Hi,
the is Keysight P5002A is a Streamline USB VNA.
VNA Tools is not directly communicating with the VNA over USB. You need to run the Keysight Streamline USB Firmware on the PC where the USB VNA is connected to. VNA Tools will then communicate with the Keysight Streamline USB Firmware.
The resource name should look like that in VNA Tools:
TCPIP0::192.168.78.2::hislip0::INSTR
Replace the IP address by your address or localhost (if you run VNA Tools on the same PC as the firmware).
Regards
Michael