Query unterminated, along with Query interrupted, indicate a problem with either the string you are sending (syntax), or with timing. Since you have this working with NI-MAX make sure the strings in your program match those you used in NI-MAX. If that's not the problem, try putting delays in the program. That is, send a string, wait 10 milliseconds, get the response, wait 10 milliseconds. (There are some instruments that have problems with fast computers. They were designed in the days when the computer couldn't possibly get back to the instrument in 10 ms. Now that they do, the parser gets confused.)
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