> On Sun, 19 May 2019, Davide wrote: > > > Date: Sun, 19 May 2019 16:26:26 +0200 > > From: Davide <[email protected]> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <[email protected]> > > To: [email protected] > > Subject: [Emc-users] Unusual help request. > > > > Hi, I have a strange setup to solve. So I'm asking you an help, on the top > > of your knowledge (sorry for any language mistake) Some time ago I have > > built an inverted wire tetrapod, which was made by 4 winches placed at a > > max > > distance of 20 meters one each other in a rectangular shape. So until now > > it > > was ok to have a 48v 20A DC power supply and a parallel bob near my pc (an > > asrock q1900b-itx), and transmit step/dir signals thru ethernet cables to > > the stepper drivers inside the winches. > > > > Now I have to modify that to make a very little object fly inside a soccer > > arena, so the motors will be placed at 80 meters one each other, and i'm > > really worried that a step every 10 will arrive to the drivers, if any at > > all.. The further motor will be at 150mt if I'm lucky.. > > > > An idea can be a mesa ethernet card, but I should use 4 of them, so I'm > > asking you if you think is possible to make 4 of them work with linuxcnc? > > > > Another can be convert in some way step dir signals to optic fiber > > transport. But i couldn't find anything to buy. > > > > Any other suggestion? > > Thanks, Davide. > > > > > 150 meters is no problem for 100 KHz RS-422 (Spec is 1220 meters at 100 KBPS > ~= 50K steps/second) So just using good line drivers/ receivers should be fine > It may even work with differential drivers and normal opto-isolated step > motor > drives driven differentially
You might also need terminators to avoid reflections. _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
