On 04.05.17 20:43, Gene Heskett wrote: > On Thursday 04 May 2017 13:47:22 Chris Albertson wrote: > > Yes I agree conversion is cheap and easy, You can buy the Max chips > > on breakout boards with connectors for 50 cents each > > ebay.com/itm/2PCS-MAX485-Module > > <http://www.ebay.com/itm/2PCS-MAX485-Module-RS-485-Module-TTL-to-RS-48 > >5-Converter-For-Arduino/131694536431?_trksid=p2047675.c100005.m1851&_tr > >kparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D40130%26meid%3De5 > >19e5e6252c4e40b7d0fa2b19dcd5fc%26pid%3D100005%26rk%3D6%26rkt%3D6%26meho > >t%3Dag%26sd%3D112076449800> In most cases it is best to buy the chips > > on boards with connectors. Saves you from a lot of work.
That's a good find. I may buy a few, just to breadboard with before I get around to doing a board with ATmega328P and RS485 chip in one. > I agree. The only problem with this board is that its rs485 only. > Unbalanced IOW. No, not so, Gene. As already pointed out, RS485 is the multipoint version of RS422, so balanced enough to pass a "walk the dotted line" DUI test. ;-) Seriously, the 'A' and 'B' balanced line labels can be seen on the PCB at the above link. ... > And its data rate must be pretty slow, its slew rated but not in any > usefull way. Ah, yes, the MAX485 will limit you to 2.5 Mb/s, and tolerance of "improperly terminated cables" isn't something we'd need. The jabber about "reduced EMI" sounds dubious too, as properly terminated twisted pair ought not radiate alarmingly. > > People are using Cat5 (Ethernet cable) for all types of serial links > > now. It just works better as most links are now balanced pairs. Yes, a reel of that stuff is buried somewhere in any good components stash, I hold. Erik ------------------------------------------------------------------------------ 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
