Hi Casper,
The Eurotherm 900EPC is listed as Level 3 Obsolescence. NI is currently working with Eurotherm to provide LabVIEW drivers for newer controllers, like the 2000 and 3000 series. You might be able to use some VIs from the 2000 series certified driver:
http://sine.ni.com/apps/we/niid_web_display.download_page?p_id_guid=E3B19B3E971F659CE034080020E74861
Non-certified VIs for the 800 series can be found here:
http://sine.ni.com/apps/we/niid_web_display.download_page?p_id_guid=E3B19B3E90E4659CE034080020E74861
You will need to research the different command sets to determine if you will be able to reuse any of the VIs or if you will be able to easily modify them.
Other than that, here are a couple of pages on Eurotherm's site that might be helpful:
http://www.eurotherm.com/comms/instcom.htm
http://www.eurotherm.com/products/controllers/2400_doc.htm
I know this is not exactly what you are looking for, but I hope it helps.
Actually, I just searched Google and found the a set of drivers for the 900 EPC available for purchase:
http://www.vimarket.com/productpage.php3?product_id=110
Jason Hobbs
Instrument Drivers