python - PyVISA IV sweep with Keithley -


i'm trying iv curve measurement keithley , pyvisa. found matlab example on keithley website, there's 1 section not understand. 

% used serail poll function wait srq val = [1];          % 1st instrument in gpib object, not gpib add spoll(obj1,val);    % keep control until srq fprintf(obj1,':trac:data?')

what serial poll function do? , don't have spoll function in pyvisa, i?

serial polling implemented in higher-level drivers. repeated querying scpi *stb? or equivalent bus command.

pyvisa's read_stb(vi) calls visa's vireadstb(vi). can own polling.

edit:

read_stb pyvisa's low-level module. use low-level calls need pass vi field obtained instrument object.

there example here sure use appropriate scpi commands instrument , status model.

status polling depends on status , event registers being set before measurements start. can set instrument indicate samples available or measurement complete.

if bus gpib (ieee 488.2) pyvisa's wait_for_srq function work because, on gpib, srq 1 of bus signals. code shown in example.


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