@shentel.net> wrote: > On Wednesday 03 May 2017 17:11:02 andy pugh wrote: > > > On 3 May 2017 at 20:22, Gene Heskett <ghesk...@shentel.net> wrote: > > > What x86 board, suitably small but not that outpriced yudoo thingy, > > > will run linuxcnc well AND can do the spi thing? > > > > I doubt that you will find an x86 PC with SPI. (though I could be > > wrong). > > > > But the 7i90 can also do EPP. > > Sure, but whats the bandwidth of a parport? 50 kilobaud equ maybe. When > the FCC with its radiated noise regulations got done about 20 years > back, I could not drive a parallel port printer with a coco3 as its > active time for both data and strobe was too short to get thru the > filters in the printer, and had to switch to a serial printer. A 1.79 > MHz clock, active for half a cycle. Printers printed about every 3rd > character. > > BUT, Got nother problem tonight, I can ping the buildbot, but cannot > connect with a package manager. Its rejecting http access. I don't have > a recommendation as to the proper size of brogan to reboot it with. > FWIW, it pings just fine, averaging 85 milliseconds from here in West > Virginia. > > I have one card left that will boot it, so I believe I am going to dd > that puppy to a file on the usb hard drive thats plugged in and > recognized. And then reburn (and check for boot function) the other 4 > cards so I'll have some backups. I don't believe the cards have failed, > but that the update that replaces almost everything in the /boot > partition has a bad file. > > I see what was meant about x86 vs spi, a good comparison to dentist's > specializing in hens teeth, it seems all the x86 boards have the spi > rigged to handle only a bios update, and can do it on an otherwise DOA > board. Thats one hell of a screwup IMNSHO. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > ------------------------------------------------------------ > ------------------ > 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 > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ 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
