Robustel R1511-4L-A05NA-B Dual Ethernet 4G LTE Router



RS485 Port

FCC/PTCRB/IC Certified 

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R1511 Dual Ethernet Router (mod. R1511-4L A05NA-B)

R1511 Lite-Industrial Dual Ethernet IoT Router.

The R1511 is a sister product of the R1510 series offering a choice of (3-wire) RS232 or (2-wire) RS485 instead of the Digital Input and Digital Output found on R1510 series.

This means that RS232 and RS485 devices, including Modbus RTU equipment can connect to the internet directly through the R1511 router. The Ethernet port can be independently configured as WAN, LAN1 or LAN2 and Ethernet port 1 as LAN1 or LAN2.


  • Dual Ethernet and choice of RS232 or RS485 port
  • Modbus RTU to Modbus TCP Gateway built-in
  • Ethernet, Wi-Fi and 4G internet connection options with auto-failover
  • Free cloud management platform – RCMS
  • Fully programmable Linux environment with excellent SDK Documentation
  • ‘Smart Reboot’ for enhanced roaming SIM management
  • RobustVPN provides fixed IP address on ANY SIM card
  • Full SMS control for diagnosis and recovery from data network problems
  • Very small footprint for space-constrained applications
  • Wall-mount and DIN-rail mounting options available

What's in the box:

  • R1511 Router
  • Power Supply 100-240Vac, 1.0Amp with US/CDN plug
  • Terminal block
  • 2x Cellular 4G Rubber Rod Antenna
  • 1x Wi-Fi Rubber Rod Antenna

Cellular Interface
Number of antennas2 external antenna(MAIN + AUX)
SIM1* (3 V & 1.8 V) Standard SIM or eSIM
Ethernet Interface
Number of ports2 x 10/100 Mbps, 2 x LAN or 1 x LAN + 1 x WAN
Magnet isolation protection1.5 KV
Wi-Fi Interface
Number of antennas2 (1 external antenna, 1 PCB antenna)
ConnectorRP-SMA-K (external antenna)
Standards802.11b/g/n, supports AP and Client modes
Frequency bands2.4 GHz
SecurityWEP, WPA, WPA2
Encryption64/128 AES, TKIP
Data speed2*2 MIMO, 300 Mbps
RF output power

(+/-1 dBm)



802.11b                           19 dBm
802.11g                           19 dBm
802.11n (20 MHz)        18 dBm
802.11n (40 MHz)        17 dBm
Receiving sensitivity

(+/-1 dBm)




802.11b                           -93 dBm
802.11g                           -90 dBm
802.11n (20 MHz)        -88 dBm
802.11n (40 MHz)        -85 dBm
Serial Interface
Type1 x RS-232 or 1 x RS-485 (Hardware configuration)
Connector3-pin 3.5 mm female socket
Baud rate300bps to 115200bps
Reset button1 x RST
LED indicators


1 x RUN, 1 x MDM, 1 x USR, 1 x RSSI, 1 x WLAN
Built-inWatchdog, Timer
Supported programming languagesC, C++, Linux Shell scripts
Flash available for SDK4MB
RAM available for SDK64MB


Software (Basic features of RobustOS)
Network protocolsPPPoE, DHCP , NAT, DNS, NTP, SMTP, Telnet, VLAN,VLAN, VLAN, SSH2, DDNS, etc.
VPN tunnelIPsec, OpenVPN, GRE
FirewallDMZ, anti-DoS, Filtering (IP/Domain name/MAC address), Port Mapping, Access Control
ManagementWeb, CLI, SMS
App Center (Available Apps for RobustOS) 
Apps*L2TP, PPTP, DMVPN, VRRP, QoS, Captive Portal, WLAN Multi AP, SNMP, Language, RCMS
*Request on demand. For more Apps please visit
Power Supply and Consumption 
Connector2-pin 3.5 mm female socket 
Input voltage9 to 36V DC 
Power consumptionIdle: 100 mA@12 V

Data link: 500 mA (peak) @12 V

Physical Characteristics 
Ingress protectionIP30 
Housing & WeightPlastic, 150 g 
Dimensions91.5 x 91.5 x 31.5 mm 
InstallationsDesktop, wall mounting and 35 mm DIN rail mounting 
Operating Temperature-25 to +70 °C 
Storage Temperature-40 to +85 °C 
Relative Humidity5 to 95% RH 
EMIEN 55032: 2012/AC: 2013 (CE & RE) Class B 
EMSIEC 61000-4-2 (ESD) Contact Level 2;

IEC 61000-4-3 (RS) Level 2

IEC 61000-4-4 (EFT) Level 2

IEC 61000-4-5 (Surge) Level 2

IEC 61000-4-6 (CS) Level 2

*(In progress)  
*See ordering information for details about other certifications

ModelPNSerial InterfaceLTE CategoryFrequency Bands*Region/



(* In progress)

R1511-4L-A02EU-AB061701RS232CAT4LTE FDD:


R1511-4L-A03AU-AB061703RS232CAT4LTE FDD: B1/B2/B3/B4/B5/B7/B8/B28


WCDMA: B1/B2/B5/B8GSM: B2/B3/B5/B8Australia/

New Zealand

R1511-4L-A07CN-AB061705RS232CAT4LTE FDD: B1/B3/B5/B8

LTE TDD: B34/B38/B39/B40/B41

WCDMA: B1/B8GSM: B3/B8China/India 
R1511-4E-A10CN-AB061707RS232CAT1LTE FDD: B1/B3/B5/B8

LTE TDD: B34/B38/B39/B40/B41

 GSM: B3/B8China 
R1511-4L-A05NA-AB061709RS232CAT4LTE FDD:


WCDMA: B2/B4/B5 North AmericaFCC*, Ic*, PTCRB*, ATT*, Verizon*
R1511-4L-A04JP-AB061711RS232CAT4LTE FDD: B1/B3/B8/B18/B19/B26


WCDMA: B1/B6/B8/B19 JapanTELEC*, JATE*

* Please contact your sales representative for more detailed information on model numbers and for availability of “Global” routers.


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Robustel R1511-4L-A05NA-B Dual Ethernet 4G LTE Router

Robustel R1511-4L-A05NA-B Dual Ethernet 4G LTE Router

RS485 Port

FCC/PTCRB/IC Certified 

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