The GSM Temperature Controller Alarm (Remote Terminal Unit) RTU5000 is a universal GSM Remote Control and Alarm Unit. it provides 2 Opt coupler (Iso) outputs, 4 Opt coupler (Iso) inputs, 1 of the 4 Opt coupler inputs can be used as counter function, 1 AD input(0-5V) can setup Higher and Lower Value to alarm, and RS232 Serial Port. It allows you to monitor and control an alarm or remote stations or equipments or machines by SMS.The GSM Temperature Controller Alarm (Remote Terminal Unit) RTU5000 is a universal GSM Remote Control and Alarm Unit. it provides 2 Opt coupler (Iso) outputs, 4 Opt coupler (Iso) inputs, 1 of the 4 Opt coupler inputs can be used as counter function, 1 AD input(0-5V) can setup Higher and Lower Value to alarm, and RS232 Serial Port. It allows you to monitor and control an alarm or remote stations or equipments or machines by SMS(Short Message Service) .TheApplications does the GSM Temperature Controller Alarm RTU5000 suitable for:1. Security Alarm System applications;2. Supervision and monitoring alarm systems3. Automatic monitoring system;4. Vending Machines;5. Pumping Stations;6. Buildings and Real Estate;7. Weather Stations;8. River Monitoring and Flood Control;9. Oil and gas pipelines;10. Corrosion protection11. Valve controls;12. Wellheads;13. Energy saving, street lights control system;14. Tanks, levels, temperatures, water leakage applications;15. Transformer stations;16. Unmanned machine rooms;17. Control room application;18. M2M;19. GSM Access Control System, GSM Gate Opener, etc.