If using a NEB Port Expander, which contains the RS485 port it is currently not possible to adjust the baud rate setting on the RS485 port.
Whatever is selected in Project Designer, it always defaults to 9600 baud. We have reported it to our developers.
As a workaround, try to set the RS485 device to 9600 baud as well, so that they match.
NOTE: The RS232 port is working correctly and baud settings can be changed.