The DB15 Breakout Board is designed for use with Roboclaw Motor Controllers. The board uses 2.54mm (0.1") male headers for the inputs. The breakout board has inputs for two encoders, two RC inputs, Rx and Tx for TTL serial communication. The four solder jumpers connect the quadrature encoder A and B pins to 1k pull-up resistors. Un-bridge these jumper connections if your encoder setup does not require pullup resistors.