Moxa Technologies Mgate MB3660, MGate MB366-8, MGate MB3660-16 User Manual

MGate MB3660 Modbus Gateway

User’s Manual

Edition 2.0, June 2017

www.moxa.com/product

© 2017 Moxa Inc. All rights reserved.

MGate MB3660 Modbus Gateway

User’s Manual

The software described in this manual is furnished under a license agreement and may be used only in accordance with

the terms of that agreement.

Copyright Notice

© 2017 Moxa Inc. All rights reserved.

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The MOXA logo is a registered trademark of Moxa Inc.

All other trademarks or registered marks in this manual belong to their respective manufacturers.

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Information in this document is subject to change without notice and does not represent a commitment on the part of

Moxa.

Moxa provides this document as is, without warranty of any kind, either expressed or implied, including, but not limited

to, its particular purpose. Moxa reserves the right to make improvements and/or changes to this manual, or to the

products and/or the programs described in this manual, at any time.

Information provided in this manual is intended to be accurate and reliable. However, Moxa assumes no responsibility for

its use, or for any infringements on the rights of third parties that may result from its use.

This product might include unintentional technical or typographical errors. Changes are periodically made to the

information herein to correct such errors, and these changes are incorporated into new editions of the publication.

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Table of Contents

1. Introduction ...................................................................................................................................... 1-1

Overview ........................................................................................................................................... 1-2

Package Checklist ............................................................................................................................... 1-3

Product Features ................................................................................................................................ 1-3

2. Getting Started.................................................................................................................................. 2-1

Connecting the Power ......................................................................................................................... 2-2

Connecting Serial Devices .................................................................................................................... 2-2

RS-485 Termination and Pull High/Low Resistors ............................................................................. 2-2

Connecting to a Host or the Network ............................................................................................. 2-3

Installing the Software ................................................................................................................. 2-3

Wiring Requirements ........................................................................................................................... 2-3

LED Indicators .................................................................................................................................... 2-4

Dimensions ........................................................................................................................................ 2-4

Adjustable Pull High/Low Resistors for the RS-485 Port ........................................................................... 2-5

Pin Assignments ................................................................................................................................. 2-5

Power Input (DC Model) ...................................................................................................................... 2-6

Relay Output .............................................................................................................................. 2-6

Rackmount ........................................................................................................................................ 2-6

Specifications ..................................................................................................................................... 2-7

3. Device Search Utility ......................................................................................................................... 3-1

Installing the Software ........................................................................................................................ 3-2

Starting Device Search Utility (DSU) ..................................................................................................... 3-5

Connecting to the Unit ......................................................................................................................... 3-5

Broadcast Search ........................................................................................................................ 3-6

Search IP ................................................................................................................................... 3-8

Locate ........................................................................................................................................ 3-8

Upgrading the Firmware ...................................................................................................................... 3-9

4. Web Console Configuration ............................................................................................................... 4-1

Overview ........................................................................................................................................... 4-2

Basic Settings .................................................................................................................................... 4-2

Network Settings ................................................................................................................................ 4-3

Serial Settings .................................................................................................................................... 4-4

RTS Delay .................................................................................................................................. 4-4

Protocol Settings ................................................................................................................................ 4-5

Transparent Mode ....................................................................................................................... 4-6

Agent mode .............................................................................................................................. 4-16

System Management ................................................................................................................. 4-31

System Monitoring .................................................................................................................... 4-36

Save/Restart .................................................................................................................................... 4-38

Logout............................................................................................................................................. 4-38

MXView ........................................................................................................................................... 4-38

MXconfig ......................................................................................................................................... 4-38

5. Typical Applications .......................................................................................................................... 5-1

Ethernet Masters with Multiple Serial Slaves ........................................................................................... 5-2

Serial Masters with Multiple Ethernet Slaves ........................................................................................... 5-2

Modbus TCP Masters with ASCII and RTU Slaves .................................................................................... 5-3

