EG71 Milesight Industrial IoT Gateway

Overview

The EG71 is a building IoT gateway from Milesight. It connects field-level sensors and devices to cloud platforms or building management systems, handling the data flow between the two layers without extra hardware or complex setup.

Connectivity

The EG71 supports three backhaul options: Ethernet, 4G LTE cellular, and Wi-Fi. If one connection drops, the gateway switches to the next available path automatically. This keeps data flowing even in buildings with unreliable fixed-line connections.

For field devices, the EG71 connects via RS485, KNX, M-BUS (under development), LoRaWAN, and Ethernet. This covers the most common wiring standards found in commercial buildings, so existing installations can connect without rewiring.

Protocols

The EG71 reads data from field devices using Modbus RTU, BACnet MS/TP, and KNX – the protocols most HVAC controllers, metres, and sensors speak natively. It then forwards that data to BMS platforms or cloud systems using MQTT, HTTP, BACnet/IP, or Modbus TCP. No translation layer needed between the two sides.

LoRaWAN

The built-in LoRaWAN gateway supports up to 2,000 wireless end devices based on a 10-minute uplink interval. This makes it practical for large campuses or multi-floor buildings where running cables to every sensor is not cost-effective. NFC speeds up the process of adding Milesight LoRaWAN devices on site.

I/O Support

The EG71 has 8 universal inputs that each accept digital, analog (0-10V or 4-20mA), RTD, NTC, or resistance signals depending on what the connected sensor outputs. There are also 4 dry contact digital inputs for simple on/off signals, 3 relay outputs for switching loads, and 4 analog outputs for sending control signals back to HVAC or building equipment.

Security

The EG71 supports OpenVPN, IPsec, PPTP, L2TP, and WireGuard tunnels for encrypted remote access. Firewall options include access control, port mapping, MAC binding, and domain filtering – enough to meet standard IT security requirements in commercial buildings without additional appliances.

Development

Teams that need custom logic can run Python SDK scripts or Node-RED flows directly on the EG71. This allows local automation rules, custom data transforms, or integration with third-party platforms without sending everything to the cloud first. Remote management runs through the Milesight Development Platform.

Power

The EG71 accepts 24V DC/AC via terminal block, 802.3af PoE on the ETH1 port, or 5V via USB Type-C. The PoE option is useful in network cabinet installations where a separate power run is not available. Typical draw is 8.2W, with a maximum of 11.24W under load.