On Wednesday 03 May 2017 22:29:43 Chris Albertson wrote: > 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.
rs485 is the single ended cousin. Could a atom board keep up with that with a pci-e rs422 card in it? That does have a bit of an attraction, particularly from the noise safety dept. Silly Q: can the pi do rs422 over its gpio? > > 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 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
