On Fri, 1 Jan 2016, Bertho Stultiens wrote: > Date: Fri, 1 Jan 2016 14:55:47 +0100 > From: Bertho Stultiens <ber...@vagrearg.org> > 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] Smart-Serial cabling > > On 01/01/2016 12:23 PM, andy pugh wrote: >> Is there any reason to think that the 2x3 screened pairs in that cable >> will be unsuitable for transporting smart-serial data > > The bandwidth of rs232 style serial connections is so low that you will > not see any problems with twisted pairs. I assume that you are not > connecting half a kilometer of cable with a speed higher than 115k2 baud > (or you may run into capacitive loading problens). > > Pairing TX and RX with a GND may actually improve noise immunity. But > the cable is already well shielded.
SSerial is differential RS-422 at 2.5 MBits/sec and requires ~100 Ohm differential cable cable impedance. This usually means twisted pairs are required for TX and RX (the 5V/GND power connections are not critical) > > >> (if I can persuade an RJ45 connector on to them)? > > That is actually a hard thing to do on these cables. The isolation is > very hard and does not bend easily. Standard crimp-connectors will be > almost impossible to attach while ensuring a mechanically stable > connection. There is also a minimum bend-radius which can be rather large. > > These cables are normally used as distribution cables and go into female > plug assemblies with seperate holding facilities for the cable. > > > -- > Greetings Bertho > > (disclaimers are disclaimed) > > ------------------------------------------------------------------------------ > _______________________________________________ > 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. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
