Planet Networking & Communication IMG-120T User manual

User’s Manual of IMG-120T
-1-
IMG-120T
Industrial 2-Port RS422/485
Modbus Gateway

User’s Manual of IMG-120T
-2-
Trademarks
Copyright PLANET Technology Corp. 2017.
Contents are subject to change without prior notice.
PLANET is a registered trademark of PLANET Technology Corp. All other trademarks belong to their respective
owners.
Disclaimer
PLANET Technology does not warrant that the hardware will work properly in all environments and applications,
and makes no warranty and representation, either implied or expressed, with respect to the quality, performance,
merchantability, or fitness for a particular purpose. PLANET has made every effort to ensure that this User's
Manual is accurate; PLANET disclaims liability for any inaccuracies or omissions that may have occurred.
Information in this User's Manual is subject to change without notice and does not represent a commitment on the part of
PLANET. PLANET assumes no responsibility for any inaccuracies that may be contained in this User's Manual. PLANET
makes no commitment to update or keep current the information in this User's Manual, and reserves the right to make
improvements to this User's Manual and/or to the products described in this User's Manual, at any time without notice.
If you find information in this manual that is incorrect, misleading, or incomplete, we would appreciate your
comments and suggestions.
FCC Warning
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, it may cause harmful interference to
radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.
CE Mark Warning
This is a Class B product. In a domestic environment, this product may cause radio interference, in which case
the user may be required to take adequate measures.
Energy Saving Note of the Device
This power required device does not support Standby mode operation. For energy saving, please remove the
power cable to disconnect the device from the power circuit. In view of saving the energy and reducing the
unnecessary power consumption, it is strongly suggested to remove the power connection for the device if this
device is not intended to be active.

User’s Manual of IMG-120T
-3-
WEEE Warning
To avoid the potential effects on the environment and human health as a result of the presence of
hazardous substances in electrical and electronic equipment, end users of electrical and electronic
equipment should understand the meaning of the crossed-out wheeled bin symbol. Do not dispose of
WEEE as unsorted municipal waste and have to collect such WEEE separately.
Revision
PLANET Industrial 2-port RS422/485 Modbus Gateway User's Manual
MODEL: IMG-120T
Revision: 1.1 (August, 2017)
Part No.: 2081-AH1230-001

User’s Manual of IMG-120T
-4-
TABLE OF CONTENTS
CHAPTER 1. INTRODUCTION..............................................................................................6
1.1 PACKAGE CONTENTS ....................................................................................................................6
1.2 HOW TO USE THIS MANUAL...........................................................................................................6
1.3 PRODUCT DESCRIPTION................................................................................................................7
1.4 APPLICATIONS ..............................................................................................................................9
1.5 PRODUCT FEATURES ..................................................................................................................10
1.6 PRODUCT SPECIFICATIONS..........................................................................................................11
CHAPTER 2. HARDWARE INSTALLATION.......................................................................13
2.1 HARDWARE DESCRIPTION ...........................................................................................................13
2.1.1 Product Layout............................................................................................................. 13
2.1.2 LED Indicators ............................................................................................................. 14
2.1.3 2-Contact Terminal Block Pin Define........................................................................... 15
2.1.4 5-Contact Terminal Block Pin Define........................................................................... 15
2.1.5 Hardware DIP Switch for Reset to Default...................................................................... 16
CHAPTER 3. INDUSTRIAL MODBUS GATEWAY MANAGEMENT ..................................17
3.1 OVERVIEW..................................................................................................................................17
3.2 REQUIREMENTS ..........................................................................................................................18
3.3 MANAGEMENT METHODS.............................................................................................................19
3.3.1 Web Management Interface ........................................................................................ 19
3.3.2 Login the Industrial Modbus Gateway Web Interface ................................................. 19
3.3.3 Remote IP-based Telnet Interface............................................................................... 21
3.3.4 Login the Industrial Modbus Gateway Telnet Interface............................................... 21
3.4 PLANET SMART DISCOVERY UTILITY..........................................................................................23
3.5 PLANET MODBUS GATEWAY UTILITY..........................................................................................25
3.5.1 Installing PLANET Modbus Gateway Utility ................................................................ 25
3.5.2 PLANET Modbus Gateway Utility Menu Bar............................................................... 29
3.5.3 PLANET Modbus Gateway Utility Shortcut Menu Bar ................................................ 34
3.5.4 PLANET Modbus Gateway Utility Device Function..................................................... 38
CHAPTER 4. WEB MANAGEMENT....................................................................................43
4.1 WEB MAIN PAGE.........................................................................................................................43
4.2 OVERVIEW..................................................................................................................................45
4.3 NETWORK SETTINGS...................................................................................................................46
4.4 SERIAL SETTINGS .......................................................................................................................48
4.4.1 COM Settings............................................................................................................... 48
4.4.2 COM Information.......................................................................................................... 49
4.5 MODBUS SETTINGS.....................................................................................................................51
4.5.1 Modbus Parameters..................................................................................................... 51

