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Planet MG-120 2-port RS232/422/485 Modbus Gateway


Available on backorder

Model No: MG-120

  • Two DB9 interfaces support RS232, 2-wire RS485, 4-wire RS485 and RS422 standards
  • Asynchronous serial data rates up to 921600bps
  • 1-port 10/100BASE-TX RJ45 with auto MDI/MDI-X function
  • Built-in IP-based Web interface and telnet interface for remote management
  • Software Protocol supports Modbus TCP, Modbus RTU, Modbus ASCII, IP, ARP, DHCP and DNS


Available on backorder

Warranty: 36 Months

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 between Modbus TCP, Modbus RTU, and Modbus ASCII for all supported hardware interfaces. Its serial protocol can be used for industrial automation where SCADA or HMI system is in place.

Moreover, its network integration can be upgraded from the SNMP network to the automated Modbus TCP network, which brings interconnection over Ethernet longer distances, thus making a network infrastructure more flexible.

A Conversion Bridge for Flexible Network Deployment

The MG-120 can be a conversion bridge between the equipment with the Modbus 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 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 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

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.

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.

Serial Interface
Serial Ports 2 x DB9 male
Serial Standards RS232
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
Flow Control RTS/CTS and DTR/DSR (RS232 only)
Pin Assignment
Pin RS232 RS422
1 DCD TxD+
2 RxD TxD-
3 TxD RxD- Data-
4 DTR RxD+ Data+
Operation Mode RTU Master/RTU Slave/ASCII Master/ASCII Slave
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
Installation DIN-rail kit and wall-mount ear
Dimensions (W x D x H) 97 x 70 x 26mm
Weight 189 g
LED Indicators System: Link
TP Port: Link/Active
Serial Port: Active
Power Requirements External Power Adaptor 5V DC, 2A max.
Power Consumption 5.5 watts (max.)
Enclosure Metal
Reset Button < 5 sec: System reboot
> 5 sec: Factory default
Management Interfaces Web management
Telnet Console management
Windows-based MB VCOM Utility management
SNMPv1, v2c / SNMP Trap
UNI-NMS monitoring
PLANET Smart Discovery Utility
IP Version IPv4
Operation Mode RTU Master
RTU Slave
ASCII Master
Virtual COM Utility Platform Supports Windows-based Only:
Windows XP
Windows Server 2003
Windows 7
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 Conformance
Regulatory Compliance FCC Part 15 Class A,
CE Certification Class A
Standards IEEE 802.3 10BASE-T
IEEE 802.3u 100BASE-TX
RFC 791 IP
RFC 854 Telnet
RFC 1908 SNMPv2c
RFC 2131 DHCP Client
EIA/TIA RS232/422/485
Regulatory Approval RoHS
Operating Temperature -10 ~ 60 degrees C
Storage Temperature -10 ~ 70 degrees C
Humidity 5 ~ 95% (non-condensing)

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