The machine is an ORAC lathe. Got a spindle vfd hooked up the the pc via rs485 adaptor and the tool changer via an arduino on the breakout board digital pins.
If I clicked my interface button to start and increase the spindle rpm, the tool change command fired. But if I subsequently sent a manual tool change command, the spindle stops.
My question: how do I stop the tool changer from activating when the spindle starts? (Also, the M6 command no longer seems to trigger a tool change since the last time I looked at this machine)

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