Serial Master(s) with Serial Slaves ........................................................................................................ 5-3

6. Case Studies ...................................................................................................................................... 6-1

Introduction ....................................................................................................................................... 6-2

Replace Serial Masters with Ethernet Master(s), Configurable Slave IDs .................................................... 6-2

Replace Serial Masters with Ethernet Master(s), Fixed Slave IDs ............................................................... 6-3

Keep Serial Master and Add Ethernet Master(s) ...................................................................................... 6-3

Integrate Modbus RTU, ASCII, and TCP at the Same Time ....................................................................... 6-4

A. Modbus Overview .............................................................................................................................. A-1

Introduction ....................................................................................................................................... A-1

Devices are Either Masters or Slaves ..................................................................................................... A-1

Slaves are Identified by ID ................................................................................................................... A-1

Communication is by Request and Response .......................................................................................... A-1

Requests Need a Time Limit ................................................................................................................. A-2

Modbus Ethernet vs. Modbus Serial ....................................................................................................... A-3

Integrate Modbus Serial and Ethernet with Gateways .............................................................................. A-3

1

1. Introduction

Welcome to the MGate MB3660 Series of 8 or 16-port Modbus gateways that convert between Modbus TCP and

Modbus RTU/ASCII protocols.

All MB3660 gateways (MB3660-8, MB3660-16) have dual AC/DC power inputs and dual IP addresses built in for

redundancy. Magnetic serial port isolation is also provided for “-I” models.

In this chapter, we give an introduction to the MGate MB3660. The following topics are covered:



Overview



Package Checklist



Product Features

MGate MB3660 Modbus Gateway Introduction

1-2

Overview

The MGate MB3660 (MB3660-8 and MB3660-16) Series comprises redundant Modbus gateways that convert

between Modbus TCP and Modbus RTU/ASCII protocols. They can be accessed by up to 256 Modbus TCP client

(master) devices, or connect to 128 Modbus TCP server (slave) 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.

Agent mode is designed to overcome this performance weakness. By allowing users to manually key in Modbus

commands, the gateway can send Modbus commands to multiple Modbus devices at the same time. Since the

gateway actively and continuously retrieves data from Modbus devices simultaneously through the different

serial ports, users will see a dramatic reduction in the amount of time a Modbus device needs to wait to be

accessed. SCADA systems can retrieve Modbus device data directly from the gateway’s memory, instead of

waiting for the gateway to pass commands to the serial ports, enhancing the Modbus gateway’s communication

performance.

Transparent mode helps users adopt existing SCADA programs, but with reduced communication performance,

whereas agent mode is characterized by high performance, but it requires users to go through the trouble of

keying in Modbus commands. In order to provide better performance, without requiring users to key in a lot of

Modbus commands, 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 memorize 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.

Windows-Based Utility and Web Console for Easy Setup

A Windows-based utility is provided to make it easy to search for and locate devices, assign IP addresses,

import/export configuration files, and upgrade the the MGate MB3660’s firmware. The utility automatically

connects to all available MGate MB3660 units on the LAN. A user-friendly web console is provided to configure

the device from a web browser.

MGate MB3660 Modbus Gateway Introduction

1-3

Package Checklist

All models in the MGate MB3660 Series are shipped with the following items:

Standard Accessories

• 1 MGate MB3660 Modbus gateway

• 1 8-pin RJ45-to-DB9 female serial cable for console setting

• 2 L-shaped brackets for wall mounting

• 2 AC power cord (for AC models)

• Documentation & software CD

• Quick installation guide (printed)

• Warranty card

Optional Accessories

• Mini DB9F-to-TB Adapter: DB9 female to terminal block adapter for RS-422/485 applications

• CBL-RJ45M9-150: 8-pin RJ45 to DB9 male cable, 150 cm

• CBL-RJ45F9-150: 8-pin RJ45 to DB9 female cable, 150 cm

NOTE

Notify your sales representative if any of the above items

are missing or damaged.

