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Good day Murphy,
If you want to keep things simple only use the ST4 port, direct from guide camera to EQ6 mount.
The ST4 port signals are fed directly (controlled by PHD) to the RA/DEC motors.
If you guide via the DB9 ports (on the mount or through the handset) then there is a delay for the microprocessor (about 250mSec) in the mount to respond to the PHD command.
Disadvantage of the ST4 port is that it cannot do RA and DEC simultaneously must be one command followed by another, whereas EQASCOM through the DB9 port can do both at the same time.
With good polar alignment there shouldn’t be that many DEC commands issued anyway, so in practical terms it doesn’t matter.
Regards
Bill
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