Milesight UR32L-L0GEU 4G Router with 2 x Ethernet

Industrial 4G Router with Dual SIM and RS232 Serial

The Milesight UR32-L0GEU is an industrial 4G LTE Cat 4 router built for M2M and SCADA deployments that need reliable cellular backhaul and direct serial instrument integration without the overhead of PoE or Wi-Fi hardware. It carries dual SIM failover, an RS232 serial port with Modbus gateway support, galvanically isolated digital I/O, and a full VPN stack in a compact metal enclosure rated from -40 to +70°C. It mounts on a DIN rail or wall and accepts 9 to 48 V DC from industrial power supplies, UPS systems, or solar battery banks.

This is the straightforward configuration in the UR32 range. Without Wi-Fi, there is no wireless attack surface – an advantage on secure industrial sites and government installations. Power consumption sits at a typical 1.9 W, which matters on battery-backed or solar-powered remote sites where every watt counts. For sites that need PoE output, Wi-Fi access, or GPS, the UR32 range includes variants with those features. This model covers the core use case: a robust 4G connection, a serial port, and digital I/O, all managed remotely.

Key Features

• 4G LTE Cat 4 – 150 Mbps down / 50 Mbps up, with automatic 3G/2G fallback
• Dual Mini SIM (2FF) with automatic failover between carrier networks
• 2x RJ45 10/100 Mbps Ethernet – 1x WAN + 1x LAN, configurable as 2x LAN
• RS232 serial port – Modbus RTU/TCP gateway, transparent TCP, UDP, MQTT, and DLMS modes
• 1x digital input + 1x digital output, galvanic isolation – configurable via SMS, MQTT, and Modbus
• MicroSD slot for local data storage and event logging
• VPN – OpenVPN, IPsec, WireGuard, ZeroTier, GRE, L2TP, PPTP, DMVPN (spoke)
• Python SDK for custom edge application and automation development
• No Wi-Fi – reduced attack surface for secure and air-sensitive installations
• Typical 1.9 W power consumption, 9-48 V DC input, -40 to +70°C, DIN rail and wall mount

What the UR32-L0GEU is Used For

SCADA and Remote Telemetry

The UR32-L0GEU is a direct fit for SCADA deployments where the task is forwarding instrument data from a remote site to a central control system over 4G. Dual SIM failover keeps the connection up if one carrier drops. VPN on cellular – IPsec or WireGuard – provides the secure tunnel back to the SCADA head-end. The digital input monitors site alarms, door contacts, or float switches and triggers SMS or MQTT alerts on state change. A fixed IP SIM makes the site directly addressable for inbound polling from the control room.

RS232 Legacy Instrument Integration

A large installed base of flow meters, energy analysers, RTUs, and environmental sensors still communicates over RS232 with Modbus RTU. The UR32-L0GEU connects to these instruments directly and bridges the serial data over 4G to a cloud platform, historian, or SCADA system. The Modbus RTU-to-TCP gateway function handles the protocol conversion on the device, so no separate converter is needed in the panel. Supported output modes include MQTT, TCP client/server, UDP, and HTTP.

Remote Alarm and Digital I/O Monitoring

Sites with door contacts, PIR detectors, pump run signals, or pressure switches need a way to transmit state changes over cellular without complex software. The UR32-L0GEU’s digital input accepts a dry contact signal and can send an SMS, trigger an MQTT publish, or log the event locally to MicroSD when the state changes. The digital output can be switched remotely by SMS or MQTT command, covering remote relay control for pumps, valves, or indicator lights.

Secure Industrial and Utility Connectivity

On substations, water treatment facilities, and critical national infrastructure sites, Wi-Fi is often prohibited or undesirable. The UR32-L0GEU has no wireless radio beyond cellular, which removes the need for Wi-Fi access policies and simplifies the security audit. Authentication supports RADIUS, TACACS+, LDAP, and 802.1x. The firewall handles SPI, DoS/DDoS protection, IP filtering, and DMZ configuration from the web GUI or CLI.

