The Moxa MGate MB3170/MB3270 Series are advanced 1- and 2-port Modbus gateways designed to bridge Modbus RTU/ASCII with Modbus TCP. Engineered for industrial automation, these gateways offer reliable and flexible integration of serial devices into modern Ethernet-based networks. They support simultaneous access from Modbus TCP and serial masters, transparent Modbus communication, and built-in protocol monitoring.

The gateways handle up to 32 Modbus TCP clients and connect to up to 62 Modbus RTU/ASCII slaves. Routing is flexible via TCP port, IP address, or slave ID mapping. Auto Device Routing simplifies configuration, and the priority control function ensures timely response to urgent commands. Ethernet cascading and fiber options (up to 40 km) allow for robust and scalable deployment.

Isolation models provide 2 kV protection for serial ports, and wide-temperature variants operate reliably from -40 to 75°C. With advanced management, strong encryption, and DIN-rail mounting, the MB3170/MB3270 Series are ideal for demanding SCADA and remote automation environments.

Technical Details:

Network Interfaces:

• Ethernet: 2 x 10/100BaseT(X), RJ45, Auto MDI/MDI-X
• Isolation: 1.5 kV magnetic
• Fiber (100BaseFX):
• Multimode up to 4 km
• Singlemode up to 40 km

Protocols:

• Modbus TCP Client/Server
• Modbus RTU/ASCII Master/Slave
• Transparent Modbus mode

Management & Security:

• Configuration: Web Console (HTTP/HTTPS), Telnet, DSU, MGate Manager, MCC Tool
• Authentication: Local database
• Encryption: HTTPS, AES-128/256, SHA-256
• Protocols: SNMPv1/v2c/v3, HTTPS (TLS 1.2), NTP

Serial Interfaces:

• Ports: MB3170 = 1, MB3270 = 2
• 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/CTS, RTS Toggle (RS-232 only)
• Isolation (I models): 2 kV
• Signals:
• RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND
• RS-422: Tx+/-, Rx+/-, GND
• RS-485: 2-wire/4-wire with 1 kΩ / 150 kΩ pull-ups, 120 Ω terminator

Performance Features:

• Supports 32 Modbus TCP clients and 32 servers
• Up to 62 Modbus serial slaves
• Emergency request tunnel for real-time command priority
• Auto Device Routing for rapid deployment
• Serial master to serial slave bridging

Power:

• Input Voltage: 12–48 VDC
• Power Consumption:
• Standard models: 435 mA @ 12 VDC
• I / SC models: 510–555 mA @ 12 VDC
• Connector: 7-pin terminal block
• Relay Output: 1 A @ 30 VDC (resistive load)

Mechanical:

• Housing: Plastic
• IP Rating: IP30
• Dimensions (with ears): 29 x 89.2 x 124.5 mm
• Dimensions (without ears): 29 x 89.2 x 118.5 mm
• Weight:
• MB3170: 360 g
• MB3270: 380 g

Environmental:

• Operating Temperature:
• Standard: 0 to 60 °C
• Wide-temp: -40 to 75 °C
• Storage Temperature: -40 to 85 °C
• Humidity: 5 to 95% RH (non-condensing)

Certifications:

• EMC: EN 55032/35, FCC Part 15B
• EMS: IEC 61000-4-2/-3/-4/-5/-6/-8/-11
• Safety: UL 60950-1, UL 508, EN 62368-1
• Hazardous Locations: ATEX, IECEx, DNV
• Mechanical: IEC 60068-2-27/-2-32/-2-6/-2-64

MTBF (Telcordia SR332):

• MB3170: 1,662,526 hrs
• MB3270: 1,477,768 hrs
• MB3170I: 1,484,777 hrs
• MB3270I: 1,144,837 hrs

Warranty:

• 5-year manufacturer warranty

Package Contents:

• 1x MGate MB3170 or MB3270 gateway
• 1x Quick installation guide
• 1x Warranty card