AppleTalk & self-assigned IP address using ethernet

How do I find or assign the IP address for my Ethernet 2 port?
I have two ethernet ports on my Mac Pro. The first one I'm using for the internet and is working fine. On the second one I've set up a local AppleTalk network to connect to my serial postscript laser printer through an iprint adapter.
The status is connected and I was able to print. But System Preferences has the message: "Ethernet 2 has a self-assigned IP address and may not be able to connect."
From reading these discussions a "self-assigned IP address" is a problem. Or is it okay? I'm using "Using DHCP" to configure because that option got me connected. Or should I manually configure? How do I find (or assign) the IP address? Obviously I don't understand much about networking.
Thanks!

Self-assigned addresses are not a problem in situations like you describe.
In fact that's what they're designed for - for interconnecting systems that just need to talk between themselves and not to other hosts on your local network or the Internet.

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