I cant get all data from com port in Dell Optiplex 9010- on each other computers I can read all data from com port, but on this Dell model no. I change all COM port settings on BIOS, on Windows 7, but still can not read all data comming on this port. When I use RS232-USB converter I can read all, on hardware Com port no. System is Windows 7 Pro 64 bit. Where is a problem???