On Friday 05 May 2017 17:47:05 Gene Heskett wrote: > On Friday 05 May 2017 11:45:49 andy pugh wrote: > > On 5 May 2017 at 15:52, Gene Heskett <[email protected]> wrote: > > > Since this stuff is best described as volatile, I'll buy the 5 > > > pack so I've some to "play with". > > > > What do you intend to do with this RS485 interface? > > I don't know yet Andy. Gotta see what it can do speedwise first. > > Cheers, Gene Heskett
Well, plugged into a usb port on that old slow sheldon, I get rise and fall times of the A signal out in the 16ns area. And I'll have to plead oldtimers because I could not remember the name of the serial port config daemon, stty, which is currently doing 9600 baud. Now to go back out and see how fast I can make it run. Back eventually. It seems that "stty -F /dev/ttyUSB0 460800" still sends pretty well defined data, which my scope says is a red hair over 2 us for character time, and inverts that to 460.2 kilo baud. Now, the cat5 socket on the 7i90 is an 8 line, even POE, full duplex, A&B send and separate A&B rx. Since all these so-called adaptors are only 3 wire half-duplex, and assuming the use of a regular db9 serial port with "7 wire protocol which is full duplex", is there anyone making a plug and play, using 2 of these adaptors, gizmo that just works? My attempt to make a new card for the pi, ends up with exactly the same error. Thats 5 passes at recovering what was working quite well the morning of 2 May. No one can believe me that the 13 file update done later that morning, bricks the pi's. I'm very impressed with the lack of data on the up-shop.net web site as to just what these atom powered things have, they don't even say how wide the gpio count is, so I may have bought a very lightweight paperweight, but the card was accepted for one just like Erik said he had bought. 2 gigs of ram, 16gigs of eMMC for a disk drive. $124 shipped. With suitable drivers, all running x86/intel code, its promising. The forum is loaded with this and that don't work messages though. I don't see a debian for downloading but I'd prefer it, jessie is close to EOL, and rumors are saying stretch is fairly stable now. Theres some sort of a ubuntu I never heard of, yocto (whats that?) and whatever is running the fawncy phones these days. Cheers all; Gotta hit the grocery store. Out of eggs. 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
