There are three types of external pulse inputs, including PULSE+SIGN, CW+CCW, and AB phase pulse? 1) Pulse + Direction: operation speed is determined by the frequency of the first pulse command. Second pulse input will decide Forward or Reverse command, high voltage for forward and low voltage for reverse. 2) CW+CCW: operation speed is determined by the frequency of the pulse command. Forward command is decided by the first command input and reverse command is by second command input. 3) AB phase pulse (encoder): operation speed is determined by the frequency of pulse command x1, x2, or x4. When first pulse command leads before the second one, the command will be forward. When second pulse command leads before the first one, the command will be reverse.