, , , ,

MG-115A – 1-port RS232/422/485 Modbus Gateway with 1-Port 100BASE-FX SFP


  • 1-port RS232/422/485 Modbus Gateway with 1-Port 100BASE-FX SFP
  • One DB9 interface supports RS232, 2-wire RS485, 4-wire RS485 and RS422 standards
  • Asynchronous serial data rates up to 921600bps
  • 1-port 100BASE-FX SFP
  • Built-in IP-based Web interface and telnet interface for remote management
  • -10 to 60 degrees C operating temperature


Warranty: 36 Months

Standard Modbus TCP/RTU/ASCII Network Integration

PLANET MG-115A 1-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-115A 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-115A 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-115A 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 slave TCP connection requests
  • Slave mode supports up to 32 TCP master connections

Remote Management 

The MG-115A 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 100BASE-FX Ethernet port. It provides a remote web management and telnet Interface for efficient remote network management. The MG-115A 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-115A.

Modbus Serial Port State Monitoring

The MG-115A 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-115A via the single RS232/422/485 serial interface.

Fiber-optic Link Capability Extends the Range of Network Deployment

The maximum distance between two IP devices via Ethernet UTP cable is 100 meters. To flexibly extend the deployment range of Modbus gateway, the MG-115A’s SFP slot supporting 100BASE-FX SFP modules, and more can reach a transmission distance of up to 120km.

Easy Chassis Installation

The MG-115A can be used as a stand-alone unit or as a slide-in module to the PLANET Media Converter Chassis (MC-700 and MC-1500 chassis). The media chassis can assist in providing DC power to the MG-115A and can be DIN-rail or wall mounted for efficient use of cabinet space, without the need of replacing the existing serial equipment and software system.

Serial Interface
Serial Ports1 x DB9 male
Serial StandardsRS232
4-wire RS485
2-wire RS485
Baud Rate (Data Rate)50bps to 921Kbps
Data Bits5, 6, 7, 8
Stop Bit1, 1.5, 2
Parity TypeOdd, Even, None, Space, Mark
Flow ControlRTS/CTS and DTR/DSR (RS232 only)
SignalsRS232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND
RS422: Tx+, Tx-, Rx+, Rx-, GND
4-wire RS485: Tx+, Tx-, Rx+, Rx-, GND
2-wire RS485: Data A (+), Data B (-), GND
Pin Assignment
Operation ModeRTU Master/RTU Slave/ASCII Master/ASCII Slave
Master mode: Supports up to 32 slave TCP connection requests
Slave mode: Supports up to 32 master TCP connection requests
Ethernet Interface
Ethernet Ports1 x SFP
Distance2km to 120km, Vary on SFP modules
Switch ArchitectureStore-and-Forward
ESD Protection6KV
InstallationDIN-rail kit and wall-mount ear
Dimensions (W x D x H)97 x 70 x 26mm
LED IndicatorsSystem: Link
TP Port: Link/Active
Serial Port: Active
Power RequirementsExternal Power Adaptor 5V DC / 2A max.
Power Consumption5.5 watts (max)
Reset Button< 5 sec: System reboot > 5 sec: Factory default
Compatible Media Converter ChassisMC-700/MC-1500/MC-1500R
Management InterfacesWeb management
Telnet Console management
Windows-based MB VCOM Utility management
SNMPv1, v2c / SNMP Trap
UNI-NMS monitoring
PLANET Smart Discovery Utility
IP VersionIPv4
Operation ModeRTU Master
RTU Slave
ASCII Master
Virtual COM Utility Platform SupportsWindows-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 AlarmRecord: System log / SNMP trap
SecurityAccessible IP (white list)
SNMPSNMP v1 and v2c
Standards Conformances
Regulatory ComplianceFCC Part 15 Class A,
CE Certification Class A
Stability TestingIEC60068-2-32 (Free fall)
IEC60068-2-27 (Shock)
IEC60068-2-6 (Vibration)
StandardsIEEE 802.3u 100BASE-FX
RFC 791 IP
RFC 854 Telnet
RFC 1908 SNMPv2c
RFC 2131 DHCP Client
EIA/TIA RS232/422/485
Regulatory ApprovalRoHS
Operating Temperature-10 ~ 60 degrees C
Storage Temperature-10 ~ 70 degrees C
Humidity5 ~ 95% (non-condensing)


Based on 0 reviews

0.0 overall

Only logged in customers who have purchased this product may leave a review.

There are no reviews yet.

Do you have a question?

Drop us a line by compiling the form below. We will be more than happy to reply to any of your questions!

    Please prove you are human by selecting the Heart.

    Planet MG-115A Datasheet


    You may also like…