The way you have the RS485 wired with the two other resistors does bias it in that direction. I disconnected the two wires and left them floating and step/dir still function. Definitely not what we want. But if you didn't have the two resistors around the 1K would the output not default to low? Normally termination for an RS485 circuit is between 100 and 120 ohms.
John > -----Original Message----- > From: Rene Hopf [mailto:reneh...@mac.com] > Sent: April-04-18 4:16 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] ESTOP and Drive Enable handling. > > > > On 4. Apr 2018, at 21:57, John Dammeyer <jo...@autoartisans.com> > wrote: > > > > The STMBL AC Servo drive I'm currently working with has an ENABLE high > input. So when Low it's disabled and stepping pulses can't move the motor. > > its not supposed to be like that. it should be active low. I will ad a inverted > pin to the software. > I didn't think about the fact that rs485 termination defaults to 1... > you are the first one using the diff enable signal, most use the smart serial > connection, and the one setup with step/dir uses a single ended input as > enable. > > Rene > ---------------------------------------------------------------------------- -- > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