User’s Manual of IMG-120T
-5-
4.5.2 Slave ID........................................................................................................................ 52
4.6 STATE MONITORING....................................................................................................................59
4.6.1 4.6.1 COM State.......................................................................................................... 59
4.7 ACCESS CONTROL ......................................................................................................................60
4.7.1 Device Security............................................................................................................ 60
4.7.2 IP Filtering.................................................................................................................... 61
4.7.3 MAC Filtering............................................................................................................... 62
4.7.4 User Management ....................................................................................................... 62
4.8 SYSTEM MANAGEMENT ...............................................................................................................64
4.8.1 System Information...................................................................................................... 64
4.8.2 System File .................................................................................................................. 65
4.8.3 Logout & Reboot.......................................................................................................... 65
CHAPTER 5. COMMAND LINE INTERFACE......................................................................67
5.1 ACCESSING THE CLI ...................................................................................................................67
5.2 TELNET LOGIN ............................................................................................................................67
CHAPTER 6. COMMAND LINE MODE ...............................................................................69
APPENDIX A.........................................................................................................................72
A.1 DEVICE‘S RJ45 PIN ASSIGNMENTS ...............................................................................................72
A.2 RJ45 CABLE PIN ASSIGNMENT.......................................................................................................72

User’s Manual of IMG-120T
-6-
CHAPTER 1. INTRODUCTION
Thank you for purchasing PLANET Industrial 2-port RS422/485 Modbus Gateway, IMG-120T. The term
“Industrial Modbus Gateway” mentioned in this user’s manual refers to the IMG-120T.
1.1 Package Contents
Open the box of the Industrial Modbus Gateway and carefully unpack it. The box should contain the following
items:
Industrial Modbus Gateway x 1
Quick Installation Guide x 1
User’s Manual CD x 1
If any of these are missing or damaged, please contact your dealer immediately; if possible, retain the carton
including the original packing material, and use them again to repack the product in case there is a need to return
it to us for repair.
1.2 How to Use This Manual
This Industrial Modbus Gateway User Manual is structured as follows:
Section 2, HARDWARE INSTALLATION
The section explains the functions of the Industrial Modbus Gateway and how to physically install the
Industrial Modbus Gateway.
Section 3, INDUSTRIAL MODBUS GATEWAY MANAGEMENT
The section contains the information about the software function of the Industrial Modbus Gateway,
and also explains the PLANET Modbus Gateway utility and how to use the Industrial Modbus
Gateway.
Section 4, WEB MANAGEMENT
The section explains how to manage the Industrial Modbus Gateway by Web interface.
Section 5, COMMAND LINE INTERFACE
The section describes how to use the Command Line interface (CLI).
Section 6,COMMAND LINE MODE
The section explains how to manage the Industrial Modbus Gateway by Command Line interface.
Appendix A
The section contains cable information of the Industrial Modbus Gateway.

User’s Manual of IMG-120T
-7-
1.3 Product Description
Economical Solution for Industrial Modbus TCP/RTU/ASCII Network Integration
PLANET has added the Industrial Modbus TCP/IP Protocol to its IMG-120T Industrial-level 2-port RS422/485
Modbus Gateway, an industrial management level product that comes with SCADA/HMI system and other data
acquisition systems on the factory floor. Moreover, an industrial IT SNMP network can be upgraded to an
Industrial automation Modbus TCP/IP network without any difficulty and extra expense. The IMG-120T offers a
flexible network connectivity solution for industrial automation environment. PLANET IMG-120T is a conversion
bridge between Modbus TCP/IP Protocol and Modbus RTU/ASCII Protocol. It features a wide operating
temperature range from -40 to 75 degrees C and a compact but rugged IP40 metal housing.
The Conversion Bridge that Makes Communications Convenient
As the conversion bridge, the IMG-120T communicates well between any industrial equipment with the Modbus
RTU/ASCII Protocol and the administrator workstation that runs the Modbus TCP/IP Protocol. The RS422/485
serial interface of the IMG-120T provides the Modbus RTU/ASCII operation mode and various baud rate options
to meet the demand of integration between the Modbus TCP/IP Protocol, Modbus RTU Master/Slave Protocol
and Modbus ASCII Master/Slave Protocol.
The advantage of having the IMG-120T is to assist users to build an industrial environment between the Modbus
TCP/IP Protocol and the Modbus RTU/ASCII Protocol easily, thus offering an application solution to the industrial
control equipment without Ethernet ports. Thus, the industrial control equipment can only control through an
industrial PC workstation or industrial control panel.

