MGate MB3170-G2/MB3270-G2/MB3470-G2 Series

1, 2, and 4-port advanced serial-to-Ethernet Modbus gateways compliant with IEC62443-4-2

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Features and Benefits

Supports high-performing and low-latency agent mode to actively poll Modbus devices and cache data
Supports proprietary Modbus and Modbus extensions for various devices
Supports Auto Device Routing for easy configuration
Supports route by TCP port or IP address for different system architectures
Connects up to 32 Modbus TCP clients (MGate can queue 32 Modbus requests for each Modbus client connected)
Supports Modbus serial client to Modbus serial server communications
Ethernet cascading or dual subnet for flexible network system design
10/100BaseTX (RJ45) or 100BaseFX (single mode or multi-mode with SC/ST connector or SFP option)
Modbus communication test tools independant of external software
Intuitive Modbus diagnostics and traffic monitoring for easy troubleshooting
Serial port with 2 kV isolation protection (for -I models)
-40 to 75°C wide operating temperature range (-T models)
Supports redundant dual DC power inputs and 1 relay output

Certifications

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Introduction

The MGate MB3170-G2, MB3270-G2, and MB3470-G2 are new-generation Modbus gateways that convert between Modbus TCP, RTU, ASCII, and even proprietary or extended Modbus serial protocols. These MGate gateways transparently convert protocols, actively poll connected devices, and cache data in memory. These capabilities make it possible for SCADA systems to retrieve Modbus data directly from the gateway instead of waiting for all Modbus devices to respond, greatly increasing communication performance.

Moxa has developed the MGate Series using the IEC 62443-4-1 secure development life-cycle process ensuring secure connections and management of these gateways within industrial networks.

In addition, the user experience is enhanced by versatile installation options that accommodate diverse mounting and wiring requirements, a rugged design suitable for harsh environments, and easy-to-use configuration and troubleshooting tools for quick maintenance.

Hight-performance Modbus Conversion

MGate MB3170-G2/MB3270-G2/MB3470-G2 gateways operate in either transparent (direct protocol conversion) or agent (polling and caching) mode. Transparent mode converts protocols on a per-request basis. But for larger Modbus systems or when lower latency is needed, agent mode greatly enhances SCADA communication by directly accessing the gateway’s cache.

Flexible Modbus Conversion for Various Systems

Supporting dual subnet network configuration, the MGate seamlessly integrates Modbus TCP with Modbus RTU/ASCII without disrupting existing systems. With multiple serial port models, the MGate simultaneously converts between Modbus serial and Modbus TCP, as well as serial-to-serial and TCP-to-TCP. Even with legacy serial, or COM port-based software, the MGate’s Real COM mode enables communication through Ethernet TCP with no software adjustments. Beyond standard Modbus RTU and ASCII, the MGate also converts proprietary and extended Modbus serial protocols, eliminating the need for custom development or additional equipment and ensuring near-universal Modbus system compatibility. The MGate-G2 is capable of simultaneous conversion from proprietary serial and Modbus serial to Modbus TCP.

Intuitive Configuration and Minimal Maintenance

Downtime during maintenance can be costly. System alerts often require contacting vendors, prolonging troubleshooting due to information gathering and consultations. MGate-G2 gateways streamline this process by providing comprehensive troubleshooting information for rapid issue identification. One-click diagnostics gather all necessary data for technical support, empowering users to efficiently resolve issues and drastically reduce downtime.

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

2 (Ethernet cascade or dual subnet configured by software)
Auto MDI/MDI-X connection
Auto MDI/MDI-X connection
Magnetic Isolation Protection

1.5 kV (built-in)

Optical Fiber

		100BaseFX
		Multi-Mode		Single-Mode
Fiber Cable Type		OM1	50/125 µm	G.652
Fiber Cable Type		OM1	800 MHz x km	G.652
Typical Distance		4 km	5 km	40 km
Wavelength	Typical (nm)	1300		1310
	TX Range (nm)	1260 to 1360		1280 to 1340
	RX Range (nm)	1100 to 1600		1100 to 1600
Optical Power	TX Range (dBm)	-10 to -20		0 to -5
	RX Range (dBm)	-3 to -32		-3 to -34
	Link Budget (dB)	12		29
	Dispersion Penalty (dB)	3		1
Note: When connecting a single-mode fiber transceiver, we recommend using an attenuator to prevent damage caused by excessive optical power. Note: Compute the “typical distance” of a specific fiber transceiver as follows: Link budget (dB) > dispersion penalty (dB) + total link loss (dB).

