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MGate MB3660 Series

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Protocol Gateways  >   Modbus TCP Gateways

8 and 16-port redundant Modbus gateways

Product Feature

  • Supports Auto Device Routing for easy configuration
  • Supports route by TCP port or IP address for flexible deployment
  • Innovative Command Learning for improving system performance
  • Supports agent mode for high performance through active and parallel polling of serial devices
  • Supports Modbus serial master to Modbus serial slave communications
  • 2 Ethernet ports with the same IP or dual IP addresses for network redundancy
  • microSD card for configuration backup/duplication and event logs
  • Accessed by up to 256 Modbus TCP clients
  • Connects up to Modbus 128 TCP servers
  • RJ45 serial interface (for “-J” models)
  • Serial port with 2 kV isolation protection (for “-I” models)
  • Dual VDC or VAC power inputs with wide power input range
  • Embedded traffic monitoring/diagnostic information for easy troubleshooting
  • Status monitoring and fault protection for easy maintenance


The MGate MB3660 (MB3660-8 and MB3660-16) gateways are redundant Modbus gateways that convert between the Modbus TCP and Modbus RTU/ASCII protocols. They can be accessed by up to 256 TCP master/client devices, or connect to 128 TCP slave/server devices. The MGate MB3660 isolation model provides 2 kV isolation protection suitable for power substation applications. The MGate MB3660 gateways are designed to easily integrate Modbus TCP and RTU/ASCII networks. The MGate MB3660 gateways offer features that make network integration easy, customizable, and compatible with almost any Modbus network.

For large-scale Modbus deployments, MGate MB3660 gateways can effectively connect a large number of Modbus nodes to the same network. The MB3660 Series can physically manage up to 248 serial slave nodes for 8-port models or 496 serial slave nodes for 16-port models (the Modbus standard only defines Modbus IDs from 1 to 247). Each RS-232/422/485 serial port can be configured individually for Modbus RTU or Modbus ASCII operation and for different baudrates, allowing both types of networks to be integrated with Modbus TCP through one Modbus gateway.


High Performance with Innovative Command Learning

The MGate MB3660 gateways support two communication modes: transparent mode and agent mode. For transparent mode, the gateway converts Modbus commands from Modbus TCP to Modbus RTU/ASCII, and vice versa, or from serial (master) to serial (slave). However, since only one Modbus protocol request-response action can be executed at any given time, each Modbus device has to wait its turn, resulting in poorer performance.

In order to provide better performance, the MGate MB3660 gateways are designed with an innovative Command Learning function, which can be activated with a single mouse click. Once activated, the gateway will learn and remember the Modbus commands it receives, and once a command has been learned, the gateway will act as though it were in agent mode, and actively send Modbus requests to the relevant Modbus devices. Since the data is saved in a different memory space that can be accessed by the SCADA system, the SCADA system can retrieve Modbus response data directly from the gateway’s memory, instead of waiting for the data to pass through the Modbus devices, dramatically increasing communication performance.


Auto-Device Routing for Easy Configuration (Patented)

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 reduces cost.


Modbus Gateway with Power and Ethernet Redundancy

For a complicated Modbus system, redundancy is extremely important. The MGate MB3660 Modbus gateways support redundancy for both the power input and Ethernet connection. The MGate MB3660 gateways come with dual AC or DC power inputs built in for power redundancy, and have dual Ethernet ports (with different IPs) for network redundancy. To accommodate different types of applications, the dual Ethernet ports can be configured in one of two ways:

  • Use the same IP for both Ethernet ports. In this case, the MGate MB3660 gateway will automatically switch to the backup LAN when the main LAN fails.
  • Use different IP addresses for each of the two Ethernet ports. In this case, Modbus clients/masters can use both Ethernet ports to communicate with Modbus RTU/ASCII slave devices at the same time.

Ethernet Interface

10/100BaseT(X) Ports (RJ45
2 IP addresses
Auto MDI/MDI-X connection

Ethernet Software Features

Industrial ProtocolsModbus TCP Client (Master), Modbus TCP Server (Slave)
Configuration OptionsWeb Console (HTTP/HTTPS), Device Search Utility (DSU), Telnet Console
ManagementARP, DHCP Client, DNS, HTTP, HTTPS, SMTP, SNMP Trap, SNMPv1/v2c/v3,
TCP/IP, Telnet, UDP, NTP Client, RADIUS
MIBRFC1213, RFC1317
Time ManagementNTP Client

