The intelligent stepper motor iSMIF USB interface is used to connect the stepper motor control cards SMC800 / SMC1500 to the PC, as well as the commercially available stepper motor control amplifiers via the serial USB interface. The interface includes a microcontroller, which directly generates the drive signals for the stepper motor control cards SMC800 / SMC1500, however can also generate clock and direction signals for standard stepper motor amplifiers The stepper motor interface is designed so that it can be programmed using simple control commands. The control commands can be executed directly, however are also stored in the read-only memory It can store up to 7 programs in read-only memory. The program flow can be controlled with the start - stop - pause - inputs.