Thanks for the replies so far

Yes the data is 100% correct and is not corrupt.

I've tried sending the data by sending 1 byte then changing parity then sending the next but framing errors occur as you predicted

I have an application where I need to implement 9 bit serial, The device I'm trying to talk to uses 8 bit data with constantly changing parity as a method data validation. I was looking at bit-banging but would rather hardware if possible due to more reliable comms. I've attached an example of the s...