AutomationDirect MB-GATEWAY Instructions for use

Manual Number: MB-GATEWAY-USER-M
MB-GATEWAY
Hardware User Manual

~ WARNING ~
Thank you for purchasing automation equipment from Automationdirect.com®, doing business as,
AutomationDirect. We want your new automation equipment to operate safely. Anyone who installs or
uses this equipment should read this publication (and any other relevant publications) before installing or
operating the equipment.
To minimize the risk of potential safety problems, you should follow all applicable local and national
codes that regulate the installation and operation of your equipment. These codes vary from area to area
and usually change with time. It is your responsibility to determine which codes should be followed, and
to verify that the equipment, installation, and operation is in compliance with the latest revision of these
codes.
At a minimum, you should follow all applicable sections of the National Fire Code, National Electrical
Code, and the codes of the National Electrical Manufacturer’s Association (NEMA). There may be local
regulatory or government offices that can also help determine which codes and standards are necessary for
safe installation and operation.
Equipment damage or serious injury to personnel can result from the failure to follow all applicable
codes and standards. We do not guarantee the products described in this publication are suitable for
your particular application, nor do we assume any responsibility for your product design, installation, or
operation.
Our products are not fault-tolerant and are not designed, manufactured or intended for use or resale as
on-line control equipment in hazardous environments requiring fail-safe performance, such as in the
operation of nuclear facilities, aircraft navigation or communication systems, air traffic control, direct life
support machines, or weapons systems, in which the failure of the product could lead directly to death,
personal injury, or severe physical or environmental damage (“High Risk Activities”). AutomationDirect
specifically disclaims any expressed or implied warranty of fitness for High Risk Activities.
For additional warranty and safety information, see the Terms and Conditions section of our catalog.
If you have any questions concerning the installation or operation of this equipment, or if you need
additional information, please call us at 770-844-4200.
This publication is based on information that was available at the time it was printed. At
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make changes to the products and/or publications at any time without notice and without any obligation.
This publication may also discuss features that may not be available in certain revisions of the product.
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Copyright 2011-2020, Automationdirect.com®Incorporated
All Rights Reserved
No part of this manual shall be copied, reproduced, or transmitted in any way without the prior, written
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information included in this document.

~ ADVERTENCIA ~
Gracias por comprar equipo de automatización de Automationdirect.com®. Deseamos que su nuevo equipo
de automatización opere de manera segura. Cualquier persona que instale o use este equipo debe leer esta
publicación (y cualquier otra publicación pertinente) antes de instalar u operar el equipo.
Para reducir al mínimo el riesgo debido a problemas de seguridad, debe seguir todos los códigos de seguridad
locales o nacionales aplicables que regulan la instalación y operación de su equipo. Estos códigos varian de
área en área y usualmente cambian con el tiempo. Es su responsabilidad determinar cuales códigos deben ser
seguidos y verificar que el equipo, instalación y operación estén en cumplimiento con la revisión mas reciente
de estos códigos.
Como mínimo, debe seguir las secciones aplicables del Código Nacional de Incendio, Código Nacional Eléctrico,
y los códigos de (NEMA) la Asociación Nacional de Fabricantes Eléctricos de USA. Puede haber oficinas de
normas locales o del gobierno que pueden ayudar a determinar cuales códigos y normas son necesarios para una
instalación y operación segura.
Si no se siguen todos los códigos y normas aplicables, puede resultar en daños al equipo o lesiones serias a
personas. No garantizamos los productos descritos en esta publicación para ser adecuados para su aplicación
en particular, ni asumimos ninguna responsabilidad por el diseño de su producto, la instalación u operación.
Nuestros productos no son tolerantes a fallas y no han sido diseñados, fabricados o intencionados para uso
o reventa como equipo de control en línea en ambientes peligrosos que requieren una ejecución sin fallas,
tales como operación en instalaciones nucleares, sistemas de navegación aérea, o de comunicación, control de
tráfico aéreo, máquinas de soporte de vida o sistemas de armamentos en las cuales la falla del producto puede
resultar directamente en muerte, heridas personales, o daños físicos o ambientales severos (“Actividades de Alto
Riesgo”). Automationdirect.com específicamente rechaza cualquier garantía ya sea expresada o implicada para
actividades de alto riesgo.
Para información adicional acerca de garantía e información de seguridad, vea la sección de Términos y
Condiciones de nuestro catálogo. Si tiene alguna pregunta sobre instalación u operación de este equipo, o
si necesita información adicional, por favor llámenos al número 770-844-4200 en Estados Unidos.
Esta publicación está basada en la información disponible al momento de impresión. En Automationdirect.
com nos esforzamos constantemente para mejorar nuestros productos y servicios, así que nos reservamos el
derecho de hacer cambios al producto y/o a las publicaciones en cualquier momento sin notificación y sin
ninguna obligación. Esta publicación también puede discutir características que no estén disponibles en ciertas
revisiones del producto.
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PROPIEDAD LITERARIA 2011-2020, AUTOMATIONDIRECT.COM®INCORPORATED
Todos los derechos reservados
No se permite copiar, reproducir, o transmitir de ninguna forma ninguna parte de este manual sin previo consentimiento
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instalar, configurar y mantener el equipo correspondiente. También las instituciones de enseñanza pueden usar este manual
para propósitos educativos.

