It looks like a FTDI driver problem.
Try the followings:
1) reinstall the USB to serial driver?
(http://digital.ni.com/public.nsf/allkb/FD238ED75B22740B86257315004E35FE)
2) use other serial COM reading code like .NET to test whether there is
incoming data on the particular port.
3) use the tos-pr
Has anyone used serial port communication to a telosb mote
under Windows 8? I have a program that works fine under XP
but I don't seem to be able to get the right FTDI driver magic
under 8. We, may have, followed the instructions for loading
their VCP driver. When the program starts it detects that