Overview
GSM-SMS Controller is a remote-control unit for heating systems, gates, and other premises that must be commanded over the cellular network. Operator sends an SMS from any registered SIM; the controller parses the command text and switches one or all three of its 2 kW low-voltage relays. State is remembered across mains failure on a battery-backed RTC; backup power keeps the unit reachable during a mains outage so the operator still gets fault alerts. Operating range covers outdoor cabinets from -40 to +80 °C.
Key features
- Send SMS to switch any of three relays or reboot a device
- Command parser accepts custom text per relay
- Mains-fail state remembered (relays return to last commanded state on power restore)
- Backup power keeps the unit reachable during a grid outage
- External SIM slot for operator-chosen carrier
- Wide -40 to +80 °C range for outdoor enclosures