On Tue, 13 Nov 2012, Viesturs L?cis wrote: > Date: Tue, 13 Nov 2012 23:08:36 +0200 > From: "[UTF-8] Viesturs L?cis" <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Subject: [Emc-users] Differential signal from encoders > > Hello! > > I somehow had skipped the fact that encoders on servos have > differential signal output, but 7i39 cards expect single-ended signal. > Since that is plasma machine with all the noise from plasma, I do not > think that using only half of the differential signal is a good idea. > > I was thinking that I could try making a 422-to-ttl converter, based > on the scheme in top-left corner of this sheet: > http://www.kmitl.ac.th/~kswichit/Rs422/Rs422.pdf > > I just would like to ask, if other list members have some experience > with this - I like to make sure that I am not going to build some > rubish before I have actually taken soldering gun, so I would > appreciate any input on this. > > Thanks! > > -- > Viesturs
You can do the whole encoder interface with a 26LS32A chip (4 channel RS-422 receiver) Here's a sample schematic freeby.mesanet.com/422enc.pdf On the other hand TTL may be OK if your count rates are not too high. (so you can set the encoder digital filter to reject HF noise) > > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > Monitor your physical, virtual and cloud infrastructure from a single > web console. Get in-depth insight into apps, servers, databases, vmware, > SAP, cloud infrastructure, etc. Download 30-day Free Trial. > Pricing starts from $795 for 25 servers or applications! > http://p.sf.net/sfu/zoho_dev2dev_nov > _______________________________________________ > Emc-users mailing list > [email protected] > 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. ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
