Could be the two USB devices interfering with each other.
Try a different USB port for one of them.
I have also problems with UC100 sync errors...
but I think it is a problem with my USB dongle?
if I run my machine, but I change my spindle speed with the buttons on the VFD it works alright.... if I do it with the RS485 dongle I have sync errors every time in press the Up/down speed buttons a couple of times... als if in fill in a other speed and press enter... sync error!!
here you tube movie:
I think I go buy a other rs485?
Could be the two USB devices interfering with each other.
Try a different USB port for one of them.
Gerry
UCCNC 2017 Screenset
[URL]http://www.thecncwoodworker.com/2017.html[/URL]
Mach3 2010 Screenset
[URL]http://www.thecncwoodworker.com/2010.html[/URL]
JointCAM - CNC Dovetails & Box Joints
[URL]http://www.g-forcecnc.com/jointcam.html[/URL]
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
already try that.... but did not change, keep the same problems...