- 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)
- Supports redundant dual DC power inputs and 1 relay output
- DNV, ATEX, Class 1 Div 2 Certified for hazardous environments 

Introduction

Moxa MGate MB3270 is an advanced 2-port Modbus gateway. It 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. MGate 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.

1. 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.

2. Auto-Device Routing for Easy Configuration
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.

3. Priority Control for Urgent Commands
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.