Hi Frederic,
The only thing I can suggest would be to search on the internet and see if someone else has created a dll for this board. As this isn't our hardware, National Instruments wouldn't create a driver for it. The GfsDTAcq.dll was created by Data Translation so you could contact them and see if they plan on updating it to add support for the DT9834.
Sarah
Applications Engineer | National Instruments | UK & Ireland