Yes, I've done it.

I think your problem may be the noise output from the receiver?

The Rx gives a steady stream of noise and one has to use the SEROUT2 and SERIN2 commands with the WAIT modifier in SERIN2 (As described in page 138 of the PBP handbook.

This SERIN2 scans the stream of noise/signal out of the Rx until the transmitted "Start of Frame" characters arrive.

I know that this approach is rather primative but Iv'e got mine to work over a good range with zero errors - but I do live in the back of beyond in a very quiet electromagnetic environment.

If I'm on the right track I'll post my code?

Regards Bill Legge