Dave

I have made all your suggested changes.
I don't receive anything on the PC side, but for a test I have moved the RS232 to the transmitter. (Disconnected the TXD Pin and put the RS232 in its place)
Then I receive the following characters.

ננננננננננננננננננננננננננננננננננננננננננננננננננ ננננננננננננננננננננננננננננננ
ננננננננננננננננננננננננננננננננננננננננננננננננננ ננ