Product Features

• Innovative Command Learning eliminates the need to key-in SCADA Modbus commands (acts as an agent

gateway)

• Auto device routing (patent pending)

• High performance through active and parallel polling of serial devices

• Supports serial (Master) to serial (Slave) communication

• 2 Ethernet ports with the same IP or dual IP addresses

• SD card for configuration backup

• Access by up to 256 Modbus TCP client (master) devices, or connect to 128 Modbus TCP server (slave)

devices

• Dual VDC or VAC power inputs with wide power input range

• 3-pin fault relay circuit for event alarms

• 2 kV isolation protection (for “-I” models)

2

2. Getting Started

This chapter provides basic instructions for installing the MGate MB3660.

The following topics are covered in this chapter:



Connecting the Power



Connecting Serial Devices

 RS-485 Termination and Pull High/Low Resistors

 Connecting to a Host or the Network

 Installing the Software



Wiring Requirements



LED Indicators



Dimensions



Adjustable Pull High/Low Resistors for the RS-485 Port



Pin Assignments



Power Input (DC Model)

 Relay Output



Rackmount



Specifications

MGate MB3660 Modbus Gateway Getting Started

2-2

Connecting the Power

The unit can be powered by connecting a power source to the terminal block for DC models or power connector

for AC models.

For DC power input models:

1. Loosen or remove the screws on the terminal block.

2. Connect the 20-60 VDC power line to the terminal block.

3. Tighten the connections using the screws on the terminal block.

For AC power input models:

• Connect the 100-240 VAC power line to the AC connector.

Note that the unit does not have an on/off switch. It automatically turns on when it receives power. The PWR

LED on the front panel will glow to indicate that the unit is receiving power. There are two DC power inputs for

redundancy.

Connecting Serial Devices

The unit’s serial port(s) are located on the back panel. If you are connecting an RS-485 multidrop network with

multiple devices, note the following:

• All devices that are connected to a single serial port must use the same protocol (i.e., either Modbus RTU

or Modbus ASCII).

• Each master device must connect to its own port on the unit. If you are connecting to a network with both

master and slave devices, the master must be connected to a separate port from the slaves.

For serial port pin assignments, refer to the Pin Assignments section.

RS-485 Termination and Pull High/Low Resistors

In some critical RS-485 environments, you may need to add termination resistors to prevent the reflection of

serial signals. When using termination resistors, it is important to set the pull high/low resistors correctly so

that the electrical signal is not corrupted. For each serial port, DIP switches or jumper settings are used to set

the pull high/low resistor values. A built-in 120 Ω termination resistor can also be enabled.

To modify the termination and pull high/low resistor settings, refer to the hardware reference chapter for your

model.

ATTENTION

Do not use the 1 KΩ pull high/low setting on the MGate

MB3660 when using the RS-

232 interface. Doing so will

degrade the RS

-232 signals and reduce the effective communication distance.

MGate MB3660 Modbus Gateway Getting Started

2-3

Connecting to a Host or the Network

Two 10/100BaseT Ethernet ports are located on the gateway’s back panel. These ports are used to connect the

unit to a host or Ethernet network, as follows:

• For normal operation, use a standard straight-through Ethernet cable to connect the unit to your Modbus

TCP network.

• For initial configuration or for troubleshooting purposes, you may connect the unit directly to a PC.

The unit’s Link LED will light up to indicate a live Ethernet connection.

The MGate MB3660 has two Ethernet ports with two MAC addresses. Hence, the unit can be connected by two

different IP addresses.

Installing the Software

The Device Search Utility (DSU) can be installed from the Documentation and Software CD. Follow the

onscreen instructions after inserting the CD. For additional details, refer to Chapter 3: Device Search Utility.

Wiring Requirements

ATTENTION

Safety First!

Be sure to disconnect the power cord before installing and/or wiring your

MGate MB3660.

Wiring Caution!

