+ AA6YQ comments below
Great to find a box marked ARCO.
+ The OR2800 rotator controller does not use either the Hygain protocol or the Yaesu protocol.
...then stick the arco IP address in the tcp host address box ???+ When controlling an ARCO via TCP, you must specify both the Host Address and the Port in the ARCO panel on the Rotator tab of DXView's Configuration window.