The K3 can apparently be quite slow when switching bands and such.
I recently saw a 3.5 second timeout was not long enough.
So bump up your timeout value to 5000 and see if the problems disappear.
de Mike W9MDB

 

    On Friday, May 11, 2018, 9:26:12 AM CDT, Claude Frantz 
<claude.fra...@bayern-mail.de> wrote:  
 
 On 05/10/2018 10:21 PM, Sherman Banks wrote:

Hi Sherman & All,

> Trying to control a K3. The most common error is

> Hamlib error: Protocol error while opening connection to rig

> But I have seen one related to the VFO but that doesn’t happen as often.
> I have the Timeout at 3000 and polling at 5 seconds and it happens
> rarely now. Hopefully it will be rare during the next contest. I’m not
> sure it is timeout at this point since I have it so high by changing the
> value in hamlib_settings.json per

I ignore if this can help you a little bit, but here are the settings
used by fldigi, in the case of the K3:

  <TIMEOUT>50</TIMEOUT>
  <RETRIES>2</RETRIES>
  <WRITE_DELAY>5</WRITE_DELAY>
  <BAUDRATE>38400</BAUDRATE>
  <RTSCTS>false</RTSCTS>
  <ECHO>false</ECHO>
  <STOPBITS>1</STOPBITS>

Best wishes,
Claude (DJ0OT)

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