there are some microcontroller, usb2ttl or usb2rs232,,dont know if it will work if i wired those controller to the PBC...
i dont wanna keep the existing 232andAT wire..better replace them with USB wire directly soldered to the pbc thru some sort of controller...but dont know how to do.
those who sells the converters, shall build in certain controller in the converters which is the same idea i assume.