Vlinx MESR424 User manual
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B&B Electronics Mfg. Co. Inc.
707 Dayton Road
Ottawa, IL 61350 USA
Phone (815) 433-5100 -- General Fax (815) 433-5105
Website: www.bb-elec.com
European Headquarters
B&B Electronics Ltd.
Westlink Commercial Park
Oranmore, Co. Galway, Ireland
Phone +353 91-792444 -- Fax +353 91-792445
Website: www.bb-europe.com
Revision Two –October 2013
2012 B&B Electronics Mfg. Co. Inc. No part of this publication may be reproduced or transmitted in any
form or by any means, electronic or mechanical, including photography, recording, or any information
storage and retrieval system without written consent. Information in this manual is subject to change
without notice, and does not represent a commitment on the part of B&B Electronics Mfg. Co. Inc.
B&B Electronics Mfg. Co. Inc. shall not be liable for incidental or consequential damages resulting from
the furnishing, performance, or use of this manual.
All brand names used in this manual are the registered trademarks of their respective owners. The use of trademarks or other designations in this
publication is for reference purposes only and does not constitute an endorsement by the trademark holder.
Table of Contents
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1. Introduction ................................................................................................................................................. 5
About MESR424 Modbus Gateways .........................................................................................................................6
MESR424 Modbus Gateway Model Numbering .......................................................................................................6
MESR 424 Features ...................................................................................................................................................7
Vlinx Manager Configuration Software ....................................................................................................................7
2. MESR424 Modbus Gateway Hardware ......................................................................................................... 8
Package Checklist......................................................................................................................................................8
MESR424 Modbus Gateway Enclosures and Mounting ............................................................................................8
LED Indicators ...........................................................................................................................................................9
E1/E2 Ethernet Link LED.......................................................................................................................................9
Ready LED.............................................................................................................................................................9
Serial Port LEDs ..................................................................................................................................................10
Mode/Reset Switch .................................................................................................................................................10
Ethernet Connector .................................................................................................................................................11
Fiber Optic Connectors............................................................................................................................................11
Serial Port Connectors.............................................................................................................................................12
Power Connector.....................................................................................................................................................13
Mounting Hardware ...............................................................................................................................................14
3. Modbus Gateway Setup and Connections .................................................................................................. 15
Connecting the Power Supply .................................................................................................................................15
Connecting MESR424 Modbus Gateways to Modbus networks .............................................................................15
Connecting the MESR424...................................................................................................................................16
Connecting MESR424 Modbus Gateways to a Network .........................................................................................17
Network Connection (10BaseT/100BaseTX) ......................................................................................................17
Fiber optic Connection .......................................................................................................................................17
MESR424 Modbus Gateway Configuration Connections ........................................................................................18
Installing Modbus Configuration Manager Software .........................................................................................18
Configuring the MESR424 Modbus Gateway via the Network Connection .......................................................22
Configuring with Modbus Configuration Manager .......................................................................................22
Configuring with the Web Interface..............................................................................................................36
Configuring the MESR424 Modbus Gateway on Networks without a DHCP Server ..........................................37
Configuring the MESR424 Modbus Gateway via the Serial Port (Console Mode) .............................................40
MESR424 Modbus Gateway Operational Connections ...........................................................................................42
Table of Contents
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Using MESR424 Modbus Gateways in Direct IP Mode ......................................................................................42
Initiating a Hardware Reset on the Modbus Gateway............................................................................................43
Reloading Factory Defaults .....................................................................................................................................43
4. Upgrading the Firmware............................................................................................................................. 44
Downloading Firmware Files...................................................................................................................................45
Uploading the Firmware to the Modbus Gateway .................................................................................................45
5. Diagnostics ................................................................................................................................................. 46
Testing a Modbus Gateway Connection .................................................................................................................46
Monitor Function ....................................................................................................................................................48
6. Application Examples ................................................................................................................................. 49
Ethernet Master and Serial Slaves ..........................................................................................................................49
Serial & Ethernet Masters, Serial & Ethernet Slaves ...............................................................................................53
Serial Masters, IP Slaves .........................................................................................................................................55
Serial Masters, IP Slaves .........................................................................................................................................58
Serial Masters, IP Slaves .........................................................................................................................................59
7. Modbus Help .............................................................................................................................................. 60
Modbus ASCII/RTU Basics .......................................................................................................................................60
Hints and Tips..........................................................................................................................................................61
8. Appendices ................................................................................................................................................. 62
Appendix A: Default Gateway Settings ...................................................................................................................63
Appendix B: Product Specifications.........................................................................................................................64
General Specifications........................................................................................................................................65
Controls, Indicators and Connector Specifications ............................................................................................66
Serial Interface Specifications ............................................................................................................................67
Network Specifications ......................................................................................................................................68
Appendix C: Dimensional Diagrams ........................................................................................................................69
Appendix D: Connector Pinouts...............................................................................................................................70
DB9 Serial Port Pinouts ......................................................................................................................................70
Terminal Block Serial Port Pinouts .....................................................................................................................71
1._Introduction
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Thank you for purchasing an MESR424 Modbus Gateway. This product has been
manufactured to the highest standards of quality and performance to ensure your
complete satisfaction.
