ActiveWire Motor Control board ActiveWire Motor Control Add-on board Please refer to the pin diagram below. 20 NC Inputs are connected to the ActiveWire bus connector so that it can be easily plugged in to the ActiveWire USB board.
Output is high voltage high current bi-polar transistor driver.
See spec of the chip here . Each pair of drivers forms a H-bridge to control any DC motor forward and reverse. Enable input enables driver output. When Enable input is low, the pair of drivers is both high impedance, effectively disconnecting the DC motor from external power supply. The same applys to M- input.