Serial Interface

Console PortRS-232 (TxD, RxD, GND), 8-pin RJ45 (115200, n, 8, 1)
No. of PortsMGate MB3660-8 Series: 8
MGate MB3660-16 Series: 16
Serial StandardsRS-232/422/485 (software selectable)
ConnectorMGate MB3660-8/16: DB9 male
MGate MB3660-8/16-J: RJ45
Baudrate50 bps to 921.6 kbps
Data Bits7, 8
ParityNone, Even, Odd, Space, Mark
Stop Bits1, 2
Flow ControlRTS/CTS, DTR/DSR, RTS Toggle (RS-232 only)
RS-485 Data Direction ControlADDC® (automatic data direction control)
Pull High/Low Resistor for RS-4851 kilo-ohm, 150 kilo-ohms
Terminator for RS-485120 ohms
Isolation2 kV (I models)

Serial Signals

RS-422Tx+, Tx-, Rx+, Rx-, GND
RS-485-2wData+, Data-, GND
RS-485-4wTx+, Tx-, Rx+, Rx-, GND

Serial Software Features

Industrial ProtocolsModbus RTU/ASCII Master, Modbus RTU/ASCII Slave
Configuration OptionsSerial Console


ModeMaster, Slave
Functions Supported1, 2, 3, 4, 5, 6, 15, 16, 23
Max. No. of Commands256 per serial port
Memory Size65535 bytes

Modbus TCP

ModeClient (Master), Server (Slave)
Max. No. of Client Connections256
Max. No. of Server Connections128
Functions Supported1, 2, 3, 4, 5, 6, 15, 16, 23
Max. No. of Commands256
Memory Size65535 bytes

Modbus (Transparent)

Max. No. of Client Connections256
Max. No. of Server Connections128

Power Parameters

Input VoltageAll models: Redundant dual inputs
AC models: 100 to 240 VAC (47 to 63 Hz)
DC models: 20 to 60 VDC (1.5 kV isolation)
No. of Power Inputs2
Power ConnectorTerminal block (for DC models)
Power ConsumptionMGate MB3660-8-2AC: 144 mA @ 110 VAC
MGate MB3660-8-J-2AC: 111 mA @ 110 VAC
MGate MB3660-16-2AC: 178 mA @ 110 VAC
MGate MB3660-16-J-2AC: 133 mA @ 110 VAC
MGate MB3660I-8-2AC: 310 mA @ 110 VAC
MGate MB3660I-16-2AC: 310 mA @ 110 VAC
MGate MB3660-8-2DC: 312 mA @ 24 VDC
MGate MB3660-16-2DC: 390 mA @ 24 VDC


Contact Current RatingResistive load: 2 A @ 30 VDC

Physical Characteristics

IP RatingIP30
Dimensions (with ears)480 x 45 x 198 mm (18.90 x 1.77 x 7.80 in)
Dimensions (without ears)440 x 45 x 198 mm (17.32 x 1.77 x 7.80 in)
WeightMGate MB3660-8-2AC: 2731 g (6.02 lb)
MGate MB3660-8-2DC: 2684 g (5.92 lb)
MGate MB3660-8-J-2AC: 2600 g (5.73 lb)
MGate MB3660-16-2AC: 2830 g (6.24 lb)
MGate MB3660-16-2DC: 2780 g (6.13 lb)
MGate MB3660-16-J-2AC: 2670 g (5.89 lb)
MGate MB3660I-8-2AC: 2753 g (6.07 lb)
MGate MB3660I-16-2AC: 2820 g (6.22 lb)

Environmental Limits

Operating Temperature0 to 60°C (32 to 140°F)
Storage Temperature (package
-40 to 85°C (-40 to 185°F)
Ambient Relative Humidity5 to 95% (non-condensing)

Standards and Certifications

SafetyEN 60950-1, UL 60950-1
EMCEN 55032/24
EMICISPR 32, FCC Part 15B Class A
EMSIEC 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: 1 kV; Signal: 1 kV
IEC 61000-4-5 Surge: Power: 2 kV; Signal: 1 kV
IEC 61000-4-6 CS: 10 V
IEC 61000-4-8 PFMF
FreefallIEC 60068-2-31
ShockIEC 60068-2-27
VibrationIEC 60068-2-6, IEC 60068-2-64


TimeMGate MB3660-8-2AC: 716,647 hrs
MGate MB3660-8-2DC: 706,783 hrs
MGate MB3660-8-J-2AC: 616,505 hrs
MGate MB3660-16-2AC: 487,416 hrs
MGate MB3660-16-2DC: 482,835 hrs
MGate MB3660-16-J-2AC: 437,337 hrs
MGate MB3660I-8-2AC: 429,807 hrs
MGate MB3660I-16-2AC: 256,208 hrs
StandardsTelcordia SR332


Warranty Period5 years
DetailsSee www.moxa.com/warranty
Name Type Version Release Date
Datasheet for MGate MB3660 Series Datasheet V1.0 12 November 2018

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