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MGate MB3170/MB3270 Series

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Protocol Gateways  >   Modbus TCP Gateways

1 and 2-port advanced serial-to-Ethernet Modbus gateways

Product Feature

  • Supports Auto Device Routing for easy configuration
  • Supports route by TCP port or IP address for flexible deployment
  • Connects up to 32 Modbus TCP servers
  • Connects up to 31 or 62 Modbus RTU/ASCII slaves
  • Accessed by up to 32 Modbus TCP clients (retains 32 Modbus requests for each Master)
  • Supports Modbus serial master to Modbus serial slave communications
  • Built-in Ethernet cascading for easy wiring
  • 10/100BaseTX (RJ45) or 100BaseFX (single mode or multi-mode with SC/ST connector)
  • Emergency request tunnels ensure QoS control
  • Embedded Modbus traffic monitoring for easy troubleshooting
  • Serial port with 2 kV isolation protection (for “-I” models)
  • -40 to 75°C wide operating temperature models available
  • Supports redundant dual DC power inputs and 1 relay output


The MGate MB3170 and MB3270 are 1 and 2-port Modbus gateways, respectively, that convert between Modbus TCP, ASCII, and RTU communications protocols. The gateways provide both serial-to-Ethernet communication and serial (master) to serial (slave) communications. In addition, the gateways support simultaneously connecting serial and Ethernet masters with serial Modbus devices. The MGate MB3170 and MB3270 Series gateways can be accessed by up to 32 TCP master/clients or connect to up to 32 TCP slave/servers. Routing through the serial ports can be controlled by IP address, TCP port number, or ID mapping. A featured priority control function allows urgent commands to obtain an immediate response. All models are rugged, DIN-rail mountable, and offer optional built-in optical isolation for serial signals.


Integrate TCP Masters without Altering the Modbus RTU/ASCII Network or Software

The MB3270 can integrate Modbus TCP with Modbus RTU/ASCII, without modifying the existing Modbus RTU/ASCII architecture or software. With the serial redirector function, a serial master can maintain direct access to serial slave devices through a specially mapped serial port. This allows the serial and TCP masters to access serial slaves simultaneously.


Optical Fiber for Ethernet Communication

The MGate MB3170 Series includes 100BaseFX fiber models that support transmission distances up to 4 km for multi-mode models, and up to 40 km for single-mode models. Optical fiber is well-suited for industrial applications because it is immune to electromagnetic noise and interference. For environments that experience high ground loop voltages, fiber provides the best isolation protection, and because there is no danger of sparking, optical fiber is safer than copper wire to use in hazardous environments.


Auto-Device Routing for Easy Configuration (Patent Pending)

Moxa’s Auto-Device Routing function helps eliminate many of the problems and inconveniences encountered by engineers who need to configure large numbers of Modbus devices. A single mouse click is all that’s required to set up a slave ID routing table and configure Modbus gateways to automatically detect Modbus requests from a supervisory control and data acquisition (SCADA) system. By removing the need to manually create the slave ID routing table, the Auto-Device Routing function saves engineers significant time and cost.


Priority Control for Urgent Commands (Patented)

As Modbus networks increase in size and complexity, the lag time between commands and responses becomes a major concern. Advanced models of the MB3000 Series provide a priority control function for urgent commands, allowing users to force certain commands to get an immediate response. Depending on your system’s requirements, different methods are available to define which commands receive priority.

Patent Numbers: (US/TW)

  • US7,743,192 B2/I332618
  • US7,725,635 B2/I321007

Ethernet Interface

10/100BaseT(X) Ports (RJ45 connector)

2 (1 IP, Ethernet cascade)
Auto MDI/MDI-X connection

Magnetic Isolation Protection

1.5 kV (built-in)

Optical Fiber

Read more

Ethernet Software Features

Industrial Protocols

Modbus TCP Client (Master), Modbus TCP Server (Slave)

Configuration Options

Web Console (HTTP/HTTPS), Device Search Utility (DSU), MGate Manager, Telnet Console


ARP, DHCP Client, DNS, HTTP, HTTPS, SMTP, SNMP Trap, SNMPv1/v2c/v3, TCP/IP, Telnet, UDP, NTP Client


RFC1213, RFC1317

Time Management

NTP Client

Serial Interface

No. of Ports

MGate MB3170 Series: 1
MGate MB3270 Series: 2


MGate MB3170/MB3170I: DB9 male for RS-232 and terminal block for RS-422/485
MGate MB3270/MB3270I: 2 x DB9 male

Serial Standards

RS-232/422/485 (software selectable)


50 bps to 921.6 kbps

Data Bits

7, 8


None, Even, Odd, Space, Mark

Stop Bits

1, 2

Flow Control

DTR/DSR, RTS Toggle (RS-232 only), RTS/CTS

RS-485 Data Direction Control

ADDC® (automatic data direction control)

