Hi,
Recently, i have developed one product called, print to USB, means it can receive data from LPT Centronics printer port data on PCL format and can save it on disk.
As the same way, i can modify it by RS232 to get that data and send it over PC and save it as PDF.
What we have already developed is PC windows software, Driver, Circuit Layout, Firmware.
Let us know if interested.
Dhaval