It is possible to output for A, B, Z phase by encoder which is applied to Ezi-SERVO.
Conventional Open Loop Step Motor does not have Z phase output but it provides magnetization timing signal output(Phase magnetization origin signal). But it only can provide usable signal under low speed range and only 50 signals generated by 1 motor revolution(It depends on type of motor), so very difficult to use it as origin signal.

However Ezi-SERVO is Closed Loop System which is attached encoder at step motor, so it can output Z-phase. Also, it is possible to output the encoder signal of A-phase and B-phase at the same time. Because of that, it receives a moving position from the host controller and then can check the position.