freebsd 5.2 won't connect sco xenix 386

[ed]

Dear Fellows,
I need help to connect a freebsd 5.2 box to sco xenix 386 box via multiserial cable on the xenix box.
The xenix box allows a connection via a program called Easyterm.exe running on a windows 2000 box.
The xenix box has application which I like to connect to via freebsd 5.2 box. So
I built a null modem cable which I connected one end to the com1 (cuaa0) port on freebsd box and com2 line on the xenix box. Xenix box has multiserial card on it. So I used the line 2.
I used kde 3.2 xterminal window and run cu like "# cu -l cuaa0". I got a message saying "CONNECTED" but the login prompt from the xenix box does not appear on the monitor connected to the freebsd box.. Can anyone offer some suggestions on how to trouble shoot this problem? Or someone who has can across similar problem and find a way around?
Like to hear from you soon.
regards
ED