Hello basti323,
on the 9188 is a reset button, push this for more then 10 seconds
after reseting the device, DHCP is activate and if no server is found
a link local address will be generated.
Check your network address from the pc, it should be a link local
like this 169.254.x.x and the subnet should be 255.255.0.0.
Under start write services.msc and in the services view disable
the windows firewall service.
Open the MAX press F5 and under devices-> network the
chassi should be shown.
If the device is found in MAX the firmware on the 9188.
Network cDAQ Troubleshooting Resources
Hoep this helps.
best regards
Alexander