You are getting that message because the instrument does not support the *IDN? query. The message is normal for old instruments and can be ignored. If you want to use MAX to communicate, use the "ID?" (no quotes) query. There is a LabVIEW driver for it
here. You should have been able to find the driver yourself if you had gone to the
Instrument Driver Network or used the Tools>Instrumentation>Find Instrument Drivers option in LabVIEW 8.x.