~ AVERTISSEMENT ~
Nous vous remercions d’avoir acheté l’équipement d’automatisation de Automationdirect.com®, en faisant des
affaires comme, AutomationDirect. Nous tenons à ce que votre nouvel équipement d’automatisation fonctionne en
toute sécurité. Toute personne qui installe ou utilise cet équipement doit lire la présente publication (et toutes les
autres publications pertinentes) avant de l’installer ou de l’utiliser.
Afin de réduire au minimum le risque d’éventuels problèmes de sécurité, vous devez respecter tous les codes locaux
et nationaux applicables régissant l’installation et le fonctionnement de votre équipement. Ces codes diffèrent d’une
région à l’autre et, habituellement, évoluent au fil du temps. Il vous incombe de déterminer les codes à respecter et
de vous assurer que l’équipement, l’installation et le fonctionnement sont conformes aux exigences de la version la
plus récente de ces codes.
Vous devez, à tout le moins, respecter toutes les sections applicables du Code national de prévention des incendies,
du Code national de l’électricité et des codes de la National Electrical Manufacturer’s Association (NEMA). Des
organismes de réglementation ou des services gouvernementaux locaux peuvent également vous aider à déterminer
les codes ainsi que les normes à respecter pour assurer une installation et un fonctionnement sûrs.
L’omission de respecter la totalité des codes et des normes applicables peut entraîner des dommages à l’équipement
ou causer de graves blessures au personnel. Nous ne garantissons pas que les produits décrits dans cette publication
conviennent à votre application particulière et nous n’assumons aucune responsabilité à l’égard de la conception, de
l’installation ou du fonctionnement de votre produit.
Nos produits ne sont pas insensibles aux défaillances et ne sont ni conçus ni fabriqués pour l’utilisation ou la revente
en tant qu’équipement de commande en ligne dans des environnements dangereux nécessitant une sécurité absolue,
par exemple, l’exploitation d’installations nucléaires, les systèmes de navigation aérienne ou de communication, le
contrôle de la circulation aérienne, les équipements de survie ou les systèmes d’armes, pour lesquels la défaillance du
produit peut provoquer la mort, des blessures corporelles ou de graves dommages matériels ou environnementaux
(«activités à risque élevé»). La société AutomationDirect nie toute garantie expresse ou implicite d’aptitude à
l’emploi en ce qui a trait aux activités à risque élevé.
Pour des renseignements additionnels touchant la garantie et la sécurité, veuillez consulter la section Modalités et
conditions de notre documentation. Si vous avez des questions au sujet de l’installation ou du fonctionnement de cet
équipement, ou encore si vous avez besoin de renseignements supplémentaires, n’hésitez pas à nous téléphoner au
770-844-4200.
Cette publication s’appuie sur l’information qui était disponible au moment de l’impression. À la société
AutomationDirect, nous nous efforçons constamment d’améliorer nos produits et services. C’est pourquoi nous
nous réservons le droit d’apporter des modifications aux produits ou aux publications en tout temps, sans préavis ni
quelque obligation que ce soit. La présente publication peut aussi porter sur des caractéristiques susceptibles de ne
pas être offertes dans certaines versions révisées du produit.
Marques de commerce
La présente publication peut contenir des références à des produits fabriqués ou offerts par d’autres entreprises. Les
désignations des produits et des entreprises peuvent être des marques de commerce et appartiennent exclusivement à
leurs propriétaires respectifs. AutomationDirect nie tout intérêt dans les autres marques et désignations.
Copyright 2011-2020, Automationdirect.com®Incorporated
Tous droits réservés
Nulle partie de ce manuel ne doit être copiée, reproduite ou transmise de quelque façon que ce soit sans le
consentement préalable écrit de la société Automationdirect.com®Incorporated. AutomationDirect conserve les
droits exclusifs à l’égard de tous les renseignements contenus dans le présent document.

