Lpc2000

> It is interrupt driven. If I look in the rxbuffer I can see all the "7F"s
> and I can see complete messages when using 2 stop bits on the PC.

The only other things I can think of is to check :

- That you're not set to 1.5 stop bits in UART.
- Check your GND on RS232, make sure it's not missing.
- Check that your RS232/logic levels are proper.

What do you mean with "all the 7F" RXd. Is that with 1 stop bit from PC ?
If so, what is it supposed to be receiving ?

7F is (in RX bit order)
0 - start bit
11111110 -7F
1 - stop bit

-- Kris