Industrial Protocols

Modbus TCP Client
Modbus TCP Server
Configuration Options

Web Console (HTTP/HTTPS)
Device Search Utility (DSU)
MCC Tool
Windows Driver Manager Utility
MXview One Software
MXconfig Software
Management

ARP
DHCP Client
DNS
HTTPS
ICMP
IPv4/IPv6
SMTP
SMTPS
SNMPv1/v2c/v3
SNTP
TCP/IP
UDP
MIB

MIB-II
RFC1213, RFC1317
Time Management

SNTP Client

Authentication

Local database
Encryption

AES-128
AES-256
ECC-256
ECC-384
ECC-521
HMAC
RSA-1024
RSA-2048
RSA-3072
RSA-4096
SHA-256
SHA-384
Security Protocols

SNMPv3
HTTPS (TLS 1.2)

No. of Ports

MGate MB3170-G2 models: 1
MGate MB3270-G2 models: 2
MGate MB3470-G2 models: 4
Connector

MGate MB3170-G2/MB3270-G2/MB3470-G2 models: 1/2/4 x DB9 male
MGate MB3270-TB-G2/MB3470-TB-G2 models: 2/4 x 5-pin spring type terminal block
Serial Standards

RS-232/422/485 (software-selectable)
Baudrate

50 bps to 921.6 kbps
Data Bits

7, 8
Parity

None
Even
Odd
Space
Mark
Stop Bits

1, 2
Flow Control

DTR/DSR
RTS Toggle (RS-232 only)
RTS/CTS
Pull High/Low Resistor for RS-485

1 kilo-ohm, 150 kilo-ohms
(software selectable)
Terminator for RS-485

120 ohms
(software selectable)
Isolation

I models: 2 kV
RS-485 Data Direction Control

ADDC (automatic data direction control)

RS-232

TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND
or
TxD, RxD, GND (for -TB models)
RS-422

Tx+, Tx-, Rx+, Rx-, GND
RS-485-2w

Data+, Data-, GND
RS-485-4w

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

Industrial Protocols

Modbus RTU/ASCII Client
Modbus RTU/ASCII Server
Proprietary Modbus

Max. No. of Client Connections

32
Max. No. of Server Connections

32

Input Voltage

12 to 48 VDC
Input Current

MGate MB3170-G2, MGate MB3170I-G2: 270mA @ 21V
MGate MB3270-G2, MGate MB3270-TB-G2, MGate MB3270I-G2, MGate MB3270I-TB-G2:: 330mA @ 12V
MGate MB3470-G2, MGate MB3470-TB-G2, MGate MB3470I-G2, MGate MB3470I-TB-G2, MGate MB3170-S-SC-G2, MGate MB3170I-S-SC-G2, MGate MB3170-M-SC-G2, MGate MB3170I-M-SC-G2, MGate MB3170-M-ST-G2, MGate MB3170-SFP-G2: 377 mA @ 12V
Power Connector

8-pin terminal block

Contact Current Rating

Resistive load: 1 A @ 30 VDC

Housing

Metal
IP Rating

IP30
Dimensions (with ears)

MGate MB170-G2/MB3270-G2 models:
29 x 89 x 132 mm (1.14 x 3.50 x 5.19 in)
MGate MB3470-G2 models:
42 x 89 x 132 mm (1.65 x 3.50 x 5.19 in)
Dimensions (without DIN-rail mouting kit)

MGate MB170-G2/MB3270-G2 models:
29 x 89 x 129 mm (1.14 x 3.50 x 5.08 in)
MGate MB3470-G2 models:
42 x 89 x 129 mm (1.65 x 3.50 x 5.08 in)
Weight

MGate MB3170-G2 models: TBD
MGate MB3270-G2 models: TBD
MGate MB3470-G2 models: TBD

Operating Temperature

Standard models : -10 to 60°C (14 to 140°F)
Wide temp. models: -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)

EMC

EN 61000-6-2/-6-4
EMI

CISPR 32, FCC Part 15B Class A
EMS

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

ATEX
Class I Division 2
IECEx
Maritime

DNV
Package Drop Test

ISTA 1A
Vibration

IEC 60068-2-6
Safety

EN 62368-1
UL 62368-1

Time

MGate MB3170 models: 1,662,526 hrs
MGate MB3170I models: 1,484,777 hrs
MGate MB3270 models: 1,477,768 hrs
MGate MB3270I models: 1,144,837 hrs
MGate MB3170-M/-S models: 1,580,051 hrs
MGate MB3170I-M/-S models: 1,385,414 hrs
Standards

Telcordia Standard SR-332

Warranty Period

5 years
Details

See www.moxa.com/warranty

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Software, Firmware, and Drivers

Name	Type	Checksum	Version	Operating System	Release Date
Moxa CLI Configuration Tool for Linux 11.6 MB	Utility	4003D7F9F6F7DC5F64893018AAE59AF552AAEDEEB0C917A7FD0279C5536AA0566F621F1625C3F96EE718284F78CAEA76C4D56E67C999797B88E6DBE5AA80B5B5 SHA-512	v1.5	Linux Kernel 2.6.x Linux Kernel 3.x Linux Kernel 4.x Linux Kernel 5.x Linux Kernel 6.x	Aug 05, 2025 Aug 05, 2025 Release notes

