A-phase, B-phase and Z-phase refer respectively to counter board input signals.
A-phase and B-phase are the names of signals counted on the counter board. The counter board counts these signals in terms of rising and falling, and the mode setting determines which change in the signal is counted.
Z-phase is the signal that clears the count value to zero.
To use the counter board, it is necessary to understand the significance of these signals, and set the software parameters according to the type of the input signal.