gm862 usb driver not work

hi

I like to use gm862 usb type eval kit (GM862 Evaluation Board - USB)and I connect the device with my computer. unfortunately, I cannot make communication channel.

I like to check if the usb driver is correct. in the tutorial, the driver should be sfe usb driver but in sparkfun website, the usb driver for GM862 Evaluation Board - USB is FTDI usb driver but using this driver, I cannot make channel for RS232. in tutorial, usb driver can convert usb to rs232 but this driver does not have this function. I also tried other driver but they does not work.

somebody give me a help.

thanks