NI doesn't develop DTM for NI-FBUS products. There are 3rd party vendors in the market that offer FF Communication DTM for NI-FBUS interface devices. You may need to contact CodeWrights (http://www.codewrights.biz). CodeWrights developed DTM for NI PCMCIA-FBUS interface. But I don't know if they also offer DTM for USB-8486.