Robustel R1520 is a versatile 4G router designed for demanding environments, featuring 5 Ethernet ports, GPS, and E-mark certification for in-vehicle use. It includes optically isolated digital I/O, a 10-bit analog input for sensors, and a 2-wire RS485 interface with Modbus support. The RS232 port offers RTS/CTS lines for hardware handshaking. Despite its cost-effectiveness, the R1520 delivers high packet-forwarding performance and runs on RobustOS, a Linux-based operating system developed in-house for enhanced technical support and stability. Unique software features include RobustVPN, which provides a flexible hosted VPN service for a “fixed IP router” experience.
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Cellular Interface |
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Number of antennas |
2 |
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Connector |
SMA-K |
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SIM |
2 Mini SIM (2 FF) |
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Ethernet Interface |
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Number of ports |
5 x 10/100 Mbps, 5 LAN by default, can be configured as 1 WAN + 4 LAN |
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WAN port |
Support 802.3 af & 802.3at PD feature on ETH0 |
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Magnet isolation protection |
1.5 KV |
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WiFi Interface |
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Number of antennas |
2 |
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Connector |
RP-SMA-K |
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Standards |
802.11 b/g/n, supports AP and Client modes |
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Frequency bands |
2.4 GHz |
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Security |
WEP, WPA, WPA2, WPA3 |
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Encryption |
64/128 AES, TKIP |
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DI/DO |
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Type |
1 x DI + 1 x DO, wet contact |
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Isolation |
3 KV |
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Socket form |
2 * 3-pin 3.5 mm female socket |
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Level |
3 to 30V DC = HIGH, 0 to 1 Vdc = LOW |
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Absolute maximum VDC |
30V DC（DI/DO） |
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Absolute maximum ADC |
10mA（DI/DO） |
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Analogue Input |
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Type |
1 X AI (can be configured as voltage type or current type) |
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Voltage input range |
0 to 24 Vdc |
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Current input range |
4-20 mA (current-type input requires external resistance, and finally measured by voltage) |
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Socket form |
2 * 3-pin 3.5 mm female socket |
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Signal definition |
AI，AGND |
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Serial Port |
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Type |
1 x RS232 + 1 x RS485 |
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Socket form |
2 x 4-pin 3.5 mm female socket |
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Signal definitions |
RS232: RXD, TXD, SGND, RTS, CTS RS485: Data+ (A), Data- (B), GND |
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Other Interfaces |
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1 x GPS interface (Optional, depending on the cellular module) |
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1 x 480Mbps high-speed USB2.0 interface(Type A, 5V, 500mA) |
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Others |
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Reset button |
1 x RST |
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RTC |
External RTC clock , Backup energy storage capacitor can be maintained for 2 days |
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LED indicators |
1 x RUN, 1 x MDM, 1 x USR, 1 x RSSI, 1 x WiFi |
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Watchdog |
Built-in |
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Software (Basic features of RobustOS) |
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Network protocols |
PPPoE, TCP, UDP, DHCP, NAT, DNS, NTP, SMTP, Telnet, VLAN, SSH2, DDNS, etc. |
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VPN tunnel |
IPsec, OpenVPN, GRE, WireGuard |
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Firewall |
DMZ, anti-DDoS, Filtering (IP/Domain name/MAC address), Port Mapping, Access Control |
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Remote Management |
Web, CLI, SMS |
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App Center (Available Apps for RobustOS) |
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Apps* |
L2TP, PPTP, DMVPN, VRRP, QoS, Captive Protal, WLAN Multi AP, SNMP, Language, RCMS |
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SDK |
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Supported programming language |
C, C++ |
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Flash available for SDK |
4 MB |
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RAM available for SDK |
64 MB |
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Power Supply and Consumption |
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Connector |
2 pin 3.5 mm socket with lock |
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Input Voltage |
9 ~ 36 VDC |
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PoE-PD Voltage |
Possibility to power up through ETH0 40 ~ 57 VDC |
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Power consumption |
Idle: 250 mA@12 V Data link: 890 mA (peak) @12 V |
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Physical Characteristics |
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Ingress protection |
IP30 |
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Housing & Weight |
Plastic, 250 g |
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Dimensions |
105 x 90 x 46 mm |
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Installations |
Desktop, wall mounting and 35 mm DIN rail mounting |
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Operating temperature |
-25 ~ +70 °C |
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Storage temperature |
-40 ~ +85 °C |
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Relative humidity |
5 ~ 95% RH |
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Regulatory and Type Approvals |
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Environmental |
RoHS2.0, WEEE |
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EMI |
EN 55032 Conducted Emission Class B EN 55032 Radiated Emission Class B |
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EMS |
EN 61000-4-2 (ESD) Contact Level 2, Air Level 3 |
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EN 61000-4-3 (RS) Level 2 |
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EN 61000-4-4 (EFT) Level 2 |
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EN 61000-4-5 (Surge) Level 3 |
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EN 61000-4-6 (CS) Level 2 |
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EN 61000-4-11 (DIP) Level 2 |
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