Ok I need help understanding how to access my switch from admin Vlan.  My setup consist of 3 Switches 

Main switch 1.xxx 2nd switch 1.xxx and 3rd switch 1.xxx. As long as I am on that subnet all is well for GUI access. When I leave and go to another building 200 yards away. My only access is Vlan 200.xxx which is Admin only Wifi. I need to have access to these switches. I can access small TP link TL-SG108E smart switch with No issues. It seems to be a security related on the layer3 switches. What am I missing here

Any Help would greatly appreciated

Big_12ms