Description
In the modern industrial landscape, control is not a luxury. It is the architecture of reliability — the invisible lattice that separates operational excellence from costly downtime.
The GP4-WLTE is engineered for a single purpose: to give you command over remote industrial assets as if you were standing in front of them. Whether it is a pump station three hundred kilometers away, a greenhouse environmental system running on solar, or a distributed water treatment network spanning an entire province — this controller collapses distance into a notification on your phone.
At its core, the GP4-WLTE integrates 4G LTE global cellular connectivity with a full industrial I/O suite: four 10-amp relay outputs for heavy-load switching, four 4-20mA analog inputs for precision sensor telemetry, and an RS485 Modbus interface for integration with your existing SCADA or PLC infrastructure. It speaks the universal language of industrial automation — and it speaks it over the air, anywhere on the planet where a cellular tower exists.
What makes the Grid Sentinel fundamentally different from consumer-grade IoT gadgets is its multi-channel redundancy. You are not limited to a single cloud platform. The GP4-WLTE communicates simultaneously via SMS commands, a dedicated mobile application, and a built-in web server accessible through any browser. If the cloud goes dark, SMS still works. If the cell tower is congested, the local web interface still responds. This is not a device that bets everything on one connection — it hedges across every available channel, because in industrial control, a single point of failure is not an edge case. It is an inevitability waiting to happen.
Core Capabilities
Works on GSM networks worldwide (USA, Canada, Mexico, Australia, NZ, Korea, Japan, Europe, Southeast Asia). Not region-locked.
10A rated relays for direct control of pumps, valves, motors, lights, and heavy industrial loads.
Connect industrial sensors — pressure, temperature, level, flow — for real-time telemetry and threshold-based alerts.
Integrate with existing PLC, SCADA, and industrial automation systems over industry-standard Modbus RTU protocol.
SMS commands + mobile app + built-in web server. Three independent control paths — no single point of failure.
Compliant with European safety and EMC standards. Ready for deployment in regulated industrial environments.
Application Scenarios
| Remote Pump Control | Water treatment, irrigation, and oil/gas pump stations — switch on/off via SMS or app from anywhere |
| Greenhouse Automation | Monitor temperature/humidity via 4-20mA sensors, trigger ventilation and irrigation relays based on thresholds |
| Distributed SCADA | RS485 Modbus integration bridges legacy industrial equipment to modern cellular IoT infrastructure |
| Smart Grid / Energy | Monitor and switch solar inverters, battery banks, and grid-tie relays with programmable logic |
| Security & Access | Remote gate/barrier control with sensor feedback — industrial-grade access management over cellular |
Frequently Asked Questions
Q: Will this work in my country?
The GP4-WLTE-GA variant supports global GSM/LTE bands including USA (AT&T, T-Mobile), Canada, Mexico, Australia, New Zealand, Korea, Japan, and most European and Southeast Asian countries. Verify local 4G band compatibility with your carrier.
Q: Can I control it entirely via SMS without internet?
Yes. SMS commands are a first-class control channel. You can query status, toggle relays, and receive threshold alerts entirely through text messages — no data plan, no app, no cloud dependency required.
Q: How do the 4-20mA analog inputs work?
Each of the four channels accepts industry-standard 4-20mA current loop signals from sensors (pressure transducers, temperature probes, level sensors). Configure high/low alarm thresholds in the app and receive SMS alerts when readings exceed your set limits.
Q: Is there an API for custom integration?
The built-in web server provides HTTP endpoints for relay control and status queries. RS485 Modbus RTU enables direct PLC/SCADA integration. Contact us for API documentation and integration guidance.
Q: What power supply does it require?
The GP4-WLTE operates on 12-24V DC power. Typical power consumption is under 3W in active mode, making it suitable for solar-powered remote installations.
Technical Specifications
| Model | GP4-WLTE (4G Global Version) |
| Cellular | 4G LTE GSM (Global Bands) + 2G Fallback |
| Relay Outputs | 4 Channels, 10A @ 250VAC / 30VDC |
| Analog Inputs | 4 Channels, 4-20mA Current Loop |
| Serial Interface | RS485 Modbus RTU |
| Control Channels | SMS, Mobile App (Android/iOS), Built-in Web Server |
| Power Supply | 12-24V DC |
| Certification | CE |











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