hi. i have the same problem. zwo plus shows serial port. i tied several of buad rates.
9600 to 115000 .. but it fails.
there is nothing in the synscan manual about connections external?
i tried just skipping the alignment (2).. then set all the other parameters.
then i tired zwo to connect.. failed
i then put the DOB widi az/el mount in PC mode..
and tried to connect agaiin.. that failed. from zwo plus.
it could be the usb port does not turn on as control of the dob mount
until you actually do the 1,2,3 star alignment.. i will try faking the alignment
and then connect.
joe