Dear @Yan89 ，

Yan89 wrote

How to connect 2 devices tplink eap110 outdoor needed and connect to oc200 tplink hardware controller?

If you want to connect 2 EAP, you can use the Mesh function on the controller.

You may connect the OC200 to your router/switch, just need to make sure the EAP and controller in the same subnet.

Because this EAP supports mesh feature, to establish the mesh network, you will need to connect one EAP to the router/switch via Ethernet cable, and the other EAPs will be able to wirelessly connect to each other.
With the mesh network, you just need to power on the other EAPs, and they will not need to connect to the router/switch via Ethernet cable.

Please note that:
1) You will need to configure the Mesh network on the controller.

2) Here is a guide to set up mesh network: https://www.tp-link.com/support/faq/2949/

Best Regards!