Astrosyn's new digitally controlled stepper motor driver features an integral 70V power supply, making it easier to integrate into systems that do not provide such a high voltage dc rail. The step and direction driver provides a micro-stepping output of up to 5A, with its status displayed on a seven-segment LED. All the digital inputs and outputs are optically isolated and DIP switches allow functions to be set by the user. The unit is capable of driving a motor in open velocity and position loops, according to internal or external acceleration and deceleration ramps.