Pull High/Low Resistor for RS-485

1 kilo-ohm, 150 kilo-ohms

Terminator for RS-485

120 ohms


MGate MB3170I: 2 kV (I models)
MGate MB3170I-T: 2 kV (I models)
MGate MB3170I-M-SC: 2 kV (I models)
MGate MB3170I-M-SC-T: 2 kV (I models)
MGate MB3170I-S-SC: 2 kV (I models)
MGate MB3170I-S-SC-T: 2 kV (I models)
MGate MB3270I: 2 kV (I models)
MGate MB3270I-T: 2 kV (I models)

Serial Signals




Tx+, Tx-, Rx+, Rx-, GND


Data+, Data-, GND


Tx+, Tx-, Rx+, Rx-, GND

Serial Software Features

Industrial Protocols

Modbus RTU/ASCII Master, Modbus RTU/ASCII Slave

Modbus (Transparent)

Max. No. of Client Connections


Max. No. of Server Connections


Power Parameters

Input Voltage

12 to 48 VDC

Input Current

MGate MB3170/MB3270: 435 mA @ 12 VDC
MGate MB3170I/MB3170-S-SC/MB3170I-M-SC/MB3170I-S-SC: 555 mA @ 12 VDC
MGate MB3270I/MB3170-M-SC/MB3170-M-ST: 510 mA @ 12 VDC

Power Connector

7-pin terminal block


Contact Current Rating

Resistive load: 1 A @ 30 VDC

Physical Characteristics



IP Rating


Dimensions (with ears)

29 x 89.2 x 124.5 mm (1.14 x 3.51 x 4.90 in)

Dimensions (without ears)

29 x 89.2 x 118.5 mm (1.14 x 3.51 x 4.67 in)


MGate MB3170 Series: 360 g (0.79 lb)
MGate MB3270 Series: 380 g (0.84 lb)

Environmental Limits

Operating Temperature

MGate MB3170: 0 to 60°C (32 to 140°F)
MGate MB3170-T: -40 to 75°C (-40 to 167°F)
MGate MB3170-M-SC: 0 to 60°C (32 to 140°F)
MGate MB3170-M-SC-T: -40 to 75°C (-40 to 167°F)
MGate MB3170-M-ST: 0 to 60°C (32 to 140°F)
MGate MB3170-M-ST-T: -40 to 75°C (-40 to 167°F)
MGate MB3170-S-SC: 0 to 60°C (32 to 140°F)
MGate MB3170-S-SC-T: -40 to 75°C (-40 to 167°F)
MGate MB3170I: 0 to 60°C (32 to 140°F)
MGate MB3170I-T: -40 to 75°C (-40 to 167°F)
MGate MB3170I-M-SC: 0 to 60°C (32 to 140°F)
MGate MB3170I-M-SC-T: -40 to 75°C (-40 to 167°F)
MGate MB3170I-S-SC: 0 to 60°C (32 to 140°F)
MGate MB3170I-S-SC-T: -40 to 75°C (-40 to 167°F)
MGate MB3270: 0 to 60°C (32 to 140°F)
MGate MB3270-T: -40 to 75°C (-40 to 167°F)
MGate MB3270I: 0 to 60°C (32 to 140°F)
MGate MB3270I-T: -40 to 75°C (-40 to 167°F)

Storage Temperature (package included)

-40 to 85°C (-40 to 185°F)

Ambient Relative Humidity

5 to 95% (non-condensing)

Standards and Certifications


EN 55032/24


CISPR 32, FCC Part 15B Class A


IEC 61000-4-2 ESD: Contact: 6 kV; Air: 8 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 10 V/m
IEC 61000-4-4 EFT: Power: 4 kV; Signal: 2 kV
IEC 61000-4-5 Surge: Power: 2 kV
IEC 61000-4-6 CS: 10 V
IEC 61000-4-8 PFMF
IEC 61000-4-11 DIPs

Hazardous Locations

ATEX, Class I Division 2, IECEx




IEC 60068-2-32


IEC 60068-2-27


IEC 60068-2-6, IEC 60068-2-64


EN 60950-1, IEC 60950-1, IEC 62368-1, UL 62368-1



MGate MB3170/MB3170I Series: 1,349,710 hrs
MGate MB3170-M-SC/M-ST/S-SC Series: 1,175,887 hrs
MGate MB3170I-M-SC Series: 768,343 hrs
MGate MB3170I-S-SC Series: 763,707 hrs
MGate MB3270/MB3270I Series: 1,236,384 hrs


Telcordia SR332


Warranty Period

5 years


See www.moxa.com/warranty
Name Type Version Release Date
Datasheet for MGate MB3170/MB3270 Series Datasheet V1.0 12 November 2018

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