Cost-Effective M2M and Asset Tracking Backhaul

For straightforward M2M deployments – vending machine telemetry, generator monitoring, tank level reporting, or remote digital signage – the UR32-L0GEU provides the cellular connection and management stack at the lowest cost point in the UR32 range. The Python SDK allows custom data handling logic to run on the router itself, reducing dependence on cloud processing for edge calculations. The Milesight Development Platform handles remote configuration and firmware updates across the fleet.

Frequently Asked Questions

Does the UR32-L0GEU have Wi-Fi?

No. This variant has no Wi-Fi radio. Cellular and Ethernet are the only WAN and LAN interfaces. This is intentional for deployments where wireless access is a security concern, a site policy restriction, or simply not required. If Wi-Fi is needed, the UR32-L00E-W and UR32-L0GEU-P-W-485 variants include 802.11b/g/n. See the comparison table below.

What is the RS232 port used for and what protocols does it support?

The RS232 port connects legacy serial instruments such as Modbus RTU devices, flow meters, energy analysers, and older RTUs. It supports Modbus RTU-to-TCP gateway mode, transparent TCP client/server, UDP server, MQTT client, and DLMS client modes. Baud rates from 300 bps to 230,400 bps are supported. If your equipment uses RS485 rather than RS232, the UR32-L0GEU-P-W-485 variant has an RS485 serial port.

What SIM card do I need for the UR32-L0GEU?

The UR32 takes a Mini SIM (2FF format) in both slots. For SCADA polling, VPN tunnelling, and inbound remote access, a fixed IP SIM card is strongly recommended. Standard SIM cards sit behind carrier-grade NAT, which prevents inbound connections from the control room. A fixed IP SIM assigns a routable public address to the router, making it directly addressable. See IoT SIM cards for the full range of options.

Can I manage multiple UR32 units remotely from one platform?

Yes. Milesight DeviceHub and the Milesight Development Platform provide centralised management, mass configuration, firmware updates, cellular diagnostics, and event alerting across deployed fleets. SNMP v1/v2c/v3, TR-069, and HTTP(S) API are available for integration with existing NMS tools. MilesightVPN can also create a private overlay network between units.

What VPN protocols does the UR32 support?

OpenVPN (client and server), IPsec (client and server), WireGuard, ZeroTier, GRE, L2TP, PPTP, and DMVPN spoke mode. For site-to-site SCADA connectivity and secure remote access over cellular, WireGuard and IPsec are the most common choices on this type of deployment. See our VPN on cellular routers guide for protocol comparisons and configuration guidance.

What is the operating power range and can it run from a battery or solar supply?

The UR32-L0GEU accepts 9 to 48 V DC. It draws a typical 1.9 W in normal operation, making it practical for solar and battery installations where power budgets are tight. Surge and reverse polarity protection are built in. The 2-pin terminal block connector suits direct wiring from a DIN rail power supply, UPS, or battery management unit without a dedicated PSU adaptor.

UR32 Variant Comparison

The UR32 range covers several hardware configurations. The table below shows the key feature differences. This page covers the UR32-L0GEU, the EU-band base variant with cellular, dual SIM, Ethernet, RS232 serial, and digital I/O.

Not sure which variant fits your deployment? Call UK-based technical support on 0300 124 6181 and we will advise on the right configuration.

Related Products and Further Reading

Browse all Milesight 4G routers including PoE, Wi-Fi, GPS, and RS485 variants of the UR32 range. For deployments requiring inbound access or SCADA polling, pair this router with a fixed IP SIM card. See IoT SIM cards for roaming and dynamic IP options. For remote device management across multiple sites, see the Milesight Development Platform. For VPN protocol guidance over cellular, see VPN on cellular routers. UK-based technical support on 0300 124 6181.