The Sentinel Pro Monitoring System with Cellular Modem offers an easy-to-install, easy-to-configure monitoring solution for locations with no access to a landline or Internet connection. The system monitors, delivers alarms, and datalogs input/output points from third-party Modbus sensors, transducers and programmable logic controllers. The system supports Modbus RTU/485 and Modbus TCP. In addition, up to 12 digital or analog sensors can be added to the system. Users then program high and low limits and when those limits are exceeded, it instantly sends alerts via phone, text or email over AT&T's cellular network. It can also deliver daily event reports, and provide audit logs. Users can access information and make system changes from any web-enabled device. The system stores all readings in the cloud, which protects against data loss, provides unlimited information storage and allows multiple devices to be managed from one account. No software is required, so installation, integration and management are easy. This device includes a weather proof NEMA 4X rated enclosure with a solid door and shipped with a cellular modem equipped to communicate on AT&T's 4G network. A low cost cellular plan is purchased through the manufacturer and is required for use. Poll up to 64 Modbus registers from sensors, equipment or controllers Add up to twelve external sensors to monitor temperature, humidity, water, power failure and more. Also connects to any third party sensors that output a 4-20mA or dry contact signal. Program high and low limits on sensor data via beautifully designed website or mobile app. Receive alarms via email, text message or phone call when limits are exceeded. A supervised internet connection assures the Sentinel is online and monitoring at all times Unlimited datalogging capability on all sensor inputs