Industrial 4G-LTE VPN Router

Industrial 4G/LTE VPN Router with Serial Port

RLTK421 Industrial 4G/LTE VPN Router is a compact, robust and powerful device specially designed for industrial IoT applications. RLTK421 is equipped with 2x Ethernet (LAN / WAN) and WiFi with hotspot functionality. Multi VPN options like OpenVPN, IPsec, Firewall, Hotspot and remote connection. Provides secure and stable Internet connection for industrial applications.

4G/LTE Cellular

Best Industrial 4G/LTE VPN Router for high speed internet connection

Plug&Play Router

No settings are required for internet access.

Simple and Easy Installation

Long and complex installations are left behind. It is ready to use in a few minutes with its own built-in installation interface.

Easy Assembly and Installation

Compact size, supports both panel and DIN-rail mounting, suitable for various industrial IOT applications.

Custom Configuration interface

Linux based operating system with advanced features and development.

Shape Image
Shape Image

Robust and Powerful Industrial 4G/LTE VPN Router

The best choice for industrial environments, with excellent hardware designed for harsh conditions and the flexibility of the Linux Based custom operating system. ESD, Surge, EFT protection, wide input voltage. Built-in hardware watchdog, 7*24 hours stable operation in harsh environment or industrial site with strong electromagnetic interference.

  • IPsec VPN, PPTP, L2TP, OPEN VPN, GRE etc.
  • 2x Ethernet Port (LAN/WAN)
  • 1x SIM
  • WiFi
  • RS485 default, RS232
  • Hardware Watchdog
Best partners using RLTK421 Industrial 4G/LTE VPN Router
  • Saski
  • Saski

PLC Remote Access

PLC remote access with 4G Router in industrial equipment is an important part of industrial automation and efficiency. This technology provides fast and reliable access to critical equipment such as PLC and HMI from any geographical location. This allows operators to remotely monitor production processes, make adjustments and even quickly resolve problems. Thanks to this PLC remote access, maintenance processes are optimized, operating costs are reduced and uninterrupted operation of the systems is ensured. Additionally, emergency responses are carried out faster, reducing costs while increasing productivity. As a result, PLC remote access with 4G Router enables industrial facilities to operate more efficiently and reliably, providing a competitive advantage.

Multiple VPN Protocols

Supports IPsec VPN, PPTP,L 2TP, OPEN VPN, GRE etc. Ensuring Secure Data Transmission

Serial Modem

RLTK421 with routing and serial modem, which can easily achieve the bi-directional data transparent transmission between RS485 devices and 4G network, supports connecting to various cloud platforms.

High Speed 4G / LTE Connection

Minimize latency with a high-speed LTE connection.

Real Time Alarm

Supports email alarm and SMS alarm abnormal alarm push in time.

Wireless Access Point

Supports 2.4GHz Wifi and cover up to 100m. Create Hotspot points for devices or humans with the optional Wi-Fi feature.

Network Backup

Automatically reconnects when the connection is lost. It has 4G, 3G, 2G, WAN failover feature.

