Please make sure the FP-3000 is not working as LAS on the bus; and check the firmware revision of FP-3000 device. The latest firmware version is 2.3.6, which is available at ni.com/support/fbussupp.
If it still doesn't help, please try to connect the FP-3000 to NI interface card (PCI or PCMCIA) with running NI-FBUS Configurator. Right-click the FP-3000 device, double-click the "MIB" object, and change some network parameters as following:
T1 94200
T2 1920000
T3 1280000
And write changes, see whether it helps.