Install ferrite cores on each end of the USB cable, or use a shielded USB cable that has built-in ferrite cores.Use a shielded USB cable, at the shortest length possible to reduce electrical interference.Bypass any intermediate stops between the computer running cncjs and your Arduino (USB Hubs, Extension cables, etc.) and plug the Arduino directly into the computer running cncjs.Update your Arduino firmware to address a known serial communication bug:.Possible resolutions for data transmission issues may be: Console reports errors, but the sent line is valid GCode, as in this screenshot:.The toolhead is in a different location than the GCode indicated.A job finishes, but the web interface shows the job still in progress (the pause button is still lit and the start button is disabled).Web interface stops updating Axis positions although the machine is still moving.Some symptoms of data transmission issues may be: Experienced unexpected errors during data transmissionĮxperienced unexpected errors during data transmission.TURN OFF SPINDLE AND MOTOR POWER WHEN MAKING A DRY-RUN FOR TROUBLESHOOTING SERIAL TRANSMISSION.NEVER PLUG OR UNPLUG COMPONENTS WHEN THEY ARE POWERED.Please bear the following precautions in mind when troubleshooting: You may also want to visit the FAQ if your questions are about common installation problems. Please take a look at the following resources for troubleshooting. This page contains issues people have had trying to resolve.
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