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