Chilangisha: The USB port is designed ONLY for USB devices....there's no way to connect DIRECTLY RS-232 devices to that port... There are RS-232 to USB adapters, but I never tried one... here you have a link to one of them: http://www.ramelectronics.net/html/usb_serial.htm HTH Sergio : I have bought a computer that a USB port and a serial : port. I want to use this computer for multiple interface : like radiation and IV measurements. Is it possible to : connect a data logger or other RS 323 devices to the : USB port? : : Chilangisha : : Visit our website regularly for FAQs, : articles, how-to's, tech tips and much more : http://freepctech.com : Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://freepctech.com/pcbuild.shtml