I'm not familiar with this LXI chassis.
The only PXI (as opposed to PXIe) DMM being sold is the PXI-4065.
For it to work, the 4065 would need to be on the PCI/PXI bus of whatever computer resides on the LXI chassis and you'd need to install the NI-DMM driver on this computer, assuming it runs a supported OS. Then you'd need to write your own software that makes the instrument available over ethernet to perform whatever it is it needs to do, which I assume on a TCP/IP network. Python can be a really good tool to do this.
Is there such a computer running the LXI chassis? What are its specs? What OS does it run? Is the ethernet connector a TCP/IP network?
I hope this is helpful.
Chief Software Engineer
NI Driver Software