Moxa Technologies MGate 4101-MB-PBS-T User manual

MGate 4101-MB-PBS Modbus Serial-to-
PROFIBUS Slave Gateway User Manual
Version 6.1, April 2022
www.moxa.com/products
© 2022 Moxa Inc. All rights reserved.

MGate 4101-MB-PBS Modbus Serial-to-PROFIBUS Slave Gateway User
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
© 2022 Moxa Inc. All rights reserved.
Trademarks
The MOXA logo is a registered trademark of Moxa Inc.
All other trademarks or registered marks in this manual belong to their respective manufacturers.
Disclaimer
•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.
Technical Support Contact Information
www.moxa.com/support

Table of Contents
1. Introduction ................................................................................................................................... 4
Overview........................................................................................................................................ 4
Package Checklist ............................................................................................................................ 4
Produc t Features.............................................................................................................................. 4
2. Getting Started ............................................................................................................................... 5
Connecting Power ............................................................................................................................ 5
Connecting PROFIBUS Devices ........................................................................................................... 5
Connecting Modbus Serial Devices ...................................................................................................... 5
Connecting to a Host via Serial Console Cable....................................................................................... 5
3. Hardware........................................................................................................................................ 6
Power Input and Relay Output Pinouts................................................................................................. 6
LED Indicators................................................................................................................................. 6
Dimensions ..................................................................................................................................... 6
Pin Assignments .............................................................................................................................. 7
Mounting the Unit ............................................................................................................................ 8
Specifications .................................................................................................................................. 8
Adjustable Pull High/Low Resistors for the Modbus Port (P1) in RS-485 Mode ............................................10
Reset Button ..................................................................................................................................10
Rotary Switch.................................................................................................................................11
4. Configuration................................................................................................................................ 12
Installing the Software.....................................................................................................................12
Starting MGate Manager...................................................................................................................15
Change Language Setting..........................................................................................................16
Connecting to the Unit .....................................................................................................................17
Broadcast Search.....................................................................................................................17
Specify by IP Address ...............................................................................................................17
Connect through COM Port ........................................................................................................17
Search ...................................................................................................................................18
Modifying the Configuration ..............................................................................................................19
Configure Device .....................................................................................................................20
Configure Modbus Settings ........................................................................................................21
Set Up PROFIBUS ....................................................................................................................22
IO Mapping Setup ....................................................................................................................23
Auto Mapping..........................................................................................................................29
QuickLink ...............................................................................................................................30
Paging ...................................................................................................................................31
Load Default ...........................................................................................................................33
Monitoring Modbus Activity ........................................................................................................34
Diagnose ................................................................................................................................37
Upgrading Firmware ........................................................................................................................39
Import/Export ................................................................................................................................40
Off-Line Configuration......................................................................................................................44
A. Quick Configuration ...................................................................................................................... 46
Typical Applications .........................................................................................................................46
Quick Configuration Steps ................................................................................................................47
PROFIBUS Overview........................................................................................................................48
Modbus Overview............................................................................................................................48
Diagnose Packet Format...................................................................................................................50

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1. Introduction
Welcome to the MGate 4101-MB-PBS line of Modbus to PROFIBUS gateways. All models feature easy
protocol conversion from Modbus to PROFIBUS, and RS-232/422/485 port for Modbus communication.
Overview
The MGate 4101-MB-PBS is a line of protocol gateways that provides users with the following features:
Protocol conversion between Modbus and PROFIBUS
MGate 4101-MB-PBS series products can be used to connect Modbus devices and PROFIBUS devices to
provide PLCs (ex. Siemens S400, S300) with remote maintenance capability.
Windows utilities for easy setup and traffic monitoring
A Windows utility is provided to make configuration and operation of the MGate 4101-MB-PBS as easy as
possible. The utility uses serial console port to connect MGate 4101-MB-PBS unit. Besides, Wizard functions
can help you finish configuration in only several minutes by automatic commands detection and automatic
memory mapping.
Package Checklist
All models of the MGate 4101-MB-PBS series are shipped with the following items:
Standard Accessories:
•1 MGate 4101-MB-PBS Modbus Serial-to-PROFIBUS Slave Gateway.
•Quick Installation Guide (printed).
•Warranty card.
•RJ45 to DB9 cable (for console use)
Optional Accessories:
•WK-36-02: Wall mounting kit
•Mini DB9F-to-TB Adaptor: DB9 female to terminal block adapter
Note
Notify your sales representative if any of the above items is missing or damaged.
Product Features
•Automatic Windows configuration utility
•Redundant dual DC power inputs
•Enhanced surge protection for serial and power
•2 kV isolation for serial signals (-I model only)
•PROFIBUS connector to connect the gateway to the field bus
•Power-off warning by relay output
•Software-selectable RS-232/422/485 communication

