The STM is a drive+motor+control unit, fusing step motor, drive, and controller technologies into a single device, offering savings on space, wiring and cost over conventional motor and drive solutions.  The "S" models offer control options such as step and direction, analog input, joystick control, and serial host commands while the "Q" models add the capability of stand-alone programmable operation. Both models can be ordered with a 1000-line encoder that is integrated into the motor housing. Perfect for robotics, automated assembly, and automated testing.