Hello,
You should adress your issue to the Network Group Support services at the link below:
* Network Group: Support Services Contacts
http://www.newport.com/servicesupport/template.aspx?id=205&lvlone=SiteNav&lvltwo=Services/Support&lvlthree=Support%20Services%20Contacts&lvlfour=〈=1
National Instruments does not know how the ESP300 driver and hardware work to be able to troubleshoot your issue. Network Group has developed a LabVIEW driver for their ESP300 controller, consequently, they have to support this driver.
Best regards.
Matthieu G.
National Instruments