Calculate the maximum possible current in each power wire and common wire. Observe all electrical codes

dictating the maximum

allowed current for each wire size.

If the current

goes over the allowed maximum, the wiring could overheat, causing serious damage to your

equipment.

Temperature Caution!

Be careful when handling the

MGate MB3660. When plugged in, the MGate MB3660’s internal components

generate h

eat, and consequently the board may feel too hot to touch.

You should also observe the following common wiring rules:

• Use separate paths to route wiring for power and devices. If power wiring and device wiring paths must

cross, make sure the wires are perpendicular at the point of intersection.

NOTE

Do not run signal or communication wiring and power wiring in the same wire conduit. To avoid interference,

wires with different signal characteristics should be routed separately.

• You can use the type of signal transmitted through a wire to determine which wires should be kept separate.

The rule of thumb is that wiring that shares similar electrical characteristics can be bundled together.

• Keep input wiring and output wiring separate.

• When necessary, we strongly advise labeling wiring to all devices in the system.

MGate MB3660 Modbus Gateway Getting Started

2-4

LED Indicators

Item Description

Reset Button Press the Reset button for five seconds to load factory defaults. The MGate MB3660

will beep twice when the configuration has been reset.

(LEDs)

PWR 1, PWR 2 Red Power connection

Off Power cable is not connected

Ready Red Steady on: Power is on, and unit is booting up

Blinking: IP conflict, the DHCP or BOOTP server did not respond

properly, or a relay output occurred

Green Steady on: Power is on, and unit is functioning normally

Blinking: Unit is responding to locate function

Off Power is off, or power error condition exists

Tx 1–8 (16) Green Serial port is transmitting data

Rx 1–8 (16)

Amber

Serial port is receiving data

LAN 1, LAN 2 Green Indicates 100 Mbps Ethernet connection

Amber Indicates 10 Mbps Ethernet connection

Off Ethernet cable is disconnected

Dimensions

DC Model

MGate MB3660 Modbus Gateway Getting Started

2-5

AC Model

Adjustable Pull High/Low Resistors for the
RS-485 Port

In some critical environments, you may need to add termination resistors to prevent the reflection of serial

signals. When using termination resistors, it is important to set the pull high/low resistors correctly so that the

electrical signal is not corrupted. The MGate MB3660 uses DIP switches to set the pull high/low resistor values

for each serial port. Tear open the screws and find the DIP switches located at the back side of the PCB.

To add a 120 Ω termination resistor, set switch 3 on the port’s assigned DIP switch to ON; set switch 3 to

OFF (the default setting) to disable the termination resistor.

To set the pull high/low resistors to 150 KΩ, set switches 1 and 2 on the port’s assigned DIP switch to OFF.

This is the default setting.

To set the pull high/low resistors to 1 KΩ, set switches 1 and 2 on the port’s assigned DIP switch to ON.

ATTENTION

Do not use the 1 KΩ pull high/low setting on the MGate

MB3660 when using the RS-

232 interface. Doing so will

degrade the RS

-232 signals and reduce the effective communication distance.

Pin Assignments

The MGate MB3660 uses DB9 serial ports to connect to Modbus RTU or ASCII devices. Each port supports three

serial interfaces that select by software: RS-232, RS-422, and RS-485 (both 2 and 4-wire).

RJ45 (Ethernet, Console)

Pin Ethernet Console (RS-232)

1

Tx+

DSR

2 Tx- RTS

3 Rx+ GND

4 – TxD

5 – RxD

6 Rx- DCD

7 – CTS

8 – DTR

MGate MB3660 Modbus Gateway Getting Started

2-6

Male DB9 (Serial port)

Pin RS-232 RS-422/RS-485-4W RS-485-2W

1 DCD TxD-(A) –

2 RxD TxD+(B) –

3 TxD RxD+(B) Data+(B)

4 DTR RxD-(A) Data-(A)

5 GND GND GND

6 DSR – –

7 RTS – –

8 CTS – –

9 – – –

Power Input (DC Model)

Relay Output

N.O.

