ok = open_serial(1, 2, 115200)   //COM port is 2 and baud rate is 115200
cmd_dcmotor_setup(1, 3, 1, 9, 10) // Setup DC motor of type 3 (L293D), motor 1, pin 9 and 10
cmd_dcmotor_run(1, 1, 100)       // Motor 1 runs at PWM 100
sleep(3000)                    // for 3 seconds
cmd_dcmotor_run(1, 1, -100)      // Motor 1 runs at PWM -100 in reverse direction 
sleep(2000)                    // for 2 seconds
cmd_dcmotor_release(1, 1)       // Motor 1 is released
close_serial(1);