MB-GATEWAY
HARDWARE USER MANUAL
Please include the Manual Number and the Manual Issue, both shown below,
when communicating with Technical Support regarding this publication.
Manual Number: MB-GATEWAY-USER-M
Issue: 1st Edition Rev. G
Issue Date: 02/2020
Publication History
Issue Date Description of Changes
1st Edition 06/11 Original issue
Rev. A 01/12 Added Example 4 to Appendix
Rev. B 07/12 Added IP address reset note.
Rev. C 10/13 Added Autodetection notes. Added TCP to RTU diagrams.
Rev. D 02/16 Revised product photo
Rev E 09/17 Several minor revisions
Rev F 10/18 Minor revision to Appendix A, Application Examples
Rev G 02/2020 Added Appendix C, Security Considerations for Control Systems Networks

Table of ConTenTs
Chapter 1: Getting Started
Introduction..................................................................................................................1-2
Overview of this Publication����������������������������������������������������������������������������������������1-2
Who Should Read This Manual������������������������������������������������������������������������������������ 1-3
Technical Support ������������������������������������������������������������������������������������������������������� 1-3
Conventions Used.........................................................................................................1-4
Key Topics for Each Chapter �������������������������������������������������������������������������������������� 1-4
Product Overview ......................................................................................................... 1-5
What’s in the Box .........................................................................................................1-6
Mounting / Clearance Information..............................................................................1-6
Direct Mounting����������������������������������������������������������������������������������������������������������1-6
DIN Rail Mounting ������������������������������������������������������������������������������������������������������1-7
Agency Approvals ......................................................................................................... 1-7
Chapter 2: Specifications
Specifications ................................................................................................................2-2
LED Indicators...............................................................................................................2-3
STA �����������������������������������������������������������������������������������������������������������������������������2-3
SPD �����������������������������������������������������������������������������������������������������������������������������2-3
TXD�����������������������������������������������������������������������������������������������������������������������������2-3
ERR������������������������������������������������������������������������������������������������������������������������������2-3
LK/A ����������������������������������������������������������������������������������������������������������������������������2-4
RXD�����������������������������������������������������������������������������������������������������������������������������2-4
Dip Switch Information ................................................................................................2-5
Dimensional Drawing ................................................................................................... 2-6
Inches [mm]���������������������������������������������������������������������������������������������������������������� 2-6

