[Elecraft] K3 band data lines

[Pierfrancesco Caci]

Hello,
I'm trying to make my own interface between the band data lines on the
accessory connector of the K3 and the remote antenna switch. 
I have a few questions that I hope you can help me with:

- is it safe to just poll the band lines with the arduino digital input
  pins? I understand that my K3 is new enough to have the internal pull
  up resistor. Should I put an isolation device inbetween? 

- does the band data as provided by the K3 always track the TX VFO?
  Should I expect some weird situation if I ever try to do cross-band
  split? 

- should I bother with asserting TX Inhibit and keep it set for a few
  milliseconds when I detect a band switch?

Thanks

Pf

-- 
Pierfrancesco Caci, ik5pvx