Industrial-Grade 4-Port Serial Device Server, RS232/422/485 software selectable, Optional Isolation, Dual power inputs, DIN-Rail mount

Modbus is an industry adopted communication protocol based on RTU, ASCII, and TCP protocols for various applications; these three protocols are commonly used by various equipments in the industry, such as DCS, PLC, HMI, power meters, various sensor and measuring instruments.

The Modbus Gateway is capable of implementing the Modbus protocol conversion between different hardware interfaces, thereby streamlining the process of management and application.

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 infrastruc- ture.

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.

Modbus ID Routing

Modbus Gateway is not only capable of hardware and protocol conversions, and when a Modbus ID conflict occurs, the Modbus Gateway also supports ID routing to the existing Modbus hardware.

Simple Integration for Complex Configurations

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


Connector RJ-45
Compliance IEEE 802.3 10BASE-T
IEEE 802.3u 100BASE-TX
Port(s) 2
Transmission Rate 10/100 Mbps
Connector DB9 (MB5404D-X)
3.81mm 5-pin Lockable Terminal Block (MB5404D-Sis-X)
Mode RS-232 / 422 / 485 (MB5404D-X)
RS-422 / 485 (MB5404D-X)
Isolation For SE5404D-Sis-X
Port(s) 4
Baud rate 300bps~230kbps
Parity None, Odd, Even, Mark, Space
Data bits 7,8
Stop Bit 1,2
Flow Control None, Xon/Xoff, RTS/CTS (MB5404D-X)
None, Xon/Xoff (MB5404D-Sis-X)
Connector 5.08mm 7-pin Lockable Terminal Block
Input Voltage 9-48 VDC
Input Current 0.65A
Power Consumption 5.85W max.
Reverse Polarity Protection Yes
Redundancy Yes
EMC FCC Class A, CE Class A
EMS ESD Level 3, RS Level 3, EFT Level 3, Surge Level 2, CS Level 3, PFMF Level 1, DIP.
Safety EN 60950-1
Shock IEC 60068-2-27
Freefall IEC 60068-2-32
Vibration IEC 60068-2-6
MTBF 21 years
Operating -40~80?(-40~176°F)
Storage -40°~85°C (-40°~185°F)
Humidity 5~95%RH(Non-condensing)
(W x H x D) 53.4mm x 145.7mm x 119.9mm
Material Metal
Installation Wall mount, DIN Rail (optional)
Reset Button Yes
Weight 900g
Main Feature ID Mapping, Modbus Caching, Modbus Routing
Configuration Serial Manager / Web UI / Telnet
Virtual COM Windows / Linux driver
Supported Protocol IPv4, ICMP, TCP, UDP, DHCP Client, SNMP, HTTP, Telnet, RFC2217, NTP, DNS, SMTP, Syslog
Link Mode
TCP Server 32 Modbus TCP Master/Slave Connections (shared by all COM ports), Virtual COM
Warranty 5 years