User’s Manual of IMG-120T
-8-
In addition, the effective integration of Modbus Ethernet devices, Modbus serial equipment or multi Modbus
master/slave in an industrial hybrid network brings the following:
Master mode supports up to 32 slave TCP connection requests
Slave mode supports up to 16 TCP master connections
Remote Management
The IMG-120T makes the connected industrial Modbus RTU/ASCII equipment become IP-based facilities and is
able to connect to the Modbus TCP/IP network via its R422/485 serial interface and 10/100BASE-TX RJ45
Ethernet port. It provides a remote web management and telnet Interface for efficient remote network
management. The IMG-120T also provides PLANET Modbus Gateway utility tool and supports PLANET Smart
Discovery utility to help network administrator to easily get the current IP subnet address information or change
the IP subnet address setting of the IMG-120T.
Modbus Serial Port State Monitoring
The IMG-120T shows the details of the total bytes transmitted and received on the RS422/485 serial interface,
and the detailed total number of frames transmitted and received on the remote web/telnet management
interface. This function allows network administrator to check the status and statistics of the IMG-120T via the
single RS422/485 serial interface.
Stable Performance in Hardened Environment Design
The IMG-120T provides a high level of immunity against electromagnetic interference and heavy electrical
surges which are usually found on plant floors or in curb-side traffic control cabinets. Its operating temperature
ranging from -40 to 75 degrees C allows the IMG-120T to be placed in almost any difficult environment.
The IMG-120T is equipped with a compact IP40-rated metal case that allows wall mounting for efficient use of
cabinet space. The IMG-120T also provides an integrated power supply source with wide-ranging voltages (9 to
48V DC) ideally suitable for worldwide operation with high availability applications.

User’s Manual of IMG-120T
-9-
1.4 Applications
RTU/ASCII Master to Multi Modbus TCP/IP Slaves
The Industrial Modbus Gatewaycan act as a bridge between the industrial RTU/ASCII master equipment and the
multi-industrial TCP/IP slave equipment in a Modbus TCP/IP networking environment to control multi-industrial
TCP/IP slave equipment via the industrial RTU/ASCII master equipment.
Figure 1-1: RTU/ASCII Master to Multi Modbus TCP/IP Slaves Application
Multi Modbus TCP/IP Master to RTU/ASCII Slaves
The Industrial Modbus Gateway can operate as a bridge between the multi-industrial TCP/IP master equipment
and the industrial RTU/ASCII slave equipment in a Modbus TCP/IP networking environment to control the
industrial RTU/ASCII slave equipment via the multi-industrial TCP/IP master equipment.
Figure 1-2: Multi Modbus TCP/IP Master to RTU/ASCII Slaves Application

User’s Manual of IMG-120T
-10-
1.5 Product Features
Serial Interface
■Two RS422/485 ports with 5-contact terminal block
■Cost effective for RS422/RS485 to Fast Ethernet 10/100BASE-TX application
■Supports 4-wire RS422 or 2-wire RS485 with 5-contact terminal block operation
■300bps~115200bps baud rate and non-blocking communication
Ethernet Interface
■Complies with IEEE 802.3, IEEE 802.3u 10/100BASE-TX standard
■Supports 10/100BASE-TX RJ45 port with distance up to 100m
Serial Operation Modes
■Software Protocol supports Modbus TCP, Modbus RTU, Modbus ASCII, IP, ARP, DHCP and DNS
■Supports RTU Master, RTU Slave, ASCII Master, and ASCII Slave four serial operation modes via
management interface
■Master mode supports 32 slave TCP connection requests
■Slave mode supports 16 TCP master connections
Management Function
■Built-in IP-based Web interface and telnet interface for remote management
■Supports IP address and MAC address filtering function
■PLANET Modbus Gateway utility for finding client device on the network and related IP subnet address
setting to reset to factory default function
■PLANET Smart Discovery utility automatically finds the client devices on the network
■Firmware upgrade/configuration backup and restore via HTTP protocol
Hardware
■LED indicators for system, network and RS422/585 port diagnostics
■DIP switch on the upper panel for resetting to factory default
■Wall-mount kit
Industrial Case and Installation
■Wall mount-type IP40 metal case
■The 2-contact terminal block connector on the top panel of Industrial Modbus Gateway is used for DC power input
(9-48V)
■-40 to 75 degrees C operating temperature

