Handheld debugger operation steps：
※ After power on, if the communication is normal, the NOR green light is on. Communication failure, COM red light is on. Drive failure, fault light on.
※ In case of communication failure, please check whether the cable is loose and whether the cable in DB9 falls off. When the driver fails, please check the wiring between the motor and the
driver, whether the power supply voltage is normal, whether the load is too large, and whether the motor is stuck.。