Instrument Control (GPIB, Serial, VISA, IVI)
Norma 4000 communication
The datasheet for the Fluke Norma 4000 only states that it has a Ethernet / 10 MBit/s or 100 Mbit/s interface. It says nothing about a VXI-11 or similar implementation on that port. There is no way to automatically detect a device on the Ethernet network if it doesn't implement some service announcement protocol such as Bonjour, LXI, HiSlip or VXI-11.
NI VISA can handle LXI, VXI-11 and HiSLIP (which is an extension of VXI-11). If your device does not implement that standard (properly) you will need to manually enter the IP address that the device got assigned with.
Your information is inconsistent. In your first message you say:
in NI MAX I cold not find any equipment.
now you say:
With NI MAX I was able to query the IDN to Norma4000 with LAN.
And finding equipment I interpret as enumerating the device automatically, which only works if the device implements one of the service announcement protocols.
Talking to the device by for instance doing an "*IDN?" query is a very different thing. Assuming you use the right resource name with correct IP address in viOpen() did you actually do a "*IDN?\r" (or maybe "*IDN?\n") in your C code? Since the communication is over TCP/IP, the device may require an actual termination character before it tries to parse the incoming command.
As to automatically enumerating your device, even if your device supports the VXI-11 protocol, that doesn't mean that NI VISA will be able to detect the device automatically. The NI-VISA driver itself doesn't implement automatic device enumeration, that's part of NI-MAX.