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2. Getting Started
Connecting Power
The unit can be powered using the AC adaptor or by connecting a power source to the terminal block,
depending on the model. The following instructions are for the AC adaptor:
1. Plug the connector of the power adapter into the DC-IN jack on the back of the unit.
2. Plug the power adapter into an electrical outlet.
Follow these instructions to connect a power source to the terminal block:
1. Loosen or remove the screws on the terminal block.
2. Connect the 12–48 VDC power line to the terminal block.
3. Tighten the connections using the screws on the terminal block.
Note that the unit does not have an on/off switch. It automatically turns on when it receives power. The
PWR LED on the top panel will glow to indicate that the unit is receiving power. For power terminal block pin
assignments, please refer to the hardware reference chapter for your model.
Connecting PROFIBUS Devices
The unit’s PROFIBUS port(s) are located on the front panel. Use a PROFIBUS cable to directly connect the
unit to a PROFIBUS PLC or other PROFIBUS master.
For the PROFIBUS port pin assignments, please refer to Chapter 3. This information can then be used to
construct your own PROFIBUS cable.
Connecting Modbus Serial Devices
The unit’s Modbus port(s) are located on the front panel. Use a Modbus cable to directly connect the unit to
a Modbus RTU/ASCII device.
For the Modbus port pin assignments, please refer to Chapter 3. This information can then be used to
construct your own Modbus cable.
Connecting to a Host via Serial Console Cable
A RS-232 serial console port is located on the unit’s front panel. This port is used for console configuration
via a CBL-RJ45-F9-150 RJ-45-to-DB9 cable.
For normal operation, use a standard straight-through RS-232 serial cable to connect the unit to your COM
port. You connect the unit directly to a PC. Besides, use a serial cable to connect the unit to your PC’s serial
connector.
The Tx/Rx LED of the console port will light up to indicate serial connection status when data is
communicated with each other.

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3. Hardware
Power Input and Relay Output Pinouts
V2+ V2- V1+ V1-
Shielded
Ground
DC Power
Input 2
DC Power
Input 2
N.O. Common N.C.
DC Power
Input 1
DC Power
Input 1
LED Indicators
LED
Color
Function
PWR1
Green
Power is on.
Off
Power is off.
PWR2
Green
Power is on.
Off
Power is off.
Ready
Green
Gateway is operational.
Red
Gateway has wrong settings.
Off
Power is off or fault condition exists.
P1 Tx/Rx
(Modbus Serial)
Green
Serial device is transmitting data.
Orange
Serial device is receiving data.
Off
No data is flowing to or from the serial port.
P2 Status
(PROFIBUS)
Green
Steady: Data is exchanging
Red
Steady: Baudrate automatically identified. Wrong slave address or
CHK_PRM, or CHK_CFG will remain steady red
Off
PROFIBUS offline
Dimensions

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Pin Assignments
Modbus P1 Pin Assignment
The MGate 4101-MB-PBS series use DB9 (male) serial port to connect to Modbus devices.
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
–
–
–
PROFIBUS P2 Pin Assignment
The MGate 4101-MB-PBS series use DB9 (female) serial port to connect to P ROFIBUS devices.
PIN
Signal Name
1
N.C.
2
N.C.
3
PROFIBUS D+
4
RTS
5
Signal common
6
5V
7
N.C.
8
PROFIBUS D-
9
N.C.
Console (RS-232) Pin Assignment
The MGate 4101-MB-PBS series use RJ45 serial port to connect to PC to configure device.
PIN
RS-232
1
DTR
2
RTS
3
GND
4
TXD
5
RXD
6
DCD
7
CTS
8
DTR

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Mounting the Unit
The unit can be mounted on the wall or on a DIN-rail. The MGate 4101-MB-PBS/4101I-MB-PBS series is
designed to be attached to a DIN-rail or mounted on a wall. For DIN-rail mounting, push down the spring
and properly attach it to the DIN-rail until it “snaps” into place. For wall mounting, install the wall mount kit
(optional) first, and then screw the device onto the wall. The following figure illustrates the two mounting
options:
Specifications
Power Input
Input Voltage: 12 to 48 VDC
Input Current: 275 mA @ 12 VDC
Connector: 8-pin terminal block (GND, V1+, V1-, Relay NO, Common, Relay NC, V2+, V2-), screw
mounting
Modbus Serial Interface
Protocol: Modbus ASCII/RTU, Master/Slave
Number of Ports: 1
Serial Standards: RS-232/422/485, software selectable
Data Bits: 7, 8
Stop Bits: 1, 2
Parity: None, Even, Odd, Space, Mark
Flow Control: RTS/CTS, XON/XOFF
Baudrate: 50 bps to 921.6 kbps
Connector: DB9 male
Serial Line Protection ESD: 15 kV protection for all signals
Isolation: 2 kV protection (MGate 4101I-MB-PBS only)
RS-485 Data Direction Control: ADDC® (automatic data direction control)
Pull High/Low Resistor for RS-485: 1 kΩ, 150 KΩ (switchable)
Terminal Resister: 120 Ω for RS-485
Modbus Function: 1, 2, 3, 4, 5, 6, 15, 16
Modbus Serial Signals

