Commanding a Stepper Motor Controller over USB

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http://stackoverflow.com – I am trying to do some experiments on the Trinamic StepRocker Stepper Motor Controller in Gnu/Linux. I had attahched the device through USB to a Windows machine previously and used Trinamic's proprietary software to test if the controller is functional as expected, and it seems to be. The beginner's manual of the StepRocker mentions certain commands that should be sent over the serial interface to rotate the motor left, right, or bring it to a halt. But when I connect this controller over USB to a Gnu/Linux computer, and want to write my own C++ (libusb) program to make the motor move, I am no (HowTos)