I doubt you really want opots on an encoder. The data rate can be VERY high. Also, I bet these encoders are already using LEDs and phototransisters. Just power the DRO from the same supply as the interface it is connected to.
The price is very good. I did not know glass slide DROs ad come down in price this much. On Fri, May 8, 2020 at 8:18 AM dave engvall <dengv...@charter.net> wrote: > HI all, > My ancient Acu-rite III DRO has gone flaky. I ordered one off the > following link. > > > https://www.ebay.com/itm/2-3-Axis-Digital-Readout-DRO-TTL-Linear-Glass-Scale-Encoder-for-Milling-Lathe-US/383318755364?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D226424%26meid%3Dcfa3ce45df724f6caf6f3f9e3f504aca%26pid%3D100005%26rk%3D2%26rkt%3D12%26mehot%3Dpf%26sd%3D143473346840%26itm%3D383318755364%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWebWithBBEV2bDemotion%26brand%3DUnbranded&_trksid=p2047675.c100005.m1851 > > The instructions give two possible connection patterns: both for A+, B+, > gnd and +5v. No instructions for A+, A-, B+, B-, gnd and +5v. > No joy. An internal autoresetable fuse saves idiots from themselves. I > emailed the vendor and got back a 'yes we have no bananas' type answer. > > "Hi David, thanks for your shopping in our store. > So pleased to serve for you. > Yes, it's no need to do that without having to use opto-couplers to > isolate the connection. > Best regards, > Ebay seller-tradeparts-shop" > > I'm still convinced that I need the opto's but thought I'd bounce this > off the list. > BTW - it works fine with one of their scales. > > Once I get both types of scales going I will do a comparison against > each other and against Jo blocks and boring machine standards. > > Has anyone else tried these and how did you make it work? As always > thanks in advance. > > Dave > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