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RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND
RS-422: Tx+, Tx-, Rx+, Rx-, GND
RS-485-4w: Tx+, Tx-, Rx+, Rx-, GND
RS-485-2w: Data+, Data-, GND
PROFIBUS Interface
Protocol: PROFIBUS DP-V0 Slave
Data Rate: 9600 bps, 19.2, 93.75, 187.5, 500 kbps, 1.5, 3, 6 and 12 Mbps
Connector: DB9 female
Isolation: Built-in 2 kV
Rotary Switch: PROFIBUS address 0~99 (addresses 100 to 125 supported by SW)
Console Interface
RS-232 (TxD, RxD, GND), 8-pin RJ45 (115200, n, 8, 1)
Utility
Driver Support: Windows 2000/XP/2003/Vista/2008/7/8/8.1 x86/x64, 2012/2012 R2
Physical Characteristics
Housing: Metal, IP30 protection
Dimensions: 36 x 105 x 140 mm (1.42 x 4.13 x 5.51 in)
Environmental Limits
Operating Temperature:
Standard Temp. Models:
0 to 60°C (32 to 140°F)
Wide Temp. Models:
-40 to 75°C (-40 to 167°F)
Operating Humidity: 5 to 95% RH
Storage Temperature: -40 to 85°C (-40 to 185°F)
Standards and Certifications
Safety: EN 60950-1, UL 60950-1, EN 62368-1, UL 62368-1
Hazardous Location: ATEX, Class I Division 2, IECEx
EMC: EN 55032/35
EMI: CISPR 32, FCC Part 15B Class A
EMS:
IEC 61000
-4-2 ESD: Contact: 6 kV; Air: 8 kV
IEC 61000
-4-3 RS: 80 MHz to 1 GHz: 3 V/m
IEC 61000
-4-4 EFT: Power: 2 kV; Signal: 1 kV
IEC 61000
-4-5 Surge: Power: 2 kV; Signal: 2 kV
IEC 61000
-4-6 CS: 150 kHz to 80 MHz: 10 V/m; Signal: 10 V/m
IEC 61000
-4-8 PFMF
Shock: IEC 60068-2-27
Freefall: IEC 60068-2-32
Vibration: IEC 60068-2-6, IEC 60068-2-64
Reliability
Alert Tools: Built-in buzzer
MTBF:
MGate 4101
-MB-PBS Series: 1,537,948 hrs
MGate 4101I
-MB-PBS Series: 1,315,666 hrs
Warranty
Warranty Period: 5 years
Details: See www.moxa.com/warranty

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Adjustable Pull High/Low Resistors for the
Modbus Port (P1) in RS-485 Mode
Default
SW
1
2
3
Pull High
Pull Low
Terminator
ON
1 KΩ
1 KΩ
120 Ω
OFF
150 KΩ
150 KΩ
–
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 uses jumper settings or DIP switches to set the pull
high/low resistor values for each serial port.
To set the pull high/low resistors to 150 KΩ, make sure that the two jumpers assigned to the serial
port are not shorted by jumper caps. This is the default setting.
To set the pull high/low resistors to 1 KΩ, make sure that the two jumpers assigned to the serial port
are shorted by jumper caps.
ATTENTION
Do not use the 1 KΩ setting on the MGate when using the RS-232 interface. Doing so will degrade the RS-
232 signals and shorten the maximum allowed communication distance.
Reset Button
To reset the MGate to the factory default settings, hold down the reset button for about 5 seconds. The
MGate will restart and be reset to factory default settings.

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Rotary Switch
Before communication, you must assign a slave ID to the PROFIBUS slave, If you would like to assign an
address between 0 to 99, you need to change the rotary switch to the desired address. If you would like to
assign an address which is over 99, you must set it in the MGate utility.

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4. Configuration
Installing the Software
The following instructions explain how to install MGate Manager, a utility for configuring and monitoring
MGate 4101-MB-PBS units over the network.
1. Please download the MGate Manager software from Moxa's website at http://www.moxa.com. Then,
locate and run the following setup program to begin the installation process:
MGM_Setup_[Version]_Build_[DateTime].exe
(The latest version could have the following format: MGM_Setup_Verx.x.x_Build_xxxxxxxx.exe.)
2. You will be greeted by the Welcome window. Click Next to continue.

