I am using pythonnet version 2.5.2. Slide - your suggestion does fix the problem, thanks. The following code works:

from System import UInt32, Int32
from System import Double
result, response, errString = ESP301Device.SR_Get(Int32(1),Double(0.),"")

I think I misread the documentation, which says that calling dummy arguments was necessary with a void method. Is this correct? Otherwise the dummy arguments must always be provided? Thanks again to all for the feedback.

Matt
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