Hello @johngj,Have you tried saving the "device_config.json" file using the latest Python GUI (the one within FP-SNS-DATALOG2 v2.2.0)?Best regards,Matteo

Hello @johngj,Looking at your screenshot, it seems that you are using an old GUI version (maybe the one within FP-SNS-DATALOG2 v2.1.1) with the latest version of the FW v2.2.0.To solve your issue, please update your installed version of the HSDPython...