The distributed system integration Echo Contact Interfaces are available with 4-input, demand response or 4-output versions that provide simple and seamless integration with other control systems. The Echo Contact Input Interface (ECII) and Demand Response Interface (EDRI) accept wet or dry contacts and uses the closure to execute lighting actions in your Echo system. The Demand Response Interface allows a utility company to trigger a reduction of load within Echo Control System Spaces. The Echo Contact Output Interface (ECOI) provides triggers to control external devices. Additionally, the output interface can send Echo system control status updates/messages/information, enhancing communications with building management systems.