I require the design of a pcb that will connect to a usb port on a windows OS PC with the following functions on-board the pcb.
(1) usb audio input and output
(2) usb to serial conversion
(3) 2G byte onboard memory for local software file storage.
The usb to serial conversion must support industrial RS232 protocol and appear in Windows device manager as a new serial port.
The usb audio must allow mic/line input and audio line output and it must be seen as a new audio device in Windows manager.
The usb on-board memory must be presented as usb drive to ensure Windows OS detects it as a sperate usb device .