What's the maximum step rate you are using? Depending on the rate you can probably use either RS485 drivers/receivers or CAN bus transceivers. The RS485 is true differential while the CAN bus is pseudo differential relative to ground but good to 1Mbps.
In both cases, inside shielded twisted pair, those distances aren't a big issue. CAN bus drivers require 120 Ohm impedance cable. RS485 can use cheaper 100 Ohm impedance cable. Properly terminating each end with the cable impedance (120 Ohm at each end for CAN, 100 Ohm at each end for RS485) will result in a clean step/dir set of signals. You could even use the Ethernet Cable with RS485. That would be my first try. Those sorts of distances are run all the time for DMX-512A light show controls with a bit rate of 500kbps. John Dammeyer "ELS! Nothing else works as well for your Lathe" Automation Artisans Inc. www.autoartisans.com > -----Original Message----- > From: Davide [mailto:[email protected]] > Sent: May-19-19 7:26 AM > 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. > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
