> Yes, I've been reading the FTDI docs. NICE chips. Should make one
> version of the conversion dead easy, except that I don't have
> RS232 levels since I'm just driving opto isolators which effectively
> do the level shifting for me.  Hopefully a couple of CMOS inverters
> with clamp diodes will be sufficient. But then I'm back to the
> opto isolation problem until the RF side is done.

Huh ?  You dont need RS232 levels to drive the USB chip.  You can drive it
directly from the USART RX/TX pins on the PIC.  Of course when I say
*directly*, there are a couple of resistors and caps involved, and you need
a 6MHz oscillator source for the USB chip, but that is all.

I suggest you read the FTDI docs further.  You only need an RS232 driver for
a USB to Serial converter.  If you are communicating USART directly from the
PIC to a PC (or other device), you only need the USB chip.

If you need a working circuit for PC<->FT232BM<->PIC serial communications,
I suggest looking at the DIY USB PIC programmer.

Heres a link for you...
http://electronickits.com/kit/complete/prog/ck1708.pdf

Rgs
Ian

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