Reading directly from PCo?

This is a pretty basic question, and hopefully it has a simple answer:

How can I read values out of PCo using something other than MII?

I am wanting to know so that I can troubleshoot possible PCo problems better in the future. We had some apparent PCo problems recently, and I didn't know how to identify whether they were truly problems with PCo or with something else, e.g., MII's PCoConnector settings.

We have:
MII 12.2.4 Build(92) on a Linux server
which connects to
PCo 2.2 (2.203.1195.1058 Patch level 32808) on a Windows 2008 server
which connects to
FactoryTalk Gateway, an OPC DA server (OPC-DA 2.05a) running on the same Windows 2008 server