Ethernet Smooth Stepper - ESS
The Ethernet SmoothStepper (ESS) is a high-performance, 6 axis external motion controller for Mach3 and Mach4. It integrates seamlessly with most devices that the Parallel Port driver of Mach interfaces with. It accepts high-level commands from Mach and produces Step & Direction signals that are compatible with nearly all step & direction motor drivers...
USB Smooth Stepper - USS
The USB SmoothStepper (USS) is a 6 axis motion control device that connects to the USB port of a computer. It accepts commands from a trajectory planner (i.e. Mach3) and produces a very high quality pulse train to stepper and servo motors...