For devices to communicate from different VLANs, there needs to be a layer 3 device that facilitates the connection between VLANs/Subnets. It looks like the security gateway can perform this action.[URL] The X1052 has a Layer2+ mode that offers some routing features. Page 215: [URL] Once you have a device configured for routing, things should start communicating.    
I’m going to apologize for my lack of networking knowledge before I get started.  I feel like I know enough to be dangerous and have most my VLANs configured correctly but I know I’m missing some pieces.  I’m by no means am a network engineer but a volunteer that is trying to configure my churches network to be configured so security cameras and door access are on a separate network from our Wireless/LAN. My setup is shown at the bottom in a picture.    My problem is the following: When hardwired the switch and with a DHCP reservation to get on to the 10.75.x.x network I cannot talk to the door access controllers which are on that network.  So when I change to a static IP address on the machine I can access the door access controller but cannot get to the network.  Also, I would like to be able to get from the 10.10.x.x network over to the 10.75.x.x network but cannot seem to get this working.  I’m not entirely sure if I have my ports configured correctly going to the Unifi Security Gateway.  Right now I have the port set to Trunk with  the following settings: Switchport mode at Layer 2 VLAN List: 1,75, 192 Membership: Tagged Frame Type: Admit All Ingress Filtering: Enabled Native VLAN ID: 1   The network has been configured by a few other people before getting to me so that is why all the weird gateways/subnets.  I would consider redoing much of it but fear of breaking things and I have a full-time job and family on top of this volunteering.  Any help would be greatly appreciated!     [IMAGE]
Dell X1052P and Ubiquiti Security Gateway 4P