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Chapter 3: Installation, Wiring and Configuration
Safety Guidelines ........................................................................................................ 3-2
Plan for Safety ����������������������������������������������������������������������������������������������������������� 3-2
Security Considerations ��������������������������������������������������������������������������������������������� 3-2
Wiring Diagrams......................................................................................................... 3-3
MB-GATEWAY Configuration..................................................................................... 3-4
NetEdit Configuration ����������������������������������������������������������������������������������������������� 3-5
Function Codes Supported���������������������������������������������������������������������������������������� 3-6
Log Modbus/TCP and/or RTU requests to SMTPViewer��������������������������������������������� 3-6
Chapter 4: Parameters
Home Page ................................................................................................................. 4-2
Gateway Modbus ID................................................................................................... 4-3
Module Name and Module Description .................................................................... 4-4
IP Setup Configuration Page...................................................................................... 4-5
Serial Port Configuration Page .................................................................................. 4-6
Set Up Slave Timeout / Retries Page ......................................................................... 4-7
Gateway Device Status Page...................................................................................... 4-8
1 Automatic Reads��������������������������������������������������������������������������������������������������� 4-9
2 Last Modbus TCP Request ������������������������������������������������������������������������������������ 4-9
3 Last Modbus RTU Request ���������������������������������������������������������������������������������� 4-10
4 Status Information ���������������������������������������������������������������������������������������������� 4-10
Setup Automatic Read Page ������������������������������������������������������������������������������������ 4-10
Firmware Updates .................................................................................................... 4-11
Chapter 5: Automatic Read Feature
Automatic Read Feature............................................................................................. 5-2
Situation 1:���������������������������������������������������������������������������������������������������������������� 5-3
Situation 2:���������������������������������������������������������������������������������������������������������������� 5-6
Additional Optimization............................................................................................. 5-8
Automatic Read Status Data �������������������������������������������������������������������������������������� 5-9

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Appendix A: Application Examples
Example 1:
Using Modbus Poll to MB-GATEWAY with DL06 Slave............................................. A-2
Items needed for this example: ��������������������������������������������������������������������������������� A-2
Step 1: Connect the MB-GATEWAY serial port to the DL06 secondary communications
port��������������������������������������������������������������������������������������������������������������� A-2
Step 2: Configure the DL06 PLC serial port and MB-GATEWAY serial port� ��������������� A-3
Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator software� ���� A-7
Example 2:
Using Modbus Poll to MB-GATEWAY with CLICK Slave ......................................... A-11
Items needed for this example: ������������������������������������������������������������������������������� A-11
Step 1: Connect the MB-GATEWAY serial port to Port 3 of the CLICK PLC�������������� A-11
Step 2: Configure the CLICK serial port and MB-GATEWAY serial port� ������������������� A-12
Step 3: Connect to the MB-GATEWAY using the Modbus Poll simulator software� �� A-18
Example 3:
Using P3000 as Master (Client) to MB-GATEWAY with CLICK Slave. .................... A-24
Step 1: Connect CLICK to the MB-GATEWAY as shown in example 2� �������������������� A-24
Step 2: Connect P3000 CPU (P3-550) to MB-GATEWAY via Ethernet Switch and Two
Ethernet Cables� ������������������������������������������������������������������������������������������ A-24
Step 3: Configure the MRX instruction to read data from the MB-GATEWAY� ��������� A-28
Example 4:
DirectLogic 06 (H0-ECOM100) as Master (Client) to
MB-GATEWAY with Mulitple GS Drives as Slaves. .................................................. A-29
Step 1: Set up Peer to Peer Configuration ��������������������������������������������������������������� A-30
Step 2: Set the Serial Port Configuration ����������������������������������������������������������������� A-31
Step 3: Set the Communication Parameters ������������������������������������������������������������ A-31
Step 4: Using Automatic Reads�������������������������������������������������������������������������������� A-32
Step 5: Access the Automatic Read Data ����������������������������������������������������������������� A-33
Step 6: Read and Write from the DL06 ������������������������������������������������������������������� A-36
Appendix B: Modbus Error Codes
Modbus Error Codes................................................................................................... B-2
Appendix C: Security Considerations for Control Systems Networks
Security Considerations for Control Systems Networks............................................ C-2
Index

