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MGate MB3000 Modbus Gateway User Manual 5
1. Introduction
Welcome to the MGate MB3000 line of Modbus gateways. All models feature easy integration of Modbus TCP
to Modbus RTU/ASCII and feature RS-232/422/485 ports for Modbus serial communication. One, two, and
four-port models are available.
This user’s manual applies to the following models:
• MGate MB3180
•
MGate MB3280
•
MGate MB3480
• MGate MB3170/3170I
•
MGate MB3270/3270I
Overview
The MGate MB3000 is a line of Modbus protocol gateways that provides users with
•
seamless integration of Ethernet and serial Modbus devices
• powerful operation modes to handle almost any Modbus application
•
Windows utilities for easy setup and traffic monitoring
Seamless integration of Ethernet and serial Modbus devices
Modbus is one of the most popular automation protocols in the world, supporting traditional RS-
232/422/485 devices and recently developed Ethernet devices. Many industrial devices, such as PLCs,
DCSs, HMIs, instruments, and meters, use Modbus as their communication standard. However, the
Ethernet-based Modbus protocol is so different from the original serial-based protocols that a
communication gateway is needed as a bridge for integration.
In order to integrate Modbus networks, the MGate MB3000 includes an Ethernet port and up to four serial
ports that support RS-232, RS-422, and RS-485 communication. It automatically and intelligently translates
between Modbus TCP (Ethernet) and Modbus ASCII/RTU (serial) protocols, allowing Ethernet-based PLCs to
control instruments over RS-485 without additional programming or effort.
Powerful operation modes to handle almost any Modbus application
With the Modbus protocol, devices must be clearly defined as either masters or slaves. Unlike other Modbus
gateways, the MGate MB3000’s operation modes allow users to select master or slave operation for each
serial port. Not only does the MB3000 allow Ethernet masters to control serial slaves, it also allows serial
masters to control Ethernet slaves. In addition, the advanced models (the MGate MB3170 and MB3270
Series) allow both Ethernet and serial slaves to be controlled by both Ethernet and serial masters. On
multiport models, each serial port’s operation mode is independent of the other ports, so that one port may
be configured for slave mode and another port configured for master mode.
Extra address mapping and exception parameters are provided to ensure that most situations can be
handled.
Web console and Windows utilities for easy setup and traffic monitoring
A Windows utility is provided to make configuration and operation of the MGate MB3000 as easy as possible.
The utility automatically connects to all available MGate MB3000 units on the LAN for you. Traffic monitoring
functions help you troubleshoot Modbus communication problems by tracking items such as connection
status and address translation errors. All series provide a web console for configuration.