If you can receive at the PC then the baud rate etc is probably ok, the other reason for the 085 can be your hardware handshake is not satisfied at the controller.
I personally prefer to use the Hardware handshake jumpered out, as the control uses software handshake.
This is 4-5, 6-8-20 jumpered on the control 25D plug.
No wires on these pins between CNC and PC ends.
If this does not work, you may have a faulty port IC.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.