On the current version of xPro V3 the grbl setting $ must be set to a 1.....my board was defaulted to a 0 and would not work. Jeff
We have communicated that with XPRO team a while ago, and they have updated their documentation to reflect: Always a good idea to refer to the documentation before using a product: 5. Troubleshooting · Spark-Concepts/xPRO Wiki · GitHub