Common N.C.

Rackmount

The MGate MB3660 is designed to be mounted on a standard 19-inch rack. Use the enclosed pair of L-shaped

metal brackets and screws to fasten your MGate MB3660 to the rack cabinet. Each L-shaped bracket has six

holes, leaving two outer or inner holes available for other uses. You have two options. You can lock either the

front or rear panel of the MGate MB3660 to the front of the rack. Locking the front panel is shown in the

following figure.

MGate MB3660 Modbus Gateway Getting Started

2-7

Specifications

Ethernet Interface

Number of Ports:

2 ports (2 IP addresses)

Speed

: 10/100 Mbps, Auto MDI/MDIX

Connector

: RJ45 x 2

Protocols:

Modbus TCP Client/Server

Serial Interface

Number of Ports:

MGate MB3660

-8: 8 ports

MGate MB3660

-16: 16 ports

Serial Standards: RS-232/422/485, software selectable

Connector:

DB9 male

RS

-485 Data Direction Control: ADDC® (automatic data direction control)

Isolation Protection:

2 kV (for “-I” model)

Protocols:

Modbus RTU/ASCII Master/Slave

Serial Communication Parameters

Data Bits:

8

Stop Bits:

1, 2

Parity:

None, Even, Odd, Space, Mark

Flow Control:

RTS/CTS, DTR/DSR, RTS Toggle (RS-232 only)

Transmission Speed:

50 bps to 921.6 Kbps

Serial Signals

RS

-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND

RS

-422: Tx+, Tx-, Rx+, Rx-, GND

RS

-485 (4-wire): Tx+, Tx-, Rx+, Rx-, GND

RS

-485 (2-wire): Data+, Data-, GND

Software

Configuration Options:

Web console, Serial console, Telnet console

Utilities:

Device Search Utility (DSU) for Windows 95, 98, ME, NT, 2000, Windows XP, Server 2003, Vista,

Server 2008 (x86/x64), Windows Server 2008 R2, Windows 7/8/8.1 (x86/x64), Windows Server 2012 (x64),

Windows 2012 R2

Network protocols:

TCP/IP, UDP, HTTP, SMTP, NTP, DNS, DHCP Client, SNMPv1 (read only), ARP, Telnet,

Radius

Multi

master and Multidrop: Master mode: 128 Modbus TCP servers; Slave mode: 256 Modbus TCP clients

Physical Characteristics

Fault Relay Circuit:

3-pin circuit with current carrying capacity of 2 A @ 30 VDC

External Storage Drive:

SD card for configuration backup

Housing:

Metal, IP30 protection

Dimensions:

Without ears: 440 x 45 x 198 mm (17.32 x 1.77 x 7.80 in)

With ears: 480 x 45 x 198 mm

(18.90 x 1.77 x 7.80 in)

Environmental Limits

Operating Temperature:

0 to 60°C (32 to 140°F)

Storage Temperature:

-40 to 85°C (-40 to 185°F)

Ambient Relative Humidity:

5 to 95% (non-condensing)

Power Requirements

Input Voltage:

For DC models:

Dual 20 to 60 VDC (1.5 kV isolation)

For AC models: Dual 100 to 240 VAC, 47 to 63 Hz

Power Connector: Terminal block (for DC models)

MGate MB3660 Modbus Gateway Getting Started

2-8

Power Consumption:

MGate MB3660

-8-2AC: 144mA/110V, 101mA/220V

MGate MB3660

-8-2DC: 312mA/24V, 156mA/48V

MGate

MB3660I-8-2AC: 244mA/110V, 159mA/220V

MGate MB3660

-16-2AC:178mA/110V,120mA/220V

MGate MB3660

-16-2DC: 390mA/24V, 195mA/48V

Standards and Certifications

Safety:

UL 60950-1, EN 60950-1 (LVD)