Cellular Interface Antenna 1 x SMA-KNote: North America models: 2 x SMA 4G antenna connectors.
SIM card 1 x (3 V & 1.8 V) Standard 2FF SIM, drawer-type sim card slots
Ethernet 1 x WAN port (can be configured to LAN) 10/100 Mbps, compliance with IEEE 802.3, supports auto MDI/MDIX,1.5KV network isolation transformer protection
1 x LAN port, 10/100 Mbps, compliance with IEEE 802.3, IEEE 802.3u standards, supports auto MDI/MDIX,1.5KV network isolation transformer protection
Indicators LED PWR: always on after powered on WLAN: always solid on when WiFi is enabled and working properly WAN: solid when cable is connected, blinking when data is transmitting and receiving LAN: solid when cable is connected, blinking when data is transmitting and receiving 2/3/4G mode indicator:2G led is on after connected to 2G network 3G led is on after connected to 3G network. Both leds is on after connected to 4G network. Signal strength:4 solid bars, strongest signal
WiFi Interface Standards & Frequency IEEE 802.11b/g/n,2.4GHz, AP mode
Data speed IEEE 802.11b/g,maximum 54Mbps.IEEE 802.11n, maximum 150Mbps
Antenna 1 x SMA-K
Transmission distance 80 meters by line of sight. Actual transmission distance depends on environment of the site.
Power Supply Adaptor DC 12V/1A
Connector DC Power Jack Barrel Type Female 5.5*2.1mm Round socket or 2 PIN 5.08mm industrial terminal block,reverse polarity protection
Input voltage DC 9~36V
Working power Average 270mA/12V
Serial Interface RS485/RS232(alternative) 3 PIN 3.81mm industrial terminal block. Note: RS485 default, RS232 please contact sales.
Baud rate(bps) 1200,2400,4800,9600,19200,38400,57600,115200,230400
Data bits 8
Stop bits 1,2
PhysicalCharacteristics Housing Metal shell, IP30
Dimensions 112.0*84.0*25.0 mm(L*W*H)
Installation method Panel mounting, DIN-Rail mounting
EMC Static IEC61000-4-2, level 2Pulsed Electric Field IEC61000-4-4, level 2Surge IEC61000-4-5, level 2
Operating temperature -20℃~+70℃
Storage temperature -40℃~+125℃
Operating humidity 5 5%~95%RH(non-condensing)
Others Reload Pinhole reset button
TBD Debug interface (TTL Level)
Embedded Watchdog Device runs self-detection, auto recovers from malfunctions
Certificate CE, FCC
NetworkConnection WAN protocol PPP, PPPoE, DHCP client
LAN protocol ARP, DHCP server, NAT
4G network access Auto APN/VPDN, private networkAccess authentication: CHAP/PAP
WLAN security Open system,WPA/WPA2 PSKTKIP/AES encryption
IP routing Static routing
Network diagnosis Ping, route trace, DNS
Serial modem Work mode NET,HTTPD
Sockets 4 sockets,4 centers, TCPS(SOCKA)/TCPC/UDPS/UDPC
Modbus RTU toTCP Support
Device management Configuration Web
Remote management Telnet, SSH, AT command, SNMP
FAST IoT Platform Remote monitoring, remote upgrade, alarming, base station location, remote access to web pages of the router
Security Failover backup Failover between 4G and WAN, ensures automatic switch to alternative backup connection
Firewall DMZ, anti-DoS, Filtering (IP/Domain name/MAC address), Port Mapping, Access Control
VPN Supports PPTP, L2TP, GRE, IPSEC VPN (IKEv1), OPEN VPN protocols
Service DDNS Remote access the device through domain name
Alarm Email, SMS Alarm
Others NTP clientTiming task
Region EMEA & Australia & Latin America & New Zealand
Frequency TDD-LTE B38/B40/B41
FDD-LTE B1/B3/B5/B7/B8/B20/B28
Serial modem B1/B5/B8
GSM/GPRS/EDGE 850/900/1800MHz

Everything We Do it With Love

Our main focus when creating products is centered around three core pillars: reliability, security, and user-friendliness. We firmly believe that these components are crucial for achieving success in any Internet of Things project.
150 +

Completed Projects

We have successfully completed more than 150 IoT projects.

2 k

Happy Client

More than two thousand people who use our products are happy.

95 %


95% satisfaction rate in our pre-sales and after-sales IoT services.

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Start Your Project with Us!

Whatever your goal or project size we will handel it utilize standards compliant. We hope you will be 100% satisfied.

"The process of creating an IoT device is complex, involving the integration of hardware and software. However, the results of this approach result in devices that are more secure, faster, and more user-friendly. Integrating hardware and software allows for better performance and easier maintenance of devices. Additionally, this approach enables IoT devices to be more scalable and developed more quickly. Ultimately, integrating hardware and software in IoT should be seen as an important way to create stronger and more efficient devices."

John R. Patrick


"The success of Internet of Things (IoT) devices relies on the integration of hardware and software. This approach enables devices to be faster, more secure, and more efficient. Additionally, the integration of hardware and software allows for easier management and better performance of IoT devices."

Ken Caviasca

VP of Intel IoT Solutions
John R. Patrick
Ken Caviasca

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