The 5170 Transfer Switch Communication Module installs in ASCO Automatic Transfer Switches to provide a portal for monitoring and controlling critical power equipment. Transfer switches provide the ideal location for monitoring critical power systems. Situated between power sources and loads, they offer a pathway for collecting power data and controlling important backup power functions. By adding new digital IO to its existing Ethernet and RS485 capabilities, the 5170 Transfer Switch Communication Module connects, monitors, controls, and secures transfer switches in critical power systems. It unlocks critical power data and shares it with mobile electronics, dedicated annunciators, and sophisticated tools, such as the ASCO CPMS and popular building management systems. It enables remote testing of transfer switches and generators, sends real-time notices of power system events and alarms, and provides power information to webpages and monitoring systems.