When DHCP network configuration is Enabled, the gateway changes when connected to an ADv3 through a Y-Cable. If other applications or devices need to route to the AS-P through the Gateway, the change of gateway will break the connection.
EcoStruxure Building Operation
Advanced Display v3
AS-P overwrites its Default Gateway when connected to an ADv3
Update the Address Method to Static then enter the IP and Subnet address manually.