I'm a little confused but the way I read your message would suggest that you're going to connect your PIC to the PC with an FTDI USB to serial device? Or have I misunderstood and you're hoping to connect the PIC to the FTDI with USB? On 14 Nov 2017 12:25, "Richard Pope" wrote: HELLO ALL, .. . . . I could really use some help with using USB on the PIC 18F4520. I am going to use a FTDI USB to RS232 converter to talk to the PIC 18F4520 Through the RX and TX Pins. I want to send Configuration Code to a 24C512 serial EPROM. When I add additional devices I want to be able to update the EPROM. I also want to be able to use a Win 8.1 64bit Pro PC to control the Programmer. I also do a lot of searching and research on materials that I acquire from the MicroChip website. I have been reading the MC USB Device Firmware Framework User's Guide. . . . . I have the latest version of MpLab, and the latest versions of the X8, X18, and X32 Compilers installed. I also see that I need to install the latest versions of C30 C and C18 C Compilers and setup the proper Paths for these files. I don't mind doing the footwork. I am Disabled and retired. This gives me a lot of free time. Thanks, Richard R. Pope 1230 19th Street #5 Reedsburg, WI 53959, USA 1-608-768-7448 mechanic_2@charter.net --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .