Moxa

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

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

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

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)
  • Supports redundant dual DC power inputs and 1 relay output
  • Compliance with IEC 62443-4-2 Security Level 2 requirements
  • -40 to 75°C wide operating temperature range (-T models)

Certifications

  • DNV
  • CE
  • FCC
  • Iecex

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.

Models in this series (28)

MGate MB3170-G2MGate MB3170-G2-TMGate MB3170-M-SC-G2MGate MB3170-M-SC-G2-T
Ethernet2 x RJ452xRJ451 x RJ45 1 x Multi-mode SC Fiber1 x RJ45 1 x Multi-mode SC Fiber
No. of Serial Ports1111
Serial ConnectorDB9DB9DB9DB9
Serial Isolation
Operating Temperature-10 to 60°C-40 to 75°C-10 to 60°C-40 to 75°C
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MGate MB3170-M-ST-G2MGate MB3170-M-ST-G2-TMGate MB3170-S-SC-G2MGate MB3170-S-SC-G2-T
Ethernet1 x RJ45 1 x Multi-mode ST Fiber1 x RJ45 1 x Multi-mode ST Fiber1 x RJ45 1 x Single-mode SC Fiber1 x RJ45 1 x Single-mode SC Fiber
No. of Serial Ports1111
Serial ConnectorDB9DB9DB9DB9
Serial Isolation
Operating Temperature-10 to 60°C-40 to 75°C-10 to 60°C-40 to 75°C
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MGate MB3170-SFP-G2MGate MB3170-SFP-G2-TMGate MB3170I-G2MGate MB3170I-G2-T
Ethernet1 x RJ45 1 x SFP Slot1 x RJ45 1 x SFP Slot2 x RJ452 x RJ45
No. of Serial Ports1111
Serial ConnectorDB9DB9DB9DB9
Serial Isolation2 kV2 kV
Operating Temperature-10 to 60°C-40 to 75°C-10 to 60°C-40 to 75°C
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MGate MB3270-G2MGate MB3270-G2-TMGate MB3270-TB-G2MGate MB3270-TB-G2-T
Ethernet2 x RJ452 x RJ452 x RJ452 x RJ45
No. of Serial Ports2222
Serial ConnectorDB9DB95-pin Terminal Block5-pin Terminal Block
Serial Isolation
Operating Temperature-10 to 60°C-40 to 75°C-10 to 60°C-40 to 75°C
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MGate MB3270I-G2MGate MB3270I-G2-TMGate MB3270I-TB-G2MGate MB3270I-TB-G2-T
Ethernet2 x RJ452 x RJ452 x RJ452 x RJ45
No. of Serial Ports2222
Serial ConnectorDB9DB95-pin Terminal Block5-pin Terminal Block
Serial Isolation2 kV2 kV2 kV2 kV
Operating Temperature-10 to 60°C-40 to 75°C-10 to 60°C-40 to 75°C
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MGate MB3470-G2MGate MB3470-G2-TMGate MB3470-TB-G2MGate MB3470-TB-G2-T
Ethernet2 x RJ452 x RJ452 x RJ452 x RJ45
No. of Serial Ports4444
Serial ConnectorDB9DB95-pin Terminal Block5-pin Terminal Block
Serial Isolation
Operating Temperature-10 to 60°C-40 to 75°C-10 to 60°C-40 to 75°C
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MGate MB3470I-G2MGate MB3470I-G2-TMGate MB3470I-TB-G2MGate MB3470I-TB-G2-T
Ethernet2 x RJ452 x RJ452 x RJ452 x RJ45
No. of Serial Ports4444
Serial ConnectorDB9DB95-pin Terminal Block5-pin Terminal Block
Serial Isolation2 kV2 kV2 kV2 kV
Operating Temperature-10 to 60°C-40 to 75°C-10 to 60°C-40 to 75°C
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Specifications

Shown for MGate MB3170-G2. Per-model differences are listed in the selection grid above.

Ethernet Interface

10/100BaseT(X) Ports (RJ45 connector)
2 (Ethernet cascade or dual subnet configured by software) Auto MDI/MDI-X connection
Magnetic Isolation Protection
1.5 kV (built-in)
Optical Fiber
Read more 100BaseFX Multi-Mode Single-Mode Fiber Cable Type OM1 50/125 µm G.652 800 MHz x km 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).

Ethernet Software Features

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
System Log Count
Local: 10,000 max.

Security Functions

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)

Serial Interface

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)
Bitrate
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)

Serial Signals

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

Serial Software Features

Industrial Protocols
Modbus RTU/ASCII Client Modbus RTU/ASCII Server (supported in Agent mode) Proprietary Modbus Serial Client

Modbus (Transparent)

Max. No. of Client Connections
32
Max. No. of Server Connections
32

Modbus RTU/ASCII (Agent)

Mode
Client (Master) Server (Slave) Proprietary Serial (client)
Functions Supported
1, 2, 3, 4, 5, 6, 15, 16, 23
Max. No. of Commands
128/serial port
No. of Tags
MGate MB3170–G2 models: 150 MGate MB3270–G2 models: 300 MGate MB3470–G2 models: 600
Total Tag Size
MGate MB3170–G2 models: 2048 Bytes MGate MB3270–G2 models: 3072 Bytes MGate MB3470–G2 models: 4096 Bytes

Modbus TCP (Agent)

Mode
Client (Master) Server (Slave)
Max. No. of Client Connections
32
Max. No. of Server Connections
32
Functions Supported
1, 2, 3, 4, 5, 6, 15, 16, 23
Max. No. of Commands
128
No. of Tags
MGate MB3170–G2 models: 150 MGate MB3270–G2 models: 300 MGate MB3470–G2 models: 600
Total Tag Size
MGate MB3170–G2 models: 2048 Bytes MGate MB3270–G2 models: 3072 Bytes MGate MB3470–G2 models: 4096 Bytes

