C program for measuring Modbus data transfer rate through libmodbus library

Function Overview

This tool aims to measure data transmission rate by continuously sending Modbus requests and recording response time. It supports two main Modbus modes: TCP and RTU, and users can choose which mode to use for testing through command-line parameters. This program calculates the data transmission rate by measuring the number of successfully read data points within a specified time, and displays the results in two units: points/second and KiB/second, providing users with an intuitive performance metric.

Program Structure and Implementation

The program subject ismainfunction, which selects the backend (TCP or RTU) for testing and the number of loops to execute based on user input. For TCP connections, it attempts to connect to a specific port on the local host; For RTU mode, communication is conducted through the serial port. After successful connection, the program will allocate memory to store Modbus status and register values, and begin the testing sequence. The performance testing process of

includes three main stages: reading bits, reading registers, and writing/reading registers. At each stage, the program performs a large number of Modbus operations to collect sufficient data for effective performance analysis.

The testing consists of three main stages: reading bits, reading registers, and writing/reading registers. At each stage, the program performs a large number of Modbus operations to collect sufficient data for effective performance analysis.

1. Read Bit- Test the performance of bit operations by continuously reading Modbus bits (digital input and output).
2. Read Register- Test the efficiency of register operations by continuously reading Modbus registers (similar to analog input and hold registers).
3. Write Read Register- Read the register immediately after performing a write operation to test the performance of the combination operation. After each test, the program calculates and displays the data transfer rate (the number of data points and KiBs transmitted per second), as well as the time required for the entire testing process.

After each test, the program calculates and displays the data transfer rate (the number of data points and KiBs transferred per second), as well as the time required for the entire testing process.

Result Output

The output of the program provides detailed information about the performance of Modbus operations, including the duration of the operation, the total number of bytes, and the calculated data transfer rate. These data help users understand the efficiency of performing Modbus operations in specific hardware and network settings. In addition, the program also calculates the total number of bytes, including Modbus TCP protocol overhead, which is particularly important for evaluating network load and optimizing network performance.

In addition, the program also calculates the total number of bytes, including Modbus TCP protocol overhead, which is particularly important for evaluating network load and optimizing network performance.

Usage Scenarios and Value

This performance measurement tool is highly valuable for engineers developing or deploying Modbus based systems. It can not only help them validate and optimize system configurations to ensure the required performance standards are met in production environments, but also assess potential performance bottlenecks before system upgrades or expansions. Through this approach, engineers can more effectively manage the maintenance and upgrades of Modbus systems, ensuring that all operations can run under optimal performance conditions.

Through this approach, engineers can more effectively manage the maintenance and upgrades of Modbus systems, ensuring that all operations can run under optimal performance conditions.