Figure 1. MESR424 Modbus Gateways
1._Introduction
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About MESR424 Modbus Gateways
MESR424 Modbus Gatewaysconnect Modbus networks (RS-232, RS-422 or RS-485)
to Ethernet networks, allowing the Modbus network to become a node on the network.
The serial ports can be accessed over a LAN/WAN using Direct IP Mode connections.
MESR424 Modbus Gatewaysfeature 10BaseT or 100BaseTX copper network media and
fiber optic media options, depending on the model. MESR424 Modbus Gateways are
built for use in industrial environments, featuring an IP30 approved slim line DIN rail
mountable case. They operate from a range of DC power supply voltages and feature
pluggable terminal block power connectors. An external power supply, sold separately, is
required. MESR424 Modbus Gateways have an additional Ethernet port which functions
much like an Ethernet Switch.
MESR424 Modbus Gateway Model Numbering
MESR424 Modbus Gatewaysare a growing family of products. Models are available
with DB9 or Terminal Block connections. Network connection options include
10BaseT/100BaseTX copper or several different fiber optic options.
Model Number
Ethernet Port 1
Ethernet Port 1
Serial Ports
MESR424D
10/100 RJ45
10/100 RJ45
RS-232/422/485 (DB9 male)
MESR424D-MT
10/100 RJ45
Multi-mode (ST)
RS-232/422/485 (DB9 male)
MESR424D-SC
10/100 RJ45
Single-mode (SC)
RS-232/422/485 (DB9 male)
MESR424T
10/100 RJ45
10/100 RJ45
RS-232/422/485 (Terminal Block)
MESR424T-MT
10/100 RJ45
Multi-mode (ST)
RS-232/422/485 (Terminal Block)
MESR424T-SC
10/100 RJ45
Single-mode (SC)
RS-232/422/485 (Terminal Block)
1._Introduction
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MESR 424 Features
Fiber models available
Multi-interface serial ports
DB-9M and pluggable terminal block serial port connector options
All ports are software selectable as RS-232, RS-422 or RS-485 2- and 4-wire
Configuration can be done via network or direct serial connection
Slim line DIN rail mountable case
Accepts DC power over a wide voltage range
10/100 Mbps Ethernet with Auto Selection, Auto MDI/MDIX
LAN and WAN Communications
TCP Client or Server operation - configurable
Firmware Upload for future revisions/upgrades
Software Support –Windows XP (32/64 bit), 2003 Server (32/64 bit), Vista
(32/64 bit), 2008 Server (32/64 bit), Windows 7 (32/64 bit)
Configuration of Ethernet and serial port settings using Vlinx Manager software
Vlinx Manager Configuration Software
Vlinx Manager configuration software enables you to find connected Modbus gateways,
configure them, upgrade Modbus gateway firmware, and save/load configuration files. It
features a graphical user interface (GUI) that is convenient and easy to use.
2. Hardware
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MESR424 Modbus Gateways are enclosed in DIN rail mountable enclosures and feature
LED indicators, power, Ethernet and serial connectors and a recessed Mode/Reset switch.
Package Checklist
MESR424 Modbus Gateways are shipped with the following items included:
MESR424 Modbus Gateway Module
Quick Start Guide
CD with User Manual, Quick Start Guide and configuration software.
MESR424 Modbus Gateway Enclosures and Mounting
All MESR424 Modbus Gateway models are built into similar enclosures. Modules are
DIN rail and panel mountable.
Figure 2. Front View of an MESR424D Modbus Gateway
2. Hardware
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LED Indicators
MESR424 Modbus Gateways have three types of LED indicators: Ethernet Link LEDs,
a Ready LED and Serial Port LEDs.
Figure 3. Port LEDs
E1/E2 Ethernet Link LED
The Ethernet Link LED (E1 or E2) illuminates (green) if the Ethernet is connected.
When the LED is blinking it indicates that there is data traffic on the Ethernet link.
The Ethernet Speed (E1 or E2) LED is OFF if the connection is 10BaseT and ON if the
Ethernet connections is 100BaseT.
E1 is used for all models to connect to the network. E2 is a pass-through Ethernet
connector.
Ready LED
The Ready LED (green) blinks if the system is operating correctly, once per second in
normal operating conditions, or three times per second in reset, configuration mode, or
when loading factory defaults. If the LED is off or steady, it indicates the system is not
operating correctly.
2. Hardware
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Serial Port LEDs
MESR424 Modbus Gateways feature multiple serial ports. Each serial port has an
associated LED. Serial Port LEDs blink (green) when data is being transmitted or
received on the serial port.
Figure 4. Serial Port LEDs
Mode/Reset Switch
A recessed momentary Mode/Reset switch is located next to the power ports. To activate
the switch, insert a small plastic tool through the hole in the enclosure and press lightly.
Figure 5. Mode/Reset Switch
The Mode/Reset switch can be used to:
Initiate a Hardware Reset
Enter Console Mode
Reload factory defaults
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