- The Big Picture
RLTK451 5-Port 4G Industrial Router
Rugged industrial router with multi-WAN & failover, full VPN suite (OpenVPN/IPsec/L2TP/GRE), and serial interfaces for secure PLC/HMI connectivity. Built for demanding sites, it adds an easy web UI, remote management and auditability for always-on operations.

Connectivity & Interfaces
Multi-WAN Ethernet with configurable LAN/WAN, optional Wi-Fi, and serial ports to fit diverse OT networks.

VPN & Security
OpenVPN, IPsec, L2TP and GRE tunnels with firewall/ACL and DoS protection keep access secure and compliant.

Industrial Design & Reliability
Fanless metal enclosure, wide-temperature operation and watchdog for reliable 24/7 service at the edge.
- Why RLTK451
Key Features
RLTK451 is built to keep industrial sites online and securely reachable. With multi-WAN Ethernet (seamless failover), full VPN suite, optional Wi-Fi, and RS-485/RS-232 bridging, you can connect to PLCs/HMIs in minutes—without a site visit.
- Multi-WAN & Failover — Keep sites online with health checks and auto-reconnect.
- Full VPN Suite — OpenVPN / IPsec / L2TP / GRE for secure, interoperable tunnels.
- Industrial-grade Ethernet — Configurable LAN/WAN; optional Wi-Fi for field access.
- Serial & Protocol Bridging — RS-485/RS-232 and Modbus RTU↔TCP for legacy assets.
- Rugged & Fanless — Metal enclosure, wide-temp operation, surge/ESD protection.
- Remote Management — Web/SSH/SNMP control, logging & alarms for fleet operations.
- overview
Technical Highlights
Compact, rugged industrial router with multi-WAN Ethernet (configurable LAN/WAN), optional 2.4 GHz Wi-Fi, and RS-485/RS-232 for secure PLC/HMI remote access and protocol bridging (e.g., Modbus RTU↔TCP). Built for industrial IoT, it provides seamless WAN failover with health-checks, plug-and-play setup via a simple web UI, and IT-grade controls—OpenVPN/IPsec/L2TP/GRE, firewall/ACL, NAT/port-forwarding, DHCP/VLAN, and logging/SNMP/SSH—while the fanless metal enclosure, wide-temperature rating, surge/ESD protection, and a hardware watchdog keep it reliable 24/7 in harsh sites.
- Why RLTK421
Ports & I/O
Snapshot of the physical interfaces on RLTK451.
- Ethernet: Multiple RJ45 ports — WAN (switchable) + LAN.
- Serial: RS-485 / RS-232 terminal; Modbus RTU↔TCP.
- Wi-Fi (optional): 2.4 GHz AP/Hotspot.
- Power: 9–36 V DC input; DIN-rail/panel mounting.
- Indicators: Power, link/activity, VPN/status LEDs; reset button.
- secure remote access
Connect It to RoltekConnect Cloud
Pair RLTK451 with RoltekConnect Cloud to onboard devices into a zero-trust tunnel. Apply role/time-based access, review session logs, and push configs/firmware remotely.
- Solutions
Use Cases

Remote PLC Maintenance
Monitor, troubleshoot and program PLCs/HMIs without a site visit—secure, auditable access via a zero-trust tunnel.

External Party Access Governance
RoltekConnect Cloud converts external parties access into a temporary, scoped, and fully auditable request → approve → operate flow, eliminating operational risk.

3. use case
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