User’s Manual of IMG-120T
-11-
1.6 Product Specifications
Model
IMG-120T
Serial Port
Interface
RS422/RS485 x 2
Connector
10-contact terminal block for RS422/RS485
Surge Protection
1KV
Baud Rate (Data Rate)
300bps to 115200bps
Data Bits
7, 8
Parity Type
Odd, Even, None, Space, Mark
Stop Bit
1, 2
Flow Control
H/W, None
Signals
RS422: Tx+, Tx-, GND, Rx+, Rx-
RS485: Data A (+), GND, Data B (-)
Distance
RS422/RS485 for 20m transfer distance
Operation Mode
RTU Master/RTU Slave/ASCII Master/ASCII Slave
Master mode: Supports up to 32 slave TCP connection requests
Slave mode: Supports up to 16 TCP master connection requests
Ethernet Port
Standard
IEEE 802.3 10BASE-T standard
IEEE 802.3u 100BASE-TX standard
IEEE 802.3x full-duplex flow control
Connector
RJ45
Distance
100 meters
Hardware
Copper Port
10/100BASE-T RJ45 TP x1, auto-MDI/MDI-X, auto-negotiation
Serial Port
RS422/RS485 x 2
DIP Switch
Reset system to factory default
LED Indicators
System: Power x 1
10/100BASE-TX Port: Link/Active x 1
RS422/RS485 Serial Port: TX (Transmit) x 2, RX (Receive) x 2
Dimensions (W x D x H)
69 x 100 x 22 mm
Weight
238g
Power Input Connector
2-contact terminal block connector DC power (9-48V)*
Power Consumption
1. 6 watts (max.)
Installation
Wall-mount kit
Mechanical
Metal
Management
Management
Remote Web Management
Remote Telnet Management
PLANET Modbus Gateway Utility
PLANET Smart Discovery Utility
Operation Mode
RTU Master
RTU Slave

User’s Manual of IMG-120T
-12-
ASCII Master
ASCII Slave
Standards Conformance
Standards Compliance
IEEE 802.310BASE-T standard
IEEE 802.3u 100BASE-TX standard
IEEE 802.3x full-duplex flow control
EIA/TIA RS422/485
Regulatory Compliance
FCC Part 15 Class B, CE
Stability Testing
IEC 60068-2-32 (free fall)
IEC 60068-2-27 (shock)
IEC 60068-2-6 (vibration)
Environment
Temperature
Operating: -40~75 degrees C
Storage: -40~75 degrees C
Humidity
Operating: 5~95% (non-condensing)
Storage: 5~95% (non-condensing)
*: Please follow the DC power input symbol on the front panel of the Industrial Modbus Gateway -- insert positive
DC power wire into V+, and negative DC power wire into V-. Otherwise, it will damage the device.

User’s Manual of IMG-120T
-13-
CHAPTER 2. HARDWARE INSTALLATION
This section describes the hardware features and installation of the Industrial Modbus Gateway’s components on
the desktop or shelf. For easier management and control of the Industrial Modbus Gateway, familiarize yourself
with its display indicators, and ports. Front panel illustrations in this chapter display the unit LED indicators.
Before connecting any network device to the Industrial Serial Converter, please read this chapter completely.
2.1 Hardware Description
2.1.1 Product Layout
Figure 2-1 shows the diagram of the Industrial Modbus Gateway, and the wall-mount kit for wall mounting.
Figure 2-1: Industrial Modbus Gateway

User’s Manual of IMG-120T
-14-
Figure 2-2 shows the front panel of the Industrial Modbus Gateway.
Figure 2-2: Industrial Modbus Gateway Front Panel
2.1.2 LED Indicators
■LED Definition
■System
LED Color Function
Power
Green
Lightsto indicate the system has power.
■10/100BASE-TX Interface
LED Color Function
LNK/ACT Green
Lights
: To indicate the link through that port is successfully established.
Blinks:
To indicate that the IMG-120T is actively sending or receiving data over that
port.
■RS422/RS485 Serial Port
LED Color Function
TX1/TX2 Green Blinks: To indicate that the IMG-120T is actively transmitting data over that port.

User’s Manual of IMG-120T
-15-
LED Color Function
RX1/RX2 Green Blinks: To indicate that the IMG-120T is actively receiving data over that port.
2.1.3 2-Contact Terminal Block Pin Define
■Wiring the Power Inputs:
The 2-contact terminal block connector on the top panel of the Industrial Modbus Gateway is used for DC power
input and the DC power input range is 9-48V.
1: Please follow the DC power input symbol on the front panel of the Industri
al Modbus
Gateway -- insert positive DC power wire into V+
, and negative DC power wire into
V-. Otherwise, it will damage the device.
2: The wire gauge for the terminal block should be in the range between 12 ~ 24 AWG.
2.1.4 5-Contact Terminal Block Pin Define
■Serial Port Connection:
The 5-contact terminal block connector on the lower panel of the Industrial Modbus Gateway is used for
RS422/485 connections.