1
1
1
GeTTinG sTarTed
Chapter
Chapter
Chapter
In this Chapter...
Introduction...................................................................................................................1-2
Overview of this Publication�����������������������������������������������������������������������������������������1-2
Who Should Read This Manual�������������������������������������������������������������������������������������1-3
Technical Support ��������������������������������������������������������������������������������������������������������1-3
Conventions Used..........................................................................................................1-4
Key Topics for Each Chapter ���������������������������������������������������������������������������������������1-4
Product Overview ..........................................................................................................1-5
What’s in the Box ..........................................................................................................1-6
Mounting / Clearance Information...............................................................................1-6
Direct Mounting�����������������������������������������������������������������������������������������������������������1-6
DIN Rail Mounting �������������������������������������������������������������������������������������������������������1-7
Agency Approvals ..........................................................................................................1-7

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Introduction
Overview of this Publication
Modbus is one of the most popular communication protocols in the automation industry
because it supports both traditional RS-232/422/485 devices and newly developed industrial
Ethernet devices. Many industrial devices, such as PLCs, HMIs, instruments and meters
use Modbus as their standard communication protocol. However, the Modbus protocols
running over serial and Ethernet are so different that a communication gateway is needed as
a bridge for integrating devices from these two networks. The MB-GATEWAY is a Modbus
TCP (Ethernet) to Modbus RTU (Serial) Gateway which provides the necessary bridge to
connect Modbus RTU (Serial) products to Ethernet LANs.
The Modbus TCP side of the Gateway functions as a TCP Server (slave) while the Modbus
RTU side functions as a serial Client (master). The serial side physical interface is
RS-422/485 2 or 4 wire so up to 128 Modbus RTU devices can be accessed by a Modbus
TCP Client device (up to 12 simultaneous connections). The actual number of Modbus
RTU slaves will depend on their individual transceiver loads.
MB-GATEWAY
Serial
RS-485
Ethernet
Modbus
RTU slave
device 1
Modbus
TCP Client
device
Gateway Modbus
Address = 255
Modbus
RTU slave
device 5
Other
devices
MB-GATEWAY
Server
Master
TCPRTU
Modbus Query
Modbus Response
Modbus Response
Modbus Query
Client
Slave
The MB-GATEWAY User Manual describes the installation, configuration, and methods of
operation of the MB-GATEWAY Module.

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Who Should Read This Manual
This manual contains important information for those who will install, maintain, and/or
operate The MB-GATEWAY Module.
Technical Support
We strive to make our manuals the best in the industry. We rely on your feedback to let us
know if we are reaching our goal. If you cannot find the solution to your particular application,
or, if for any reason you need technical assistance, please call us at:
770–844–4200
Our technical support group will work with you to answer your questions. They are available
Monday through Friday from 9:00 A.M. to 6:00 P.M. Eastern Time. We also encourage you
to visit our web site where you can find technical and non-technical information about our
products and our company.
http://www.automationdirect.com

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Conventions Used
When you see the “notepad” icon in the left-hand margin, the paragraph to its immediate right will be a special
note. The word NOTE: in boldface will mark the beginning of the text.
Key Topics for Each Chapter
The beginning of each chapter will list the key topics that can be found in that chapter.
Getting Started
CHAPTER
1
In This Chapter...
.................................................................1-2
...........................................................................1-4Specifications
General Information
When you see the “exclamation mark” icon in the left-hand margin, the paragraph to its immediate
right will be a warning. This information could prevent injury, loss of property, or even death (in
extreme cases). The word WARNING: in boldface will mark the beginning of the text.

