MB5901 - 1-Port Industrial Secure Modbus Gateway: DB9 Male


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MPN: 1P1MB5901DB001G

Manufacturer: Atop Technologies Inc.

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

Serial Connector Type

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Product Information

Product Description

Diverse Hardware Infrastructure
This 1 port Modbus serial to Modbus TCP secure gateway, supports the four most commonly used communication standards, RS-232/485/422, and Ethernet. The provided ease-of use configuration utility can quickly select the hardware interface , and easily switch to the existing communication infrastructure.

Industrial EMC protection and wide temperature operation capability make MB5901 ready for every mission.

Embedded Security and advanced features
The MB5901 Modbus Gateway supports OpenVPN and IPsec VPN encryption which allows safe use of 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
Standard Modbus protocol is supported and capable of converting any Modbus protocols between Modbus TCP, Modbus RTU, and Modbus ASCII for all supported hardware interfaces.

Modbus ID Routing
The MB5901 supports various types of hardware communication interfaces, Modbus protocol conversion, and Modbus ID routing. This means you can integrate your existing and complex Modbus hardware configuration into a simple network that can be easily managed.

Order Summary

 SKU Serial Connector Type Manufacturer Part # (MPN)
GC-ATOP-MB5901-DB DB9 Male 1P1MB5901DB001G
GC-ATOP-MB5901-TB Terminal Block 1P1MB5901TB001G


  • Industrial EMC protection, wide temperature operation, -40°C ~ 85°C (-40°F ~ 185°F)
  • 2-port 10/100Mbps Fast Ethernet, 1-port USB 2.0 high speed OTG
  • Bi-Directional Modbus TCP/RTU/ASCII conversion from Serial to Ethernet and Vice-versa
  • Advanced features include embedded IEEE802.1D-2004 RSTP Redundancy, SNMP v1/v2c/v3, Virtual ID remapping, VirtualCOM mode, exception
  • Rugged metal case with DIN-Rail mount
  • Configuration via Web Browser / Serial-Telnet Console / Windows Utility
  • Remote firmware upgrade

Documents and Drivers


MW5901 Modbus Gateway Datasheet

MW5901 Modbus Gateway User Guide

MW5901 Modbus Gateway Hardware Installation Guide

EC-Declaration of Conformity


Network Interface

Speed:   IEEE 802.3 10BaseT, IEEE 802.3u 100BaseT(X)

PoE standard supported:  IEEE 802.3 af (PoE)

Connector ports:  RJ45 x 2

Serial Interface


  • D-Sub9 RS-232/422/485 software selectable (DB models)
  • 5.08mm 5-Pin Terminal block RS-232/422/485 sw selectable (TB models)

Ports:  1

Baud Rate:  1,200 ~ 921,600 bps software selectable

Data Bits:  5, 6, 7, 8 software selectable

Stop Bits:  1, 2 software selectable

Flow Control:  None, Xon/Xoff, RTS/CTS

USB Interface

Ports:  1

Speed:  USB 2.0

Connector:  USB A Type


IPv4, ICMP, TCP, UDP, DHCP Client, SNMPv1,v2c,v3, HTTP, HTTPS, Telnet,
SMTP/TLS, PPTP, RFC2217, 802.1D-2004 RSTP, Security through OpenVPN
Client/Server or IPsec VPN (peer-to-peer or peer-to-side) with up to 37.9Mbps
VPN throughput


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)

Maximum number of Modbus clients/slaves

Modbus TCP: Maximum 16 clients; Maximum 32 slave connections

Input Voltage

9 - 48VDC (non-PoE Models); or through Ethernet Cable (PoE versions)

Input Current

0.65 A @ 9 VDC

Power Consumption

Approximately 6 W (Max)

Power Connector

3-Pin 5.08mm Lockable Terminal Block

Reverse Polarity Protection



IP30 SPCC housing


32 x 110 x 90 mm (1.26 x 4.33 x 3.54 in)


400g (0.88 lb)


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)

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