MB5904D-G - 4-Port Industrial Modbus Serial Gigabit Fiber: DB9


Leave a review


MPN: 1P1MB5904D0004G

Manufacturer: Atop Technologies Inc.

Delivery: Ships within 6-7 weeks
Qualifies for Free shipping to the US

Serial Connector & Isolation Options

We Have You Covered

Price Match delivery truck

1 year comprehensive warranty support for all products

hand receiving items

30 day money back guarantee

*some exceptions apply

Product Information

Product Description

Diverse Hardware Infrastructure
Modbus Gateway supports the four most commonly used communication standards, RS-232/485/422, and Ethernet. The ease-of use configuration utility provides Modbus Gateway with a quick way to select the hardware interface and easily switch to the existing communication infrastructure.  Industrial EMC protection and wide temperature operation capability make MB5904D ready for every mission.

    Advanced embedded security and advanced features

    The MB5904D Modbus Gateway supports OpenVPN and IPsec VPN encryption, allowing you to safely use the device over the internet without worrying about malicious attacks, data sniffing or unintentional remote control of your Modbus slaves. On your LAN, RSTP protocol will provide an additional layer of security in case of link losses.

    Switching between Modbus Protocols
    Supporting the standard Modbus protocol, this gateway is capable of converting any Modbus protocols between Modbus TCP, Modbus RTU, and Modbus ASCII for all supported hardware interfaces. All of this, in bidirectional mode: select Ethernet and Serial ends to be either master or slave Modbus ID Routing. 

    The MB5904D supports various types of hardware communication interfaces, Modbus protocol conversion, and Modbus ID routing. Therefore the Modbus Gateway can integrate your existing and complex Modbus hardware configuration into a simple network that can be easily managed.

    Order Summary


     SKU Serial Connector Isolation Manufacturer Part # (MPN)
    GC-ATOP-MB5904D-4P-DB DB9 No 1P1MB5904D0004G
    GC_ATOP-MB5904D-4P-TB TB5 No 1P1MB5904D0005G
    GC-ATOP-MB5904D-4P-Sis TB5 Isolation 1P1MB5904D0006G


    • Industrial EMC protection, wide temperature operation,-40°C ~ 85°C (-40°F ~ 185°F)
    • 2 Fast-Ethernet ports or 100/1000 SFP slots
    • 4 Software-selectable RS-232/RS-485/RS-422 serial ports, up to 921kbps
    • Bi-Directional Modbus TCP/RTU/ASCII conversion from Serial to Ethernet and vice-versa, VirtualCOM support, advanced Modbus Options available
    • Isolated Redundant 12~48 VDC Power Inputs
    • Embedded security with PPTP, IPsec or OpenVPN (client/server)
    • Configuration via Web Browser/ Serial Console/ Telnet Console/ Utility
    • Rugged metal case with DIN-Rail mount     

    Documents and Drivers


    MB5904D Datasheet

    MB5904D User Manual

    MB5904D Hardware Installation Guide

    MB5904D UKCA-Declaration of Conformity


    Network Speed

    • IEEE 802.3 10BaseT
    • IEEE 802.3u 100BaseT(X)

    Network LAN Mode

    Dual Subnets or Network Redundancy

    Network Connector Ports

    2x 10/100BASE-T(X) RJ-45

    Serial Connector

    1x2 5 pin 3.81mm Terminal Block, or D-sub9 connector

    Serial Ports


    Serial Mode

    RS-232/422/485, software selectable

    Serial Baud Rate

    1,200~921,600 bps

    Serial Parity

    None, Odd, Even

    Serial Data Bits


    Serial Stop Bits


    Serial Isolation

    2 KV

    USB Ports


    USB Speed

    USB 2.0

    USB Connector

    USB A Type


    IPv4, ICMP, TCP, UDP, DHCP Client, SNMPv1,v2c,v3, HTTP, HTTPS, Telnet, RFC2217, RSTP, Security via PPTP, OpenVPN Client/Server or IPsec (peer-to-peer or peer-to-side) with up to 37.9Mbps VPN throughput,SMTP/TLS


    Atop Management Utility, Web UI, Telnet


    Windows/Linux redirection software

    Modbus Gateway Supported Modes

    Ethernet: Modbus TCP Server/Client(or VCOM)
    Serial: Modbus RTU/ASCII (master/slave)

    Input Voltage

    Dual 12 - 48VDC

    Input Current

    0.65 A @ 12 VDC

    Power Consumption

    Approximately 8 W (Max)

    Power Connector

    7-Pin 5.08mm Lockable Terminal Block

    Power Redundancy


    Reverse Polarity Protection


    Relay Output

    1A @ 30 VDC (normal open)


    IP30 SPCC housing


    54 x 145 x 113 mm  (2.1 x 5.1 x 4.4 in)


    1000g  (2.2 lbs)


    DIN Rail

    Reset Button



    • Operating:  -40°C ~ 85°C (-40°F ~ 185°F)
    • Storage:  -40°C ~ 85°C (-40°F ~ 185°F)
    • Ambient Relative Humidity: 5%~95%, 55°C (Non-condensing)

    You Might Be Interested In

    Request a Quote

    Curious about bulk pricing? Please fill out the information below and our sales team will provide a quote within 1 business day.

    Customer Reviews