Discover VISA devices

To discover GPIB/USB(/LXI?) devices run:

sudo python3
import pyvisa
rm=pyvisa.ResourceManager('@py')
rm.list_resources()  # example : ('ASRL/dev/ttyAMA0::INSTR', 'USB0::1689::1032::C023569::0::INSTR', 'USB0::1689::851::1525638::0::INSTR')
inst=rm.open_resource('USB0::1689::851::1525638::0::INSTR'')
inst.query('*IDN?')  # example : 'TEKTRONIX,AFG1022,1525638,SCPI:99.0 FV:V1.1.2\n'