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3. When the Select Destination Location window appears, click Next to continue. You may change the
destination directory by first clicking on Browse.
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 MGate Manager on your desktop.

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5. Click Next to start copying the software files.
6. A progress bar will appear. The procedure should take only a few seconds to complete.

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7. A message will indicate that MGate Manager is successfully installed. You may choose to run it
immediately by selecting Launch MGate Manager.
Starting MGate Manager
MGate Manager is a Windows-based utility that is used to configure the MGate 4101-MB-PBS.
Before running MGate Manager, make sure that the MGate 4101-MB-PBS is connected to your PC. Please
refer to Chapter 2 for more details.
You may open MGate Manager from the Windows Start menu by clicking Start > Programs > MGate
Manager > MGate Manager. The MGate Manager window should appear as shown below.

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Change Language Setting
If you wish to run MGate Manager in a different language, you may click Language to change the language
setting. A dialog box showing the available languages should appear as shown below.
When you click OK, MGate Manager will immediately reflect your chosen language.
After changing to a different language, you will find that all strings on MGate Manager are replaced in your
chosen language. For example, the above picture is shown in English. However, no matter what language
you choose, it won’t change the label on the language button.
ATTENTION
Set your MGate Manager to “Default Language” before contacting Moxa Technical Support.
With support for multiple languages, MGate Manager is more user-friendly and accessible. However, if you
need assistance from Moxa Technical Support, please change the language to “Default Language”. This will
prevent any misunderstandings or confusion about MGate Manager menu items and commands as our
engineers assist you.
The default language is English and will only be active for the current MGate Manager session. When you
open MGate Manager again, the language will revert to your original setting.

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Connecting to the Unit
Prior to configuration, MGate Manager must be connected to its unit. There are three methods to establish
connection. Broadcast Search locates the MGate series on the LAN. Search by 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. Connect through COM port tries to connect to a separate unit via a RS-232 serial
COM port.
Broadcast Search
Broadcast Search is used for MGate Ethernet Gateways, such as the MGate MB3000 and MGate EIP3000
series, which are discovered via Ethernet by using broadcast IP. In addition, whenever you add an MGate
4101-MB-PBS via serial console, MGate Manager will automatically record the COM port(s) for the broadcast
to search as well. Note that restarting MGate Manager will erase the COM port(s) record.
Specify by IP Address
Specify by IP Address is used for MGate Ethernet Gateways, such as the MGate MB3000 and MGate
EIP3000 series, which are discovered via Ethernet by using a specific IP address. Click Specify by IP
Address if you know the IP address of the unit and wish to connect to it directly.
ATTENTION
If Search by IP Address fails to locate the MGate MB3000 or MGate EIP3000 series, the IP address that
you entered might be incorrect. Try doing the search again and re-entering the IP address carefully.
Another possibility is that the MGate MB3000 or MGate EIP3000 series is located on the same LAN as your
PC, but on a different subnet. In this case, you can modify your PC’s IP address and or netmask so that it
is on the same subnet as the MGate MB3000 or MGate EIP3000 series. After your PC and the MGate
MB3000 or MGate EIP3000 series are on the same subnet, MGate Manager should be able to find the unit.
Connect through COM Port
Connect through COM Port is used for MGate PROFIBUS Gateways, such as the MGate 4101-MB-PBS
series, which are discovered via RS-232 serial COM Port. Click Connect through COM Port if you know the
COM port number of the unit.

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Search
Click Search to begin searching the serial console for the M Gate 4101-MB-PBS units.
A dialog box will appear. Click Connect through COM Port and choose which COM port is used to connect
to MGate 4101-MB-PBS.

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Modifying the Configuration
Once your unit is displayed in MGate Manager, select it by clicking on it. The Configuration button will
become available. Click Configuration to open the configuration window.

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Configure Device
In first page, you can change device name and select a password to protect the unit from unauthorized
access.
Parameter
Value
Notes
Name (an alphanumeric string)
You can enter a name to help you identify the unit, such as
the location, function, etc.
Password (an alphanumeric string)
You can set a password to prevent unauthorized users
from configuring the unit. The password will be required
when anyone attempts to configure the unit over the
network. Modbus operation is not affected by the
password.
Confirm password
(an alphanumeric string)
Re-type the password again for confirmation.
ATTENTION
To erase an existing password, leave both the New Password and Confirm Password text input boxes
blank. The password will be erased when you click OK in the bottom right corner.