MG-120
2-port RS232/422/485 Modbus Gateway
Serial Interface
• Two DB9 interfaces support RS232, 2-wire RS485, 4-wire
RS485 and RS422 standards
• Asynchronous serial data rates up to 921600bps
Ethernet Interface
• 1-port 10/100BASE-TX RJ45 with auto MDI/MDI-X function
Standard Modbus TCP/RTU/ASCII Network Integration
PLANET MG-120 2-port RS232/422/485 Modbus Gateway supports the standard
Modbus Protocol, which makes it possible for converting any Modbus Protocols
Management Function
between Modbus TCP, Modbus RTU, and Modbus ASCII for all supported
• Built-in IP-based Web interface and telnet interface for
hardware interfaces. Its serial protocol can be used for industrial automation where
remote management
SCADA or HMI system is in place.
• Software Protocol supports Modbus TCP, Modbus RTU,
Moreover, its network integration can be upgraded from the SNMP network to the
Modbus ASCII, IP, ARP, DHCP and DNS
automated Modbus TCP network, which brings interconnection over Ethernet longer
• Supports RTU Master, RTU Slave, ASCII Master, and
distances, thus making a network infrastructure more flexible.
ASCII Slave four serial operation modes via management
interface
• Master mode supports 32 TCP slave connection requests
• Slave mode supports 32 TCP master connections
• PLANET Modbus Gateway utility for finding client device
on the network
• PLANET Smart Discovery utility automatically finds the
client devices on the network
A Conversion Bridge for Flexible Network Deployment • Firmware upgrade/configuration backup and restore via
The MG-120 can be a conversion bridge between the equipment with the Modbus HTTP protocol
RTU/ASCII Protocol and the administrator workstations that run the Modbus TCP/IP
Protocol. The RS232/422/485 serial interface of the MG-120 provides the Modbus
Case and Installation
RTU/ASCII operation mode and various baud rate options to meet the demand
• -10 to 60 degrees C operating temperature
of integration between the Modbus TCP/IP Protocol, Modbus RTU Master/Slave
Protocol and Modbus ASCII Master/Slave Protocol. • Reset button for resetting to factory default
RJ45
LNK/ACT 100
5V , 2A max.
Modbus TCP/IP Ethernet Reset
RS232/RS422/RS485
Modbus TCP/IP Serial Cable Modbus
RS232/422/485
10/100TX UTP Equipment
Workstation
with SCADA MG-120
RTU ASCII RTU ASCII
Slave Slave Master Master
32 TCP Masters 32 TCP Slaves
100BASE-TX UTP
RS232/422/485
RS485 RS232/RS422/RS485
1
MG-120
The advantage of having the MG-120 is to assist users to build an environment between the Modbus TCP Protocol and the Modbus RTU/ASCII Protocol
easily, thus offering an application solution to the control equipment without Ethernet ports, and the control equipment can only control through a PC
workstation or control panel.
In addition, the effective integration solution of Modbus Ethernet devices, Modbus serial equipment or multi Modbus master / slave in a hybrid network brings
the following:
■ Master mode supports up to 32 TCP slave connection requests
■ Slave mode supports up to 32 TCP master connections
Differences between Serial Devices and Modbus Gateway
Serial Devices Server
VCOM Utility +
1:1
Serial Virtual
Application COM port
Serial Port
RJ45 UTP (RS232/422/485)
ICS-110
Serial Device
Modbus Gateway
1 : 32
Modbus TCP
Application/
SCADA Serial Port
RJ45 UTP (RS232/422/485)
MG-110
ID1~32
Modbus RTU/ASCII
Serial Devices
Remote Management
The MG-120 makes the connected Modbus RTU/ASCII equipment become IP-based facilities and is able to connect to the Modbus TCP/IP network via
its R232/422/485 serial interface and 10/100BASE-TX RJ45 Ethernet port. It provides a remote web management and telnet Interface for efficient remote
network management. The MG-120 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 MG-120.
Remote Management
RJ45
LNK/ACT 100
5V , 2A max.
Reset
MB VCOM Utility
TCP/IP
Telnet
MG-120
Modbus Gateway Series
Web Browser
Modbus Serial Port State Monitoring
The MG-120 shows the details of the total bytes transmitted and received on the RS232/422/485 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
MG-120 via the single RS232/422/485 serial interface.
2
MG-120
Applications
RTU/ASCII Master to Multi Modbus TCP/IP Slaves
The MG-120 can act as a bridge between the RTU/ASCII master equipment and the multi-TCP/IP slave equipment in a Modbus TCP/IP networking
environment to control multi-TCP/IP slave equipment via the RTU/ASCII master equipment..
RTU/ASCII Master to Multi Modbus TCP/IP Slaves
MG-120
RS485 Modbus Gateway
HMI
RTU/ASCII Master
Modbus TCP/IP
Slave Devices
DCS DCS
100BASE-TX UTP
RS485 RS485
Multi Modbus TCP/IP Master to RTU/ASCII Slaves
The MG-120 can operate as a bridge between the multi-TCP/IP master equipment and the RTU/ASCII slave equipment in a Modbus TCP/IP networking
environment to control the RTU/ASCII slave equipment via the multi-TCP/IP master equipment.
