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Modbus Topology

Modbus Gateway -Modbus is the most common Industrial protocol and most PLC, Controllers, and industrial software can communicate via this protocol. 

What is a Modbus Gateway?

A Modbus Gateway enables seamless PLC communication and device connectivity by linking serial devices with Industrial Ethernet in modern industrial automation systems. It supports SCADA systems, HMI integration, and data acquisition systems for reliable supervisory control and process automation. As an Industrial IoT gateway, it also enables remote monitoring, OPC UA integration, and edge computing for smarter factory and building automation.



What we propose to our customers

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01

Modbus to serial server

Modbus RS232 RS485 to Wifi Ethernet Server

02

Modbus Tcp to RTU

Tiny Modbus TCP to RTU/ASCII Gateway with PoE and 1-port RS-232/422/485

03

RS485 to Modbus ethernet converter

RS485 RS232 to Ethernet Converter Modbus to Ethernet Modbus RTU to TCP Gateway Serial Device Server Dual Serial Ports

04

Modbus rs485

Tiny Modbus TCP to RTU/ASCII Gateway with PoE and 2-port RS-485

Choosing the Right Modbus Gateway for Your Application

Modbus rtu

Modbus TCP to RTU Gateway

Converts between Modbus TCP (Ethernet-based) and Modbus RTU (serial-based). This is probably the most common type you'll encounter. It's perfect for bringing serial devices onto your plant network.

Modbus remote monitoring

Modbus to Ethernet Gateway

Allows serial Modbus devices to communicate over standard Ethernet infrastructure. This simplifies your industrial communication network and often reduces wiring costs.

Modbus protocol converter

Protocol Converter Gateway

Surpasses Modbus by transforming multiple industrial protocols. These tools are adaptable for complex automation systems.  

Wireless Modbus connection

Wireless Modbus Gateway

Provides wireless connectivity for Modbus devices, eliminating cable runs in difficult installations. Particularly useful for remote monitoring applications or retrofit projects.


Key Features of Industrial Modbus Gateways
1

Number of devices

How many Modbus slaves do you need to connect? Some gateways support just a handful, while others can handle hundreds of devices simultaneously.

2

Communication speed

Your baud rate requirements matter. Most modern gateways handle standard speeds, but high-speed applications need careful consideration.

3

Environmental conditions

Industrial environments can be harsh. Look for gateways with appropriate IP ratings, temperature ranges, and vibration resistance for your specific application. 

4

Power supply options

Will you need PoE capability, or do you have industrial power supplies available? Some gateways offer flexible power input options. 


Oil & Gas Industry

Remote Wellhead Monitoring In upstream operations, wireless Modbus gateways connect pressure sensors, flow meters, and valve controllers at remote well sites. These gateways transmit data back to central control rooms, often over cellular networks, eliminating the need for daily manual checks.

Pipeline SCADA Systems Pipeline operators use Modbus gateways to integrate pump stations, compressor facilities, and leak detection systems across hundreds of miles. The gateways convert serial Modbus data from field instruments into protocols that SCADA systems can process efficiently.

Tank Farm Management Refineries and storage facilities deploy Modbus gateways to monitor tank levels, temperature stratification, and product quality parameters. This real-time data helps prevent overfills and ensures product specifications are maintained.



Water & Wastewater Treatment

Pump Station Control Municipal water systems rely on Modbus gateways to remotely control and monitor lift stations scattered across service areas. Operators can adjust pump speeds, track runtime hours, and receive alarms when wet well levels exceed safe thresholds.

Treatment Process Optimization Water treatment plants use gateways to connect pH sensors, chlorine analyzers, and turbidity meters to centralized control systems. This integration enables automated dosing adjustments and ensures water quality compliance.

Distributed Sensor Networks Wastewater facilities install Modbus gateways to aggregate data from flow meters, level sensors, and dissolved oxygen probes throughout the treatment process. This comprehensive monitoring improves efficiency and helps meet environmental regulations.


