[Elecraft] K3 UART communication with LabView

[Russ]

I am trying to understand the SET/GET protocol to serially communicate with the K3.
I am experimenting with "FA;" which will retrieve the VFO A frequency. After I send the command, I get back responses three bytes at a time which I accumulate in a ring buffer until the response is complete.  Sometimes I get the correct frequency in the response, sometimes only an "FA".  Manual frequency change from the K3's front panel does not seem to be acknowledged.  FA followed by the frequency does effect a frequency change.

Is there a use group dedicated to UART K3 control?

Thanks, Russ KD4JO