The LK-MD2102 is a driver board that controls the direction, speed and preset positions of two stepper motors. The driver is controlled over RS485 using the Pelco-D protocol. A dedicated stepper driver chip provides 2, 4, 8, 16 and 32 microstepping, with selectable automatic half-current hold when the motor stops. Output current is continuously adjustable from 0 to 2 A and the decay mode is configurable. Limit-switch inputs stop each motor automatically when a limit is reached. The power input and motor outputs are protected against overcurrent, and the control and communication ports have ESD protection. Operating voltage is DC 9-24 V.