unable to communicate with device about qcsapphire HOT 4 OPEN

Hi @palnitishh. What is the output of

import qcsapphire
qcsapphire.discover_devices()

Actually, @palnitishh -- can you move this to a new issue?

And can you tell me details of the device you're using? Based on the error message, It looks like the *IDN command didn't work and the returned value from the device is an empty string.

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From @palnitishh

Hi @gadamc
thank you for your reply here is the screenshot.
COM4 is connected to Quantum Composer.

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From @palnitishh

the QC terminal is able to do *IDN command

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@palnitishh -- I'm not 100% sure, but the output from the QC terminal seems to suggest that your device is QC 9528. https://www.quantumcomposers.com/pulse-delay-generator-9520. This python package (qt3uw/qcsapphire) was only ever tested with QC 9200 devices. A quick review of the manual for the 9520 and the 9200 reveals some differences in USB communication. The 9520 uses USB 1 specs and the 9200 uses USB 2 specs. Relatedly, they use different default BAUD rates.
If you manage to find a way to update this package to support the 9520, let me know and perhaps a PR makes sense if it's not too much of a change and there don't seem to be any side effects.

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