Does anybody have a computer communications setup on this type, or similar mill?

In the patching cabinet on the back of the machine there's 1 RS232C port, but there's a cable in it that's wired in with a bunch of others and disappears into the machine. It does not look like a cable to be removed, unless it ends up in a RS232 contact elsewhere on the machine (I've looked and I can't find anything).

Below the RS232 there are two empty female 9-pin ports labeled RS449.

Any tips?

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