Sentry 300 Circuit Control Board 500410 Vehicular Gate Operators Parts UL325
The Sentry control board is capable of operating two gates. If your installation is a single gate you can operate the gate on the Gate 1 or Gate 2 connector. Set control switch "ON" for the connector being used. The Sentry gate opener was shipped with the receiver and entrapment siren already connected to the control board; these connections are plugs that can easily be disconnected.