Flexi-HAL CNC Controller

Changelog

A4 Revision

Initial Release

A5 Revision

Added HALT signal polarity selection.
Modified RS485 UART isolation for better compatibility with more VFDs under LinuxCNC.
Added jumper resistor option to route STP_ALARM signal to B limit switch input.
Depopoulated isolation bypass headers to prevent magic smoke escape.
Added termination resistors to encoder input to improve signal integrity.
Added additional overvoltage protection to external circuits.
A6 Revision
Fixed silkscreen issue on Probe and Tool ports.
Updated silkscreen to clarify copyright permissions on Expatria and FlexiHAL names.
Added solder points to USB nets on top layer.
Changed encoder routing for better signal integrity. Pinout is unchanged.