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Product Overview
AutomationDirect’s MB-GATEWAY is a single port Modbus Gateway module that converts
Modbus TCP to Modbus RTU. It supports up to 12 simultaneous Modbus TCP Client
(master) Ethernet connections, and up to 128 RTU Server (slave) Serial connections.
MB-GATEWAY requires 10VDC to 36VDC from an external power supply. Each module
has one RJ45 10/100 Mbps Ethernet port and one RS-422/485 2 or 4 wire Serial Port. It
supports NetEdit (Ver 3.8 and later) or Web Browser based configuration tools.
Key features include:
• Automatic Read Function
• RJ45 10/100 Mbps Ethernet Port
• RS-422/485 2 or 4 wire Serial Port
• Supports NetEdit and Web Browser configuration tools
• Autodetects Ethernet cable types (MDI/MDX)
• 35mm DIN rail mount

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What’s in the Box
DIN Rail Mounting
Adapter
MB-GATEWAY
Mounting / Clearance Information
There are two options for mounting the MB-GATEWAY module.
Direct Mounting
The MB-GATEWAY module can be mounted in either a low-profile orientation or a slim-
mount orientation using screw holes on the provided mounting adapter. Screws are not
provided
Baud Rate
2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200
Parity
4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd
Stop Bits
5 - Switch
0 = 1 Bit
1 = 2 Bits
6 - Reset IP Cfg
7 - Reserved

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DIN Rail Mounting
The MB-GATEWAY module can be snapped onto a standard 35 mm x 7.5 mm height DIN
rail (Standard: CENELEC EN50022). They can be mounted either vertically or horizontally.
Refer to the mechanical drawings that follow for proper mounting.
DIN rail mounting steps:
1. Hook bottom back of unit over the DIN rail.
2. Push top back onto the DIN rail until it snaps into place.
DIN rail removal steps:
A. Pull up on tab at the top of the mounting adapter with a screwdriver.
B. Rotate the bottom of the unit away from the DIN rail.
C. Pull unit down and away from DIN rail.
Mounting
1
2A
B
Removal
C
Baud Rate
2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200
Parity
4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd
Stop Bits
5 - Switch
0 = 1 Bit
1 = 2 Bits
6 - Reset IP Cfg
7 - Reserved
Baud Rate
2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200
Parity
4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd
Stop Bits
5 - Switch
0 = 1 Bit
1 = 2 Bits
6 - Reset IP Cfg
7 - Reserved
Agency Approvals
UL/CUL/CE Certification Numbers
Name UL/CUL UL508 CE
MB-GATEWAY E185989 E185989 Yes
UL
CUS
R

speCifiCaTions 2
2
2
Chapter
Chapter
Chapter
In this Chapter...
Specifications .................................................................................................................2-2
LED Indicators................................................................................................................2-3
Dip Switch Information .................................................................................................2-4
Dimensional Drawing ....................................................................................................2-5

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Specifications
Specifications
Ethernet
Interface
Port RJ-45
Speed 10/100 Mbps
Protection Built-in 1.5 KV magnetic isolation
Protocol Supported Modbus TCP/IP Server (Slave)
Clients (Masters)
Supported 12 simultaneous Modbus TCP connections
Cable Type Autodetects Ethernet cable types (MDI/MDX)
Serial
Interface
Port 6-position terminal strip (Phoenix #1863194) provided
Supported Signal Lines RS-422 (5-wire) Signals: TX+, TX-, RX-, RX+, GND
RS-485 (3-wire) Signals: Data+, Data -, GND
Supported Baud Rates
300*, 600*, 1200*, 2400, 4800, 9600,
14.4k, 19.2k, 38.4k, 57.6k, 115.2k
* Cannot be set with DIP switches.
Must be set via web browser configuration.
Parity Odd, Even, None
Data Bits 8
Stop Bits 1, 2
Protocol Supported Modbus RTU Client (Master)
Servers (Slaves)
Supported 128
Termination Permanently installed 120ΩΩresistor between
Data+ and Data -
Power Consumption
2W
Use Class 2 power supply
Use conductors rated 60/75 °C
3-position terminal strip (Phoenix #1863165) provided
Wire Range 16 - 28 AWG Solid or Stranded Conductor (1.5 mm2)
Wire Strip Length 0.24 - 0.27 in (6 - 7 mm)
Screw Torque 1.7 lb-in (0.2 Nm)
Operating Temperature Range 0 to 60 °C (32 to 140 °F)
Storage Temperature Range -20 to 70 °C (-4 to 158 °F)
Humidity 5 to 95% RH (non-condensing)
Environmental Air For use in Pollution Degree 2 Environment. No corrosive gases
Vibration MIL STD 810C 514.2
Shock MIL STD 810C 516.2
Weight 0.2 lbs (0.09 kg)

