MB5908 - 8 Port Industrial Modbus Serial to Modbus TCP gateway: 24~48 VDC - No Isolation


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MPN: 1P1MB590800001G

Manufacturer: Atop Technologies Inc.

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

Power Input


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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 provided with Modbus Gateway can quickly select the hardware interface, and easily switch to the existing communication infrastructure. Set up via Web Browser, Serial Console, Telnet Console, Windows Utility or through the LCM display in front of the device.

Industrial EMC protection makes MB5908 ready for every mission.

Security and Redundancy
MB5908 embeds OpenVPN and IPsec VPN, that allows you to tunnel your data securely through the internet and prevent unauthorized control of your Serial Devices by malicious people. The integrated Rapid Spanning Tree Protocol (RSTP), allows you to add a backup Ethernet link in the event the primary one fails.

Switching between Modbus Protocols
Modbus Gateway supports the standard Modbus protocol and is capable of converting any Modbus protocols between Modbus TCP, Modbus RTU, and Modbus ASCII for all supported hardware interfaces. All of this can be accomplished in bidirectional mode; select Ethernet and aerial ends to be either master or slave.

Modbus ID Routing
Modbus Gateway 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 Power Input Isolation Manufacturer Part # (MPN)
GC-ATOP-MB5908-DC 24~48 VDC No 1P1MB590800001G
GC-ATOP-MB5908-SIS-DC 24~48 VDC Isolation 1P1MB590800002G
GC-ATOP-MB5908-US 100~240 VAC No 1P1MB590800003G
GC-ATOP-MB5908-SIS-US 100~240 VAC Isolation 1P1MB590800014G


  • Industrial EMC protection, Optional serial port isolation, -20°C ~ 70°C (-4°F ~ 158°F) operation
  • 2 Fast-Ethernet ports, dual-subnet or redundancy
  • 8 switch-selectable RS-232/485/422 RJ45 serial ports, up to 921kbps
  • 24~48 VDC Power Input or 100~240 VAC Power input (US version)
  • Bi-Directional Modbus TCP/RTU/ASCII conversion from Serial to Ethernet and vice-versa, VirtualCOM support, advanced Modbus Options available
  • Supports SNMPv1/v2c/v3, Embedded security with IPsec VPN
  • Configuration via Web Browser / Serial Console / Telnet Console / Windows Utility / LCM Matrix
  • Integrated RSTP redundancy

Documents and Drivers


MB5908 Datasheet

MB5908 User Manual

MB5908 Hardware Installation Guide

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


  • RJ45 RS-232/422/485 software selectable
  • RJ45 Isolated RS-422/485 software selectable (-SiS models)

Serial Ports


Serial Baud Rate

1,200 ~ 921,600 bps software selectable

Serial Data Bits

5, 6, 7, 8 software selectable

Serial Stop

1, 2 software selectable

Serial Parity

None, Odd, Even, Space, Mark

Serial Flow Control

None, Xon/Xoff, RTS/CTS (RS-232 only)

Serial Isolation

2.5 kV (SIS versions only)


Telnet, RFC2217, RSTP, Security through OpenVPN and IPsec (host-to-host or
host-to-side) with up to 37.9Mbps VPN throughput, and PPTP


Atop Management Utility, Web UI, Telnet, Serial Console, LCM Display


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


IP30, metal housing


436 mm x 43.5 mm x 200 mm (17.1 x 1.7 x 7.9 in)


3,000g   (6.1 lbs)


19’’ Rack-Mount (Kit included)

Reset Button



Operating:   20°C~70°C (-4°F~158°F)

Storage:   40°C~85°C (-40°F~185°F)

Ambient Relative Humidity: 5%~95%, 55°C (Non-condensing)

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