Test serial ports

Hi to all, I had Kannel working with my mobile phone till last night when my machine crashed because of power fail. I rebooted the machine and the filesystem was checked and corrected, but now when i start Kannel again, with the same configurations and with the same mobile phone it does not work. Apparently kannel can not comunicate with the mobile phone. How do i test my serial ports? How do i check if they are working ok ? Thanks to all in advance. Joao Reis