Saia PDC2.M480 disable/enable RS232 ports

[Dzon135]

Communication ports on PCD2.F522 and PCD2.F520 doesnt work, but other communication ports straight on board worked well. When I define the communication port (RS232) everything looks good (no error) also in debugging all rows are executed, but any communication goes out. When I use the some code for initialisation of communication port and send some communication it definitely works for communication ports straight on PCD board. I tried to change communication cards (F522 and F520) in next I also changed the PCD2.M480 board but both with the same result. So I thing there is some special system tag which can disable some communication ports. Or something else?
Please help me