... r,A/B/Z differential signalPosition feedback outputMotor encoder or spindle encoder signal 1:1 output, A/B/Z ... overvoltage, undervoltage, overspeed, overcurrent, overload, overheat, abnormal encoder and so on.Display function6-bit LED,displaying software/hardware ... version, workingmode, current speed, speed command, encoder position/state,current, torque, I/O state, busbar voltage ...