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Industrial 4G LTE Modem Router, Serial to Cellular Modem USR-G781-AU

  • $259.00
  • Save $40
  • (Exc. GST)

  • Available in stock

  • $ We Ship from our stock in AU (Perth) with pickup option, and Prices are Exc. GST
  • $ We Offer Quantity Discounts for Large Orders 10+ qty (Request for Quote)
  • $ We Accept Purchase Orders & Net 30 Payment for Eligible Accounts
  • Industrial 4G LTE Modem Router, Serial to Cellular Modem USR-G781-AU (Antenna Included)

    Freq. Bands: B1-B2-B3-B5-B7-B8-B20-B28 (Telstra and all other AU providers)

    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.

    • 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

    List of Australia 4G LTE Frequencies


    Note: This kit includes the antenna, AU power adapter, and DB9 cable.

                                                   Operation Band
            Network Type G781 (Asia ) G781-E (Europe ) G781-AU ( Australia ) G781-A ( USA ) G781-V ( USA )
    4G FDD-LTE 1/3 1/3/5/7/8/20 1/2/3/4/5/6/7/8/28 2/4/12 4/13
    TDD-LTE 38/39/40/41 38/39/40/41 40
    3G WCDMA/HSPA/UMTS 1/8 1/8 1/2/5/8 2/4/5
    2G GPRS/GSM/EDGE 3/8 3/8 2/3/5/8

    Features of Industrial 4G LTE Modem router, Serial to Cellular Modem

    • OPEN WRT, support multiple developments
    • 2 RJ45 port, one can be WAN or LAN port and another one can be LAN port.
    • Support VPN(PPTP) client.
    • Support static routing
    • Support Firewall and QoS
    • Support DDNS
    • Support NTP to check the time.
    • Support TCP/UDP client mode and server mode.
    • Support identity packet and heartbeat packet.
    • Support Serial to HTTP format
    • Support upgrading firmware via FTP.
    • Integrated Hardware and software watchdog timer.


    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





    Specification of 4G LTE modems USR-G781

    USR-G781 Datasheet

    Development Files Link


    Industrial 4G LTE Router
    With Serial Port

    Serial Modem

    G781 integrates with routing and serial modem, which can easily achieve the
    bi-directional data transparent transmission between RS485/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.

    Registration Package plus Heartbeat Package

    The registration packet is sent to the server to identify the device.
    The heartbeat packet is used to judge the active state of the device when
    sent to the server, and actively collect data when sent to the serial terminal.
    The contents of registration package and heartbeat package,
    heartbeat interval can be modified by AT command.

    Industrial Design, Fit into Any Harsh Environment

    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.
    All components are selected according to industrial standards,Thicker and durable
    metal shell, ground screw protection.

    Data Security, Multiple VPN

    Supports mainstream VPN protocols, including PPTP, L2TP, IPSec, OpenVPN,
    and GRE. Multiple safe encryption methods make data safe
    transmission up to financial grade.

    Flexible networking

    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.

    Development Files
    [ Virtual COM Software] VCOM_Setup_EN_V4.0.6.4
    [[PC Test Software]] USR-TCP232-Test-V1.3
    [USR-G781] Setup Software V1.0.0.0
    [ Virtual COM Software]USR-VCOM_V3.7.2.529_Setup
    [AT Command] USR-G781-AT-Command-Set_V1.0.0
    [User Manual] USR-G781-User-Manual_V1.0.06.02
    [Specification] Specification of 4G LTE modems USR-G781
    [Certificate] M2M-Router-CE-Certificates
    [Certificate] USR-G781-4G-LTE-Modem-Router-ROHS2.0-2019
    [Datasheet] USR-G781 Datasheet

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