Andy Neil wrote:
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The OnRxChar Event could return any number of characters, but the LastErrors Method - as its name suggests - only tells me what the last error was; ie, I can't tell which of the received bytes had the 9th bit set (Parity error)."

Andy
Your on error event you get the Count which tells you the byte that had parity error, keep track of it and problem solved!
This way you can always extract the 9th bit.

mahmood