Supports RS232 serial interface usb 232,usb to serial interface,usb cable. 1)USB 1.1 and 2.0 compliant2)Supports RS232 serial interface(DB25 or ... OS 9.0, OSX and Linux6)Suitable for PDA and modem usb 232 / usb to serial interface Supports RS232 serial interfaceusb 232,usb to serial interface,usb cable.