Industrial Cellular Router with RS485 & VPN, Dual Gigabit Ethernet

The VT-LTE500 Industrial Cellular Router features Dual-SIM 4G failover, 2x Gigabit Ethernet, and RS485/RS232 ports. It enables remote PLC access without public IPs via SDLAN/OpenVPN tunneling, and converts Modbus RTU/TCP to MQTT for direct SCADA integration.

Part No. VT-LTE500
sku : IoT-IR101
INSTANT QUOTE

Redundant Connectivity for Zero Downtime

Ensure your remote SCADA networks never go offline. The VT-LTE500 combines wired Ethernet networking with 4G LTE cellular backup.

  • Automated Failover: Active ICMP monitoring detects WAN drops and instantly switches traffic to the 4G network.
  • Self-Healing Links: Automatic network resets recover stalled connections without requiring field technician dispatch.
  • Local Wi-Fi Access: Built-in 2.4GHz Wi-Fi supports AP and Station modes for wireless sensor access and cable-free PLC debugging.
Dual SIM Industrial Cellular Router Link Failover Architecture

Secure PLC Access. No Public IPs Needed.

Bypass ISP restrictions and Carrier Grade NAT (CGNAT) entirely. The built-in SDLAN client establishes a secure, encrypted tunnel directly to your central control room.

  • Direct Tunneling: Remotely debug PLCs and HMIs exactly as if you were plugged into the local switch.
  • Enterprise VPNs: Natively supports OpenVPN, IPsec, and GRE for seamless corporate IT integration.
Secure Remote Access via SDLAN and OpenVPN Tunneling

Integrated Modbus to MQTT Gateway

Bridge the gap between legacy serial equipment and modern IoT platforms. The router directly accepts RS485 and RS232 connections from field meters.

  • Edge Polling: Functions as an active Modbus TCP/RTU master to aggregate field data.
  • Cloud Ready: Native MQTT publish and subscribe capabilities push organized telemetry straight to your cloud platform.
  • Centralized Cloud Management: Supports remote device management through a web-based IoT cloud platform for batch configuration.
RS485 and RS232 Industrial Router with Modbus MQTT Conversion

Ruggedized Hardware for the Edge

Built exclusively for harsh industrial deployments, ditching fragile consumer-grade plastics and cooling fans that act as points of failure.

  • Thermal Armor: Fanless, heavy-duty metal enclosure dissipates heat efficiently.
  • Cyber Defense: Protects your OT perimeter with Stateful Packet Inspection (SPI), DoS defense, and strict access controls.
VT-LTE500 DIN Rail Mounting and Physical Interfaces

Complete IIoT Architecture

Legacy PLCs & Meters
Via RS485/RS232
IP Cameras & HMIs
Via Gigabit Ethernet
Wireless Sensors
Via 2.4G Wi-Fi AP

VT-LTE500 Router
Edge Parsing & VPN Encryption

4G LTE Network
Smart Link Failover
Wired Broadband
Gigabit WAN Port

MQTT Platform
Data Aggregation
SDLAN / VPN Server
Remote PLC Access
Cloud Mgt Platform
Batch Configuration

Cellular & Network
LTE Modem4G (LTE)-Cat 4 (Downlink 150Mbps / Uplink 50Mbps). Dual Mini SIM-2FF slots.
Wi-Fi2.4GHz IEEE 802.11b/g/n, AP & Station modes, up to 50 users.
Hardware Interfaces
Ethernet1x WAN/LAN, 1x LAN (10/100/1000 Mbps RJ45).
Serial & I/O1x RS485, 1x RS232 (5-pin terminal block).
Software & Security
Industrial IoTModbus TCP/RTU master, MQTT Publish/Subscribe, JSON-RPC.
VPN & FirewallOpenVPN, IPsec (10 tunnels), GRE, L2TP, VXLAN, SDLAN. SPI Firewall, DDoS protection.
Mechanical & Environmental
Power Input9-36 VDC (Terminal/Jack), Anti-reverse protection.
Operating Temp & Dimensions-30°C ~ +75°C. IP30 Metal case, DIN-rail mounting. 84.81 x 65.09 x 32.70 mm.

Technical Documentation


VT-LTE500 Specifications Datasheet →


VT-LTE500 User Manual (Router Function) →

Will the router operate directly on standard 24VDC control cabinet power?
Yes. The VT-LTE500 supports a wide range of input voltage from 9-36 VDC. 5-pin terminal block included to wire directly to your existing 12V or 24V DC switching power supply inside the PLC control panel, no external step down converter required.
I need to install this inside a sealed steel enclosure. How do I get cellular reception?
The steel cabinets create a Faraday cage, stopping RF signals. The router comes with standard SMA female connectors for the antennas. For reliable 4G connectivity you will need to use external antennas with extension cables (such as magnetic mount or bulkhead antennas) and route them to the outside of your metal enclosure.
Does the package include the necessary DIN-rail mounting hardware?
Yes. The device comes with a standard 35mm DIN-rail mounting bracket, pre-attached to the back of the metal housing. It can be plugged into industrial racks right out of the box.
Can I configure a custom APN for my carrier’s private M2M cellular network?
Absolutely. The router’s web-based management UI allows you to manually input custom APN (Access Point Name), username, and password credentials. This ensures full compatibility with IoT/M2M SIM cards and private cellular networks provided by operators like AT&T, Verizon, or Vodafone.

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