I have discovered that the early serial numbered models of the Yaesu FT-847 had unidirectional CAT. Basically, the software can send frequencies and modes to the rig, but the rig cannot respond. This applies to serial numbers through about 8GXXXX. Mine is an 8EXXXX series.
In any version of WSJT, under any operating system, the rig will set frequency and mode, then error out because it cannot respond to polling. I'm not sure if this needs fixed in WSJT or in hamlib, but other hamlib programs seem to work with the rig without issue.
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