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Cellular Modem Routers USR-G781


1 in stock (can be backordered)

Cellular Modem Routers | Industrial Cellular Modems


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Cellular Modem Routers USR-G781 Introduction

Cellular Modem Routers USR-G781 is an industrial cellular modem router, which provides a serial to cellular networking solution. Provide Serial and Ethernet Connectivity to PLC, RTU, Data Loggers, Wireless SCADA applications and IP Cameras at Remote Sites.

Features of Cellular Modem Routers USR-G781

  • Supports 2 10/100Base-T(X) self-adaptive Ethernet interface and 1RS485 port.
  • Hardware watchdog ,rugged metal casing and wall mounting.
  • 2 RJ45 port, one can be WAN or LAN port and another one can be LAN port.
  • Support VPN(PPTP) client.
  • Support static routing.

Basic Functions

  • Serial Modem
    • G781 integrates with routing and serial modem, which can easily achieve the bi-directional data transparent transmission between  S485/RS232 devices and 4G network, supports connecting to various cloud platforms.
    • It also supports user-defined register & heartbeat packets to ensure the device online.
  • Transparent Transmission
    • Provide data two-way transparent transmission between field serial devices and the central control server Support 4 Socket connections, support TCP Client and UDP Support custom heartbeat package and registration package.
    • Private protocols can be customized.
  • httpd Client
    • submit serial data to the designated server by HTTP (GET/POST) method.
  • Modbus RTU to TCP
    • Modbus RTU/Modbus TCP protocol conversion for industrial SCADA systems and field devices.


  • Video Surveillance
    • Through 4G networking, it provides high-speed network access for cameras, and other devices that require large data transmission, so that staff can remotely monitor the details of the field.
  • Electric Fire Monitor System
    • Based on modern IT like the IOT sensor, cloud computing and big data, the electrical safety supervision service system consists of intelligent sensor terminal, wireless transmission devices and supervision platform. The intelligent sensor terminal monitors the electric status(wire temperature, currency, after-current and fault arc) and transmits the data to the supervision platform through wireless communication.
SKU: Routers USR-G781-E Categories: , ,
Parameter Item Index
SIM card and antenna SIM/USIM card Six pin SIM card interface, 3V/1.8V SIM card
Antenna SMA interface, 5 dBi antenna
Hardware Parameters Wired Internet interface WAN*1 and LAN*1
Data Interface RS232:300bps – 460800bps
RS485:300bps – 460800bps
Working Voltage DC 9V~36V
Working Current
Average current 180mA@12V
Peak Current 300mA@12V
Working Temp. -35°C-75°C
Storage Temp. -40°C-125°C
Working humidity 10%~90%
Storage humidity 5%~90%
Software Parameters Work Mode Transparent Mode, httpsD Client Mode
Setting Command AT+ Command Structure
Network protocol TCP/UDPDNS/https/FTP
Max TCP connections 4
User Configuration Method Setting Software, AT command and Web Server configuration
Software Functions VPN Support PPTP
Static routing management Support
Firewall Support
Network diagnosis Support
Remote Management Support
Transparent Transmission Support TCP Server/TCP Client/UDP Server/UDP Client
https Protocol
Heartbeat Packet Support
Identity Packet Support IMEI/ICCID/self-defined identity packet
Baud Rate Synchronization Support
USR Cloud Support

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