So your existing encoders are differential output but not line driver compatible?
Perhaps you can hook one leg of your encoder output the the input of a standard line driver chip? There is a standard chip that everyone refers to as being equivalent to ____ for their encoder differential output specs. But there were some very nonstandard differential output encoders made for a time. Standard differential outputs from encoders are good for hundreds of feet when run in good shielded cable as twisted pairs. I've run singled ended encoders for a couple hundred feet in quality shielded cable. Not ideal but it worked. Dave On 3/19/2015 9:19 AM, Eric H. Johnson wrote: > Hi all, > > > > The short question: > > I am looking for any recommendations on a differential line driver module > for use with the encoder signals to the Mesa 7i33 quad analog servo > interface. I found this one, but it takes a single ended signal and converts > it to differential. My encoders are already wired differential. > > http://www.cncdrive.com/Difflinedriver.html > > > > Explanation: > > I am retrofitting a large gantry machine, where the existing system dealt > with this problem by mounting the amplifiers, power supplies and controller > on / in the gantry. With the components I need to add, that is a lot of > electronics I would rather not have in motion. Moving it to a panel on the > other end of the gantry e-chain means going through another 20' of e-chain, > plus whatever it takes to land it in the panel. The panel can be mounted > quite close to the end of the e-chain. Round trip, that is an additional > 50' or so for the encoder signals. > > > > The gantry is 16' wide, so the round trip distances to the respective motors > would roughly work out to: > > Y1: 55' > > Y2: 90' > > X: 90' > > A: 100' > > > > The Z axis is a two position pneumatic head, so does not require an encoder, > however there is a small amount of discreet 5V I/O that might have to run > similar distances, most of which would be no significant hardship to convert > to 24V. I am using the Mesa 7i37 board for this I/O. Also, as a rotary axis, > the A axis could home to the encoder index signal, the other axes don't > require the index signal. > > > > Any recommendations are appreciated. > > > > Thanks, > > Eric > > > > > <http://t.signalequattro.com/e1t/o/5/f18dQhb0S7ks8dDMPbW2n0x6l2B9gXrN7sKj6v4 > LCQRN7fcnk8RJ6s6N8rBF7Rd3_yKW18Chwm1k1H6H0?si=6453247850577920&pi=c7f8453b-1 > 91e-46df-8bed-5e58ae16bfc1> > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming The Go Parallel Website, sponsored > by Intel and developed in partnership with Slashdot Media, is your hub for all > things parallel software development, from weekly thought leadership blogs to > news, videos, case studies, tutorials and more. Take a look and join the > conversation now. http://goparallel.sourceforge.net/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