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LED Indicators
STA
The STA or STATUS LED is steady ON when the MB-GATEWAY has passed power-up
diagnostics and is ready for use.
SPD
The SPD or SPEED LED is used to represent the Ethernet speed. The LED will be ON
when the Ethernet speed is 100Mbps and OFF when the speed is 10Mbps.
TXD
The TXD or TRANSMIT DATA LED flashes to indicate that the MB-GATEWAY is
sending data through the serial port.
ERR
If the MB-GATEWAY’s ERR (ERROR) indicator is:
• ON - a critical error has occurred. The error may be in the card itself, or the result of a network
problem. The ERROR indication can be caused by a faulty ground, an electrical spike or other
types of electrical disturbances. Cycle power to the system to attempt clearing the error.
• Flashing once per second - a firmware update is in progress.
• Flashing randomly - a Modbus/RTU error. This could be a timeout or an actual error response.
Check the Gateway Device Status page on the MB-GATEWAY configuration web page to see the
quantity of Request Errors and the description of the Last Request Error.
A CRC error for an Automatic Reads table entry will flash the ERRor LED and set the Last
Request Error to: MODBUS_ERROR_MEMORY_PARITY_ERROR.
For a direct request from a Modbus TCP server, a Modbus RTU parity error will return the
error MODBUS_ERROR_MEMORY_PARITY_ERROR to the Modbus TCP server.

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LK/A
The LK/A or LINK GOOD/ACTIVITY LED flashes to indicate that the card sees data
traveling on the Ethernet network. If any network device is sending or receiving data, the
LK/A LED will be flashing. During heavy communication loads, this indicator will be steady
ON. If the LED is OFF, then a problem with the Ethernet connection has been detected.
RXD
The RXD or RECEIVE DATA LED flashes to indicate that the MB-GATEWAY is receiving
data through the serial port.

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Dip Switch Information
S7
S6
S5
S4
S3
S2
S1
S0
OFF
ON
+ INPUT
10-36 VDC
+V
TXD+
TXD-
RXD-
RXD+
GND
COM
GND
Chasis
MB-GATEWAY
MODBUS TCP/IP to MODBUS RTU
S7
S6
S5
S4
S3
S2
S1
S0
OFF
ON
Baud Rate
2 1 0 - Switch
0 0 0 = SW cfg
0 0 1 = 4800
0 1 0 = 9600
0 1 1 = 14400
1 0 0 = 19200
1 0 1 = 38400
1 1 0 = 57600
1 1 1 = 115200
Parity
4 3 - Switch
0 0 = None
0 1 = Odd
1 0 = Even
1 1 = Resvd
Stop Bits
5 - Switch
0 = 1 Bit
1 = 2 Bits
6 - Reset IP Cfg
7 - Reserved
S7 S6 S5 S4 S3 S2 S1 S0 Switch seng
000Soware Config
001 4800
010 9600
011 14400
100 19200
101 38400
110 57600
111 115200
00 None
01 Odd
10 Even
11 Reserved
01
Bit
12
Bits
Baud Rate Parity Stop
Bits
Reserved
1
S7 reserved
Reset
IP
*
* Seng S6 to on will, on power cycle, set the IP address, subnet mask
and gateway address in the MB-GATEWAY to 0.0.0.0
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