EMC:

CE, FCC

EMS:

EN 550

32/24

EN 61000

-4-2 (ESD) Level 3 for power side, Level 4 for serial side (Contact: 8 kV, Air: 15 kV)

EN 61000

-4-3 (RS) Level 2

EN 61000

-4-4 (EFT) Level 2

EN 61000

-4-5 (Surge) Level 3

EN 61000

-4-6 (CS), Level 3

EN 61000-4-8 (PFMF) Level 3

Shock:

IEC 60068-2-27, IEC 60870

Freefall:

IEC 60068-2-32

Vibration:

IEC 60068-2-64, IEC 61373

Warranty

Warranty Period:

5 years

Details:

See www.moxa.com/warranty

3

3. Device Search Utility

The following topics are covered in this chapter:



Installing the Software



Starting Device Search Utility (DSU)



Connecting to the Unit

 Broadcast Search

 Search IP

 Locate



Upgrading the Firmware

MGate MB3660 Modbus Gateway Device Search Utility

3-2

Installing the Software

The following instructions explain how to install the Device Search Utility (abbreviated DSU), a utility for

configuring and monitoring MGate MB3660 units over the network.

1. Insert the Document and Software CD into the CD-ROM drive. Locate and run the following setup program

to begin the installation process:

dsu_setup_[Version]_Build_[DateTime].exe

The latest version might be named dsu_setup_Ver2.0_Build_xxxxxxxx.exe, for example:

2. You will be greeted by the Welcome window. Click Next to continue.

3. When the Select Destination Location window appears, click Next to continue. You may change the

destination directory by first clicking on Browse....

MGate MB3660 Modbus Gateway Device Search Utility

3-3

4. When the Select Additional Tasks window appears, click Next to continue. You may select Create a

desktop icon if you would like a shortcut to DSU on your desktop.

5. Click Install to start copying the software files.

MGate MB3660 Modbus Gateway Device Search Utility

3-4

6. A progress bar will appear. The procedure should take only a few seconds to complete.

7. A message will indicate that DSU is successfully installed. You may choose to run it immediately by selecting

Launch DSU.

8. You may also open DSU through Start  Programs  MOXA  DSU, as shown below.

MGate MB3660 Modbus Gateway Device Search Utility

3-5

Starting Device Search Utility (DSU)

DSU is a Windows-based utility that is used to configure the MGate MB3660 Series.

Before running DSU, make sure that your PC and the MGate MB3660 are connected to the same network.

Alternatively, the MGate MB3660 Series may be connected directly to the PC for configuration purposes. Refer

to Chapter 2 for more details.

You may open DSU from the Windows Start menu by clicking Start  Programs  MOXA  DSU. The DSU

window should appear as shown below.

Connecting to the Unit

The DSU needs to connect to the unit before the unit can be configured. There are two methods to connect to

the unit. Broadcast Search is used to find all MGate MB3660 units on the LAN. Search IP attempts to connect

to a specific unit by IP address, which is useful if the unit is located outside the LAN or can only be accessed by

going through a router.

MGate MB3660 Modbus Gateway Device Search Utility

3-6

Broadcast Search

Click Search and a new Search window will pop up.

MGate MB3660 Modbus Gateway Device Search Utility

3-7

When the search is complete, every MGate MB3660 found on the LAN will appear in the DSU window. The MAC

address, IP address, and Firmware version of each unit will be shown. Select the one you would like to

configure.

MGate MB3660 Modbus Gateway Device Search Utility

3-8

Search IP

Click Search IP if you know the IP address of the unit and wish to connect to it directly.

Enter the unit’s IP address and click OK.

If the search is successful, the unit will be listed in the DSU window. Right click the unit to open a pop-up list

of possible actions, or double click a unit to open the web console.

Locate

The Locate function will cause the unit to beep, so you can determine which unit is the target.

The Assign IP function allows you to change the unit’s IP addresses.