I did some searching and came across a company that has existing code to help you with this project. They even have a toolkit for it for just $900 with demo and money-back gauarantee and a PDF about it and they have listed on their website that they do consulting work on this product:
http://willstein.com/Resources/ChromatographyToolkitManual.PDF
http://www.willstein.com/hardware-5890.html
Have you contacted them? Consulting charges may sound expensive, but your own time spent on this project could become more expensive.
Another low-cost solution that will still be a lot easier is using a package on the LabVIEW Tools Network to simplify the connection management, reading and writing data. You could treat it like Putty: http://sine.ni.com/nips/cds/view/p/lang/en/nid/214248
Certified LabVIEW Architect (CLA)
