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Industrial 1-port RS422/485 Modbus Gateway


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Economic Solution for Industrial Modbus TCP/RTU/ASCII Network Integration
PLANET has added the Industrial Modbus TCP/IP Protocol to industrial management level products to provide its easily-integrated industrial management level products with SCADA/HMI system and other data acquisition systems in factory floors. Moreover, the industrial IT SNMP network is upgraded to the Industrial automation Modbus TCP/IP network. PLANET industrial management level products with the Modbus TCP/IP Protocol offer flexible network connectivity solution for industrial automation environment. To complete the industrial automation environment application solution, PLANET has announced a first industrial level 1-port RS422/485 Modbus Gateway — IMG-110T, a bridge that converts 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 IP30 metal housing.

Modbus TCP/IP for Modbus RTU/ASCII Network Environment Deployment
The IMG-110T can be a conversion bridge between the industrial equipment with the Modbus RTU/ASCII Protocol and the administrator workstations that run the Modbus TCP/IP Protocol. The RS422/485 serial interface of the IMG-110T 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-110T 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 and the industrial control equipment can only control through an industrial PC workstation or industrial control panel.

In addition, the effective integration solution 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-110T 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-110T 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-110T.

Modbus Serial Port State Monitoring
The IMG-110T 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-110T via the single RS422/485 serial interface.

Stable Performance in Hardened Environment Design
The IMG-110T 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-110T to be placed in almost any difficult environment.

The IMG-110T is equipped with a compact IP30-rated metal case that allows wall mounting for efficient use of cabinet space. The IMG-110T also provides an integrated power supply source with wide-ranging voltages (9 to 48V DC) ideally suitable for worldwide operation with high availability applications.


RTU/ASCII Master to Multi Modbus TCP/IP Slaves
The IMG-110T can 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.

Multi Modbus TCP/IP Master to RTU/ASCII Slaves
The IMG-110T 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.

Key Features

Serial Interface

  • One RS422/485 port 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

Management 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
  • 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
  • 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


  • 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

  • Wallmount-type IP30 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


Serial Port
Interface RS422/RS485 x 1
Connector 5-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
Fast 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
Copper Port 10/100BASE-T RJ45 TP x1, auto-MDI/MDI-X, auto-negotiation
Serial Port RS422/RS485 x 1
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 1, RX (Receive) x 1
Operation Mode RTU Master
RTU Slave
ASCII Master
Dimension (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 1.61 watts/5.4BTU (max.)
Installation Wall-mount kit
Mechanical Metal
Standards Conformance
Standards Compliance IEEE 802.3 10BASE-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 IEC60068-2-32 (free fall)
IEC60068-2-27 (shock)
IEC60068-2-6 (vibration)
Temperature Operating: -40~75 degrees C
Storage: -40~75 degrees C
Humidity Operating: 5~95% (non-condensing)
Storage: 5~95% (non-condensing)
*Remarks Please follow the DC power input symbol from the front panel of the IMG-110T
— insert positive DC power wire into V+, and negative DC power wire into V-. Otherwise, it will damage the device.