User’s Manual of IMG-120T
-16-
2.1.5 Hardware DIP Switch for Reset to Default
The upper panel of the Industrial Modbus Gateway consists one 4-bit DIP switch for resetting the system to the
factory default mode.
■Resetting to default through hardware DIP switch:
1: Find the hardware DIP switch that is near the RJ45 port of the Industrial Modbus Gateway.
2: Adjust DIP 2 at the “ON” position and DIPs 1, 3, 4 remain at the original position.
3: After adjusting the DIP switch, please power off and power on the Industrial Modbus Gateway to
take effect.
After resetting the Industrial Modbus Gateway with the default IP address, and username
and password: admin, please adjust DIP 2 to lower position. Otherwise, the Industrial
Modbus Gateway will continue to reset to the factory default mode.

User’s Manual of IMG-120T
-17-
CHAPTER 3. INDUSTRIAL MODBUS GATEWAY
MANAGEMENT
This chapter describes how to manage the Industrial Modbus Gateway. Sections include:
•Overview
•-Requirements
•Management Methods
•PLANET Smart Discovery Utility
•PLANET Modbus Gateway Utility
3.1 Overview
This chapter gives an overview of the Industrial Modbus Gateway management. The Industrial Modbus Gateway
provides a remote IP-based WEB browser/Telnet interface. Using these interfaces, you can perform various
configuration and management activities, including:
Figure 3-1: Industrial Modbus Gateway Web Menu Bar
Figure 3-2: Industrial Modbus Gateway Telnet Menu

User’s Manual of IMG-120T
-18-
Please refer to the following Chapters 4, 5 and 6 for more details.
3.2 Requirements
Ethernet Port Connection
•Workstations running Windows XP/2003/Vista/7/8/2008/10, MAC OS X or later, Linux, UNIX, or other
platforms are compatible with TCP/IP protocols.
•Workstations are installed with Ethernet NIC (Network Interface Card)
Network cables -- Use standard network (UTP) cables with RJ45 connectors.
The above PC is installed with Web browser and JAVA runtime environment plug-in.
It is recommended to use Internet Explorer
8.0 or above to access the Industrial
Modbus Gateway. If the Web interface of the Industrial Modbus Gateway
is not
accessible, please turn off the anti-virus software or firewall and then try it again.

User’s Manual of IMG-120T
-19-
3.3 Management Methods
The way to manage the Industrial Modbus Gateway:
- Web Management interface
- Remote IP-based Telnet interface
3.3.1 Web Management Interface
The Industrial Modbus Gateway offers management features that allow users to manage the Industrial Modbus
Gateway from anywhere on the network through a standard browser such as Microsoft Internet Explorer. After
you set up your IP address for the Industrial Modbus Gateway, you can access the Industrial Modbus Gateway’s
Web interface applications directly in your Web browser by entering the IP address of the Industrial Modbus
Gateway.
Figure 3-3: Web Management Diagram
You can then use your Web browser to list and manage the Industrial Modbus Gateway configuration parameters
from one central location. Web Management requires either Microsoft Internet Explorer 8.0 or later, Google
Chrome, Safari or Mozilla Firefox 1.5 or later.
3.3.2 Login the Industrial Modbus Gateway Web Interface
The following shows how to start up the Web Management of the Industrial ModbusGateway. Note the Industrial
Modbus Gateway is configured through an Ethernet connection. Please make sure the manager PC must be set
to the same IP subnet address.
For example, the default IP address of the Industrial Modbus Gateway is 192.168.0.100, then the manager PC
should be set to 192.168.0.x (where x is a number between 1 and 254, except 100) and the default subnet mask
is 255.255.255.0.
Logging in to the Industrail Modbus Gateway
1. Use Internet Explorer 8.0 or above Web browser and enter IP address http://192.168.0.100 to access the
Web interface.
2. When the following dialog box appears, please enter the default user name and password “admin”. The
login screen in Figure 3-4 appears.
Default Username: admin
Default Password: admin

User’s Manual of IMG-120T
-20-
Figure 3-4: Web Login Screen
After entering the username and password, the main screen appears as Figure 3-5 shows.
Figure 3-5: Web Main Screen of Industrial Modbus Gateway
For security reason, please change and memorize the new password after this first setup.
1. Only accept command in lowercase letter under web interface.