the receiver configuration is set as follows
COM [port] bps [parity[databits[stopbits[handshake[echo[break]]]]]]
parity N or E or O ?
handshake N or XON/XOFF ?
only the bps is configured in the QGC
Are you using pixhawk fc. Are you ising QGC to change parameters.
What is your receiver model
were you able to resolve this? If so, could you share how?