Driver of USB-RS232

I got a equipment which has a USB-2-RS232 converter. USB port for connecting to the PC, but the equipment is a standard RS232 device.
So I need to write a driver for the USB-RS232? is it possiable to do this?
is there anyone did this before?how to begin with it?
somebody told me that use “devc-serusb”, how to use it please?
Thank you very much!!

Hello Snowingfish,
Please check: … erusb.html

thanks a lot, Yuriy!! So it’s means I must use QNX6.4.0 to do it?