Building Automation & Smart Buildings

HVAC System Integration Commercial buildings use Modbus gateways to connect chillers, air handling units, and variable air volume boxes to building management systems (BMS). This allows facility managers to optimize comfort while minimizing energy consumption.

Lighting Control Networks Modern office buildings integrate Modbus-based lighting controllers with occupancy sensors and daylight harvesting systems through gateways. This creates intelligent lighting zones that adapt to actual usage patterns.

Energy Management Systems Building operators deploy Modbus gateways to collect data from electricity meters, BTU meters, and submetering equipment. This granular energy data helps identify waste and supports green building certifications like LEED.



Power Generation & Distribution

Substation Automation Electrical utilities use Modbus gateways in substations to integrate protective relays, circuit breakers, and transformer monitors. These gateways enable remote operation and provide crucial data for grid management.

Solar Farm Monitoring Renewable energy facilities connect inverters, weather stations, and combiner boxes through Modbus gateways. This allows operators to track energy production, identify underperforming panels, and optimize array performance.

Battery Energy Storage Systems Grid-scale battery installations use gateways to monitor cell voltages, temperatures, and state-of-charge across thousands of individual cells, ensuring safe and efficient operation.


                Real-World Industrial Applications of Modbus Gateway

About our Product line

tgw-712

Tiny Modbus TCP to RTU/ASCII Gateway with PoE and 1-port RS-232 (DB-9 Male Connector)

The tGW-700 is a Modbus TCP to RTU/ASCII gateway that enables a Modbus TCP host to communicate with serial Modbus RTU/ASCII devices through an Ethernet network, and eliminates the cable length limitation of legacy serial communication devices. The module can be used to create a pair-connection application (as well as serial-bridge or serial-tunnel application), and can then route data over TCP/IP between two serial Modbus RTU/ASCII devices, which is useful when connecting mainframe computers, servers or other serial devices that use Modbus RTU/ASCII protocols and do not themselves have Ethernet capability.

  • Supports Modbus TCP/UDP master and slave
  • Supports Modbus RTU/ASCII master and slave
  • Max. TCP connections (masters) per serial port: 32
  • Read-cache ensures faster Modbus TCP/UDP response
  • Supports UDP responder for device discovery (UDP Search)
  • Static IP or DHCP network configuration
  • Tiny Web server for configuration (HTTP)
  • Male DB-9 connector for easy wiring
  • Cost-effective Modbus gateway

  Application:​

Modbus Connectivity

tgw-732

Tiny Modbus TCP to RTU/ASCII Gateway with PoE and 3-port RS-232

The tGW-700 is a Modbus TCP to RTU/ASCII gateway that enables a Modbus TCP host to communicate with serial Modbus RTU/ASCII devices through an Ethernet network, and eliminates the cable length limitation of legacy serial communication devices. The module can be used to create a pair-connection application (as well as serial-bridge or serial-tunnel application), and can then route data over TCP/IP between two serial Modbus RTU/ASCII devices, which is useful when connecting mainframe computers, servers or other serial devices that use Modbus RTU/ASCII protocols and do not themselves have Ethernet capability.

  • Supports Modbus TCP/UDP master and slave
  • Supports Modbus RTU/ASCII master and slave
  • Max. TCP connections (masters) per serial port: 32
  • Read-cache ensures faster Modbus TCP/UDP response
  • Supports UDP responder for device discovery (UDP Search)
  • Static IP or DHCP network configuration
  • Tiny Web server for configuration (HTTP)
  • Cost-effective Modbus gateway

  Application:​

Modbus gateway in dubai

tgw-725

Tiny Modbus TCP to RTU/ASCII Gateway with PoE and 2-port RS-485

The tGW-700 is a Modbus TCP to RTU/ASCII gateway that enables a Modbus TCP host to communicate with serial Modbus RTU/ASCII devices through an Ethernet network, and eliminates the cable length limitation of legacy serial communication devices. The module can be used to create a pair-connection application (as well as serial-bridge or serial-tunnel application), and can then route data over TCP/IP between two serial Modbus RTU/ASCII devices, which is useful when connecting mainframe computers, servers or other serial devices that use Modbus RTU/ASCII protocols and do not themselves have Ethernet capability.