Multi Modbus TCP/IP Master to RTU/ASCII Slaves
Host Computer Modbus TCP
Master Devices
Modbus TCP Master PLC
MG-120 MG-115A
Modbus Gateway Modbus Gateway
RS485 RS485 RS485
Flow Meters (Drive) Flow Meters (Drive) Modbus/RTU Modbus/ASCII
Slave Devices
100BASE-TX UTP
RS485 RS485
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MG-120
Product Specifications
Product MG-120
Serial Interface
Serial Ports 2 x DB9 male
RS232
RS422
Serial Standards
4-wire RS485
2-wire RS485
Baud Rate (Data Rate) 50bps to 921Kbps
Data Bits 5, 6, 7, 8
Stop Bit 1, 1.5, 2
Parity Type Odd, Even, None, Space, Mark
RTS/CTS and DTR/DSR (RS232 only)
Flow Control
XON/XOFF
RS232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND
RS422: Tx+, Tx-, Rx+, Rx-, GND
Signals
4-wire RS485: Tx+, Tx-, Rx+, Rx-, GND
2-wire RS485: Data A (+), Data B (-), GND
Pin Assignment
RTU Master/RTU Slave/ASCII Master/ASCII Slave
Operation Mode Master mode: Supports up to 32 TCP slave connection requests
Slave mode: Supports up to 32 TCP master connection requests
Ethernet Interface
Ethernet Ports 1 x RJ45
Standard 10/100BASE-TX
Distance 100m
ESD Protection 6KV
Hardware
Installation DIN-rail kit and wall-mount ear
Dimensions (W x D x H) 97 x 70 x 26mm
Weight 189 g
System: Link
LED Indicators TP Port: Link/Active
Serial Port: Active
Power Requirements External Power Adaptor 5V DC, 2A max.
Power Consumption 5.5 watts (max)
Enclosure Metal
< 5 sec: System reboot
Reset Button
> 5 sec: Factory default
Management
Web management
Telnet Console management
Windows-based MB VCOM Utility management
Management Interfaces
SNMPv1, v2c / SNMP Trap
UNI-NMS monitoring
PLANET Smart Discovery Utility
IP Version IPv4
RTU Master
RTU Slave
Operation Mode
ASCII Master
ASCII Slave
4
MG-120
Windows-based Only:
Windows XP
Windows Server 2003
Windows 7
Virtual COM Utility Platform Supports
Windows Server 2008
Windows 8 (Must install the latest version of WinPcap)
Windows Server 2012 (Must install the latest version of WinPcap)
Windows 10
Fault Alarm Record: System log / SNMP trap
Time NTP
Security Accessible IP (white list)
SNMP SNMP v1 and v2c
Standards Conformances
FCC Part 15 Class A,
Regulatory Compliance
CE Certification Class A
IEEE 802.3 10BASE-T
IEEE 802.3u 100BASE-TX
RFC 768 UDP
RFC 793 TFTP
RFC 791 IP
RFC 792 ICMP
Standards
RFC 854 Telnet
RFC 958 NTP
RFC 1908 SNMPv2c
RFC 2068 HTTP
RFC 2131 DHCP Client
EIA/TIA RS232/422/485
Regulatory Approval RoHS
Environment
Operating Temperature -10 ~ 60 degrees C
Storage Temperature -10 ~ 70 degrees C
Humidity 5 ~ 95% (non-condensing)
5
MG-120
Dimensions
• MG-120
26.20
RS232/422/485 Modbus Gateway
MG-120
100
LNK/ACT
P1
Reset
70.30
RS232/422/485 Modbus Gateway
x x
/R x/R PWR
P2
, 2A max.
Tx T
P1 P2
5V
94.00
46.70
�
7.0
0
Unit: mm
Ordering Information
MG-120 2-port RS232/422/485 Modbus Gateway (-10~60 degrees C)
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MG-120
Related Products
MG-110 1-port RS232/422/485 Modbus Gateway (-10~60 degrees C)
MG-115A 1-port RS232/422/485 Modbus Gateway with 1-port 100BASE-FX SFP (-10~60 degrees C)
IMG-2100T IP30 Industrial 1-Port RS232/RS422/RS485 Modbus Gateway (1 x 10/100TX, -40~75 degrees C)
IMG-2105AT IP30 Industrial 1-Port RS232/RS422/RS485 Modbus Gateway (1 x 100FX, -40~75 degrees C)
IMG-2200T IP30 Industrial 2-Port RS232/RS422/RS485 Modbus Gateway (2 x 10/100TX, -40~75 degrees C, 2KV isolation)
IP30 Industrial 4-Port RS232/RS422/RS485 Modbus Gateway (2 x 10/100TX, -40~75 degrees C, 2KV isolation,
IMG-2400T
2 x DI + 2 x DO)
PLANET Technology Corporation
11F., No.96, Minquan Rd., Xindian Dist., New Taipei City 231, MG-120
Taiwan (R.O.C.)
PLANET reserves the right to change specifications without prior notice. All brand names and trademarks are property of
Tel: 886-2-2219-9518 Fax: 886-2-2219-9528 their respective owners. Copyright © 2020 PLANET Technology Corp. All rights reserved.
Email: sales@planet.com.tw www.planet.com.tw
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