Free Modbus Tester by PowerHud

Modbus Tester is a free utility that provides test and debug capabilities for your slave devices. Multiple instances can run on multiple slave devices simultaneously.

PowerHud Modbus Tester supports Modbus Read/Write operations, enabling users to write to and read registers on slave devices. It offers major functions for these operations.

The software supports various communication protocols including Modbus RTU, Modbus TCP/IP, Modbus RTU Over TCP/IP, Modbus UDP/IP, and Modbus RTU Over UDP/IP. Additionally, it provides a live chart option where values read from the devices can be added to chart series, allowing users to monitor them in real-time.

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Modbus Tester
Modbus Tester

Modbus Tester is a free utility that provides test and debug capabilities for your slave devices. Multiple instances can run on multiple slave devices simultaneously.

PowerHud Modbus Tester supports Modbus Read/Write operations, enabling users to write to and read registers on slave devices. It offers major functions for these operations.

The software supports various communication protocols including Modbus RTU, Modbus TCP/IP, Modbus RTU Over TCP/IP, Modbus UDP/IP, and Modbus RTU Over UDP/IP. Additionally, it provides a live chart option where values read from the devices can be added to chart series, allowing users to monitor them in real-time.

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Modbus LogoWhat is Modbus?

 

Modbus is a widely used communication protocol in industrial automation. It facilitates communication between devices such as programmable logic controllers (PLCs), sensors, and other industrial equipment. Developed in 1979 by Modicon (now Schneider Electric), Modbus has since become a standard for connecting industrial electronic devices.

 

At its core, Modbus is a master-slave protocol, meaning one device (the master) initiates and controls communication with one or more devices (the slaves). The master sends requests to read or write data to specific memory locations in the slaves, which then respond accordingly.

 

There are two primary variants of Modbus:

 

Modbus RTU (Remote Terminal Unit): This variant uses serial communication (usually RS-232 or RS-485) and is known for its simplicity and efficiency. It transmits data in binary format, making it suitable for applications where high noise immunity is required.

 

Modbus TCP/IP (Transmission Control Protocol/Internet Protocol): This variant utilizes Ethernet networks, allowing communication over local area networks (LANs) or the internet. Modbus TCP/IP encapsulates Modbus RTU frames within TCP/IP packets, enabling communication between devices connected to the same network.

 

Modbus employs a client-server architecture, where the client (master) initiates transactions by sending requests to read or write data, and the server (slave) responds accordingly. Each device on the network has a unique address, allowing the master to identify and communicate with specific slaves.

 

Modbus supports various data types, including integers, floating-point numbers, and discrete inputs/outputs. It also provides functions for reading and writing coils (digital outputs), discrete inputs (digital inputs), holding registers (analog outputs), and input registers (analog inputs).

 

Due to its simplicity, reliability, and widespread adoption, Modbus remains a popular choice for industrial communication, particularly in supervisory control and data acquisition (SCADA) systems, process automation, and monitoring applications.

 

With the free PowerHud Modbus Tester, you can connect to your Modbus slave devices, check their connections, or modify settings.
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