  • Supports Modbus TCP/UDP master and slave
  • Supports Modbus RTU/ASCII master and slave
  • Max. TCP connections (masters) per serial port: 32
  • Read-cache ensures faster Modbus TCP/UDP response
  • Supports UDP responder for device discovery (UDP Search)
  • Static IP or DHCP network configuration
  • Tiny Web server for configuration (HTTP)
  • Allows automatic RS-485 direction control
  • Terminal block connector for easy wiring
  • Cost-effective Modbus gateway

  Application:​

Modbus solution

tgw-718

Tiny Modbus TCP to RTU/ASCII Gateway with PoE and 1-port RS-232/422/485

The tGW-700 is a Modbus TCP to RTU/ASCII gateway that enables a Modbus TCP host to communicate with serial Modbus RTU/ASCII devices through an Ethernet network, and eliminates the cable length limitation of legacy serial communication devices. The module can be used to create a pair-connection application (as well as serial-bridge or serial-tunnel application), and can then route data over TCP/IP between two serial Modbus RTU/ASCII devices, which is useful when connecting mainframe computers, servers or other serial devices that use Modbus RTU/ASCII protocols and do not themselves have Ethernet capability.

  • Supports Modbus TCP/UDP master and slave
  • Supports Modbus RTU/ASCII master and slave
  • Max. TCP connections (masters) per serial port: 32
  • Read-cache ensures faster Modbus TCP/UDP response
  • Supports UDP responder for device discovery (UDP Search)
  • Static IP or DHCP network configuration
  • Tiny Web server for configuration (HTTP)
  • Allows automatic RS-485 direction control
  • Terminal block connector for easy wiring
  • Cost-effective Modbus gateway

  Application:​

Modbus devices

Frequently asked questions

Here are some common questions about our company.

Yes, Modbus can be connected to Wi-Fi by using a Modbus Wi-Fi gateway or a Wi-Fi IO module. These devices convert Modbus RTU (serial) or Modbus TCP data into wireless communication, allowing easy integration with SCADA systems, PLCs, and Industrial IoT platforms. This setup enables remote monitoring, flexible factory floor connectivity, and reduced wiring in industrial and building automation environments.

The maximum distance for Modbus RTU over RS-485 serial communication is typically up to 1,200 meters (about 4,000 feet) under standard conditions. This distance depends on cable quality, baud rate, proper termination, and network topology. Lower baud rates and correct shielding help maintain reliable communication across long industrial networks.

A Modbus gateway can typically connect up to 247 devices on a Modbus RTU (RS-485) network, since Modbus device addresses range from 1 to 247. The actual number of connected devices depends on factors like baud rate, polling speed, cable length, and network topology. For Modbus TCP, the limit is usually higher and mainly constrained by the gateway’s hardware capacity and network performance.

Modbus itself is not inherently secure, as it was designed for trusted industrial networks and does not include encryption, authentication, or access control. However, it can be made suitable for industrial applications by using secure gateways, network segmentation, firewalls & VPN .When properly secured, Modbus is widely and safely used in SCADA systems, industrial automation, and process control environments

Yes, old (legacy) equipment can be integrated with a new SCADA system using protocol converters and industrial gateways. Devices like Modbus, RS-485, or fieldbus gateways translate legacy serial communication into modern Industrial Ethernet or OPC UA, making the data compatible with current SCADA platforms. This approach enables remote monitoring, data acquisition, and supervisory control without replacing existing machines, reducing cost and downtime.

By supporting multiple industrial protocols and Industrial Ethernet, a Modbus gateway simplifies process automation, data acquisition, and HMI integration. It also enables remote monitoring and Industrial IoT readiness, helping your facility operate more efficiently, securely, and future ready.