Development for USB

Hi,

I am working with Sun Solaris 9(Generic_112233-07 sun4u sparc SUNW,Sun-Blade-100)and I need to develop the USB part in our application using C/C++.In our application,we are monitoring the UPS by Serial port and now I have to develop the USB part to mointor the UPS.
So I need your help to understand the following things--

Please help me...

Thanks in advance