Power Parameters

Input Voltage
12 to 48 VDC
Input Current
MGate MB3170-G2/MB3270-G2 models: 452 mA @ 12 VDC MGate MB3470-G2 models: 583 mA @ 12 VDC
Power Connector
8-pin terminal block

Relays

Contact Current Rating
Resistive load: 1 A @ 30 VDC

Physical Characteristics

Housing
Metal
IP Rating
IP30
Dimensions (with ears)
MGate MB170-G2/MB3270-G2 models: 25 x 89 x 132 mm (0.98 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: 25 x 89 x 129 mm (0.98 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: 338 g (0.75 lb) MGate MB3270-G2 models: 393 g (0.87 lb) MGate MB3470-G2 models: 444 g (0.98 lb)

Environmental Limits

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)

Standards and Certifications

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: 2 kV IEC 61000-4-5 Surge: Power: 2 kV, Signal: 1 kV IEC 61000-4-6 CS: 150 kHz to 80 MHz: 10 V/m; Signal: 10 V/m IEC 61000-4-8 PFMF IEC 61000-4-11
Hazardous Locations
ATEX Class I Division 2 IECEx
Maritime
DNV Certified with 24 VDC power input
Safety
EN 62368-1 UL 62368-1
Vibration
IEC 60068-2-6
Package Drop Test
ISTA 1A

MTBF

Time
MGate MB3170-G2 models: 3,238,923 hrs MGate MB3170I-G2 models: 3,156,544 hrs MGate MB3170-S/M-SC-G2/M-ST-G2 models: 2,889,487 hrs MGate MB3170-SFP-G2 models: 3,109,327 hrs MGate MB3270-TB-G2 models: 2,943,248 hrs MGate MB3270-G2 models: 2,931,934 hrs MGate MB3270I-TB-G2 models: 2,809,979 hrs MGate MB3270I-G2 models: 2,799,662 hrs MGate MB3470-TB-G2 models: 2,377,791 hrs MGate MB3470-G2 models: 2,363,042 hrs MGate MB3470I-TB-G2 models: 2,208,607 hrs MGate MB3470I-G2 models: 2,195,874 hrs
Standards
Telcordia Standard SR-332

Warranty

Warranty Period
5 years
Details
See www.moxa.com/warranty

Resources

NameTypeVersionDate
Firmware for MGate MB3170-G2/MB3270-G2/MB3470-G2 Series4.0 MBFirmwarev1.1Apr 30, 2026 Apr 30, 2026 Release notes
Moxa CLI Configuration Tool (Linux)11.3 MBUtilityv1.6Feb 02, 2026 Feb 02, 2026 Release notes
Moxa CLI Configuration Tool (Windows)2.1 MBUtilityv1.6Feb 02, 2026 Feb 02, 2026 Release notes
Moxa Windows Driver Manager (Windows 11 and Server 2022 and later, WHQL certified)11.9 MBDriverv4.5Jan 09, 2026 Jan 09, 2026 Release notes
Moxa Windows Driver Manager (Windows 7 to 10 and Windows Server 2008 R2 to 2019, WHQL certified)12.2 MBDriverv3.8Jan 09, 2026 Jan 09, 2026 Release notes
Device Search Utility (installer)236.2 MBUtilityv3.1Nov 17, 2025 Nov 17, 2025 Release notes
Device Search Utility (portable)128.6 MBUtilityv3.1Nov 17, 2025 Nov 17, 2025 Release notes
MXconfig Plugin1.8 MBSoftware Packagev1.8Oct 02, 2025 Oct 02, 2025 Release notes
MXview One plugin (Windows)22.6 MBSoftware Packagev1.8Oct 01, 2025 Oct 01, 2025 Release notes
MXview One plugin (Linux)21.7 MBSoftware Packagev1.8Oct 01, 2025 Oct 01, 2025 Release notes
Moxa CLI Configuration Tool (Windows)2.0 MBUtilityv1.5Jul 30, 2025 Jul 30, 2025 Release notes
Datasheet for MGate MB3170-G2/MB3270-G2/MB3470-G2 Series1.2 MBDatasheetv1.2Jul 28, 2026
Moxa CLI Configuration Tool User Manual850.9 KBManualv2.5Feb 12, 2026
Tech Note: The Migration Guide for the MGate MB3170 G2/MB3270-G2 Series968.8 KBTech Notev1.0Dec 12, 2025
Device Search Utility v3.x User Manual2.8 MBManualv1.1Nov 17, 2025
Manual for MGate MB3170-G2/MB3270-G2/MB3470-G2 Series17.3 MBManualv1.1Nov 11, 2025
FOSS statement for MGate MB3170-G2/MB3270-G2/MB3470-G2 Series374.8 KBDeclarationv1.0Sep 30, 2025
QIG for MGate MB3170-G2/MB3270-G2/MB3470-G2 Series3.5 MBQIGv1.0Sep 30, 2025
Tech Note for MGate MB317Tech Note: The Security Hardening Guide for the MGate MB3x70-G2 Series1.0 MBTech Notev1.0Sep 30, 2025
Declaration of Conformity (EU/UK) for MGate MB3000-G2/NPort IA5000-G2 Series353.3 KBDeclarationv1.0Sep 15, 2025
FOSS Statement for Moxa CLI Configuration Tool114.6 KBDeclarationv1.0Dec 10, 2024
FOSS Statement for Device Search Utility161.8 KBDeclarationv1.0Jun 24, 2024

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