Viesturs Lācis wrote: > 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 > That drawing uses some very old parts, and may no longer be obtainable. I've been using AM26C32 receivers in several boards and they work well and are good up to encoder frequencies. You should have a 100 - 120 Ohm terminating resistor at the receive end, between the + and - signal lines.
US Digital makes tiny boards with these or similar chips on them. Jon ------------------------------------------------------------------------------ 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
