I believe I now have the CFG, HDR, and Transmission Enable/Disable commands working with sensible data being returned (perhaps with a tweak or two to come). Now I’m sending Data Frames to the PMU Connection Tester over UDP to the tester’s UDP port number, but the tool does not seem to recognized the data.
Here is a Wireshark capture at the PC on which the PMU Connection Tester (PDC) is running:
Note the steady stream of Data Frames, ~10/sec, to UDP port 4712. Here is the test tool screen:
The tool obviously does not receive, or accept, the data frames that Wireshark indicates are present at the designated port number. I have run the data through my on-line CRC calculator and verified the Data Frames are correct. I believe 0xAA01 is the correct Sync value for Data. What am I missing? I assume this is user error again. 
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