I know its been a while since ive posted any updates on our project. We gave up the idea of using a usb to parallel converter and switched to usb to serial converter to send serial data from matlab to the usart pin of microcontroller PIC 18f452 at a baud rate of 4800. The pic sends control signals to control the motors of the robot. The problem that we are facing now is that it takes too long to open the serial port in matlab, more than 15 minutes. Once it is opened we are able to send the data accurately, but occassionally matlab crashes as well. Anyone got any why this is happening? (We are running on MS Windows Vista ,2.4GHz 3 GB ram dual core processor. The converter is Bafo usb to serial converter 810)