In general - the connection from laptop/PC to the EQ6 mount is thru a USB/Serial TTL adaptor as these days most laptops/PCs have only USB ports
When I use my EQ6 Pro mount portable that's what I wire up - use StellariumScope in conjunction with Stellarium and indeed it works with ASCOM happily - now with the guider, because I use StarShoot Autoguider I can omit the cable that goes from the back of the guider to the mount since I can now use "pulse-guiding" which is via EQMod, also an ASCOM driven software - they all work happily together
In the past I did use the handset in lieu of the USB/Serial TTL adaptor to drive the mount and therefore had to set the handpiece into the "PC-Direct" mode under Utilities (button 3) using the supplied EQ6 cable that is used to update your handpiece
Since you're using a type of webcam I believe the GPUSB is required and in PHD you select the correct connection type as you've already discovered works
Others more knowledgeable will I'm sure chime in
YMMV
HTH
Cheers
Bill
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