Support Documents

Name	Type	Version	Release Date
Datasheet for MGate MB3170-G2/MB3270-G2/MB3470-G2 Series 1.1 MB	Datasheet	v1.0	Oct 01, 2025 Oct 01, 2025

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Available Models (28)

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	Compare MGate MB3270-TB-G2-T	Compare MGate MB3270-TB-G2	Compare MGate MB3170I-G2-T	Compare MGate MB3170I-G2
Ethernet	2 x RJ45	2 x RJ45	2 x RJ45	2 x RJ45
No. of Serial Ports	2	2	1	1
Serial Connector	5-pin Terminal Block	5-pin Terminal Block	DB9	DB9
Serial Isolation	–	–	2 kV	2 kV
Operating Temperature	-40 to 75°C	-10 to 60°C	-40 to 75°C	-10 to 60°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag

	Compare MGate MB3270-G2-T	Compare MGate MB3270-G2	Compare MGate MB3470I-TB-G2	Compare MGate MB3470-TB-G2-T
Ethernet	2 x RJ45	2 x RJ45	2 x RJ45	2 x RJ45
No. of Serial Ports	2	2	4	4
Serial Connector	DB9	DB9	5-pin Terminal Block	5-pin Terminal Block
Serial Isolation	–	–	2 kV	–
Operating Temperature	-40 to 75°C	-10 to 60°C	-10 to 60°C	-40 to 75°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag

	Compare MGate MB3470-TB-G2	Compare MGate MB3170-SFP-G2	Compare MGate MB3170-S-SC-G2-T	Compare MGate MB3170-M-ST-G2-T
Ethernet	2 x RJ45	1 x RJ45 1 x SFP slot	1 x RJ45 1 x Single-mode SC fiber	1 x RJ45 1 x Multi-mode ST fiber
No. of Serial Ports	4	1	1	1
Serial Connector	5-pin Terminal Block	DB9	DB9	DB9
Serial Isolation	–	–	–	–
Operating Temperature	-10 to 60°C	-10 to 60°C	-40 to 75°C	-40 to 75°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag

	Compare MGate MB3470I-TB-G2-T	Compare MGate MB3170-S-SC-G2	Compare MGate MB3470I-G2-T	Compare MGate MB3470-G2
Ethernet	2 x RJ45	1 x RJ45 1 x Single-mode SC fiber	2 x RJ45	2 x RJ45
No. of Serial Ports	4	1	4	4
Serial Connector	5-pin Terminal Block	DB9	DB9	DB9
Serial Isolation	2 kV	–	2 kV	–
Operating Temperature	-40 to 75°C	-10 to 60°C	-40 to 75°C	-10 to 60°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag

	Compare MGate MB3170-M-ST-G2	Compare MGate MB3270I-G2-T	Compare MGate MB3270I-G2	Compare MGate MB3470I-G2
Ethernet	1 x RJ45 1 x Single-mode ST fiber	2 x RJ45	2 x RJ45	2 x RJ45
No. of Serial Ports	1	2	2	4
Serial Connector	DB9	DB9	DB9	DB9
Serial Isolation	–	2 kV	2 kV	2 kV
Operating Temperature	-10 to 60°C	-40 to 75°C	-10 to 60°C	-10 to 60°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag

	Compare MGate MB3470-G2-T	Compare MGate MB3170-M-SC-G2-T	Compare MGate MB3170-SFP-G2-T	Compare MGate MB3270I-TB-G2-T
Ethernet	2 x RJ45	1 x RJ45 1 x Single-mode SC fiber	1 x RJ45 1 x SFP slot	2 x RJ45
No. of Serial Ports	4	1	1	2
Serial Connector	DB9	DB9	DB9	5-pin Terminal Block
Serial Isolation	–	–	–	2 kV
Operating Temperature	-40 to 75°C	-40 to 75°C	-40 to 75°C	-40 to 75°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag

	Compare MGate MB3270I-TB-G2	Compare MGate MB3170-M-SC-G2	Compare MGate MB3170-G2-T	Compare MGate MB3170-G2
Ethernet	2 x RJ45	1 x RJ45 1 x Multi-mode SC fiber	2xRJ45	2 x RJ45
No. of Serial Ports	2	1	1	1
Serial Connector	5-pin Terminal Block	DB9	DB9	DB9
Serial Isolation	2 kV	–	–	–
Operating Temperature	-10 to 60°C	-10 to 60°C	-40 to 75°C	-10 to 60°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag