The box contains one large PCB with all the electronics including power supply,
drivers, and breakout/interface functions. Other than that, a transformer, power
connectors, a fan, and the E-Stop switch. Internal wiring is minimized as much as
possible.
The motor drivers are short circuit and disconnect/reconnect protected even under
power, so replaceable driver modules are not needed.
If you want to use Mach4 and USB, the PMDX-411 will plug directly on the back of
the PMDX-340.
