serial connection between 2 4.6.2 (not slip, dumb terminal)

Hi there.

I have two freebsd 4.6.2 boxes which I want to have hooked up in serial connection. I do not have local access to them, so I asked a friend on mine to buy null modem cable and connect them together. Note, I am not 100% sure he did it properly, so it might be a hardware problem.

I am trying to do something as simple as # tip com1 and # tip com2. It shows 'connected' and doesn't do anythign else. I have to do killall tip to get out of it. minicom just doesn't want to connect, neither with cuaa0 nor with cuaa1. Are there any low-level tools which can show if there's physical connection at all?

I've tried reading numorous howtos and faqs for connecting linux and openbsd, but couldn't find anything for freebsd. If anyone has any ideas at all, I would be very thankful because I don't have any experience with serial connections whatsoever. I am not even sure if you supposed to restart or change something in /etc/ttys or anything like that. Speaking of ttys, serial terminals are uncommented on both boxes (they were by default).

Ok, after reading 17.3 Terminals in freebsd handbook, I've edited /etc/ttys to have this
I suppose my connection is either com1 or com2 so I left d2 and d3 unmodified like this
but when I do # ps -axww|grep getty I get this for dx
I'm not sure what with ?? and tip and minicom still can't connect (minicom says offline and tip says connected but doesn't do anything)