Modbus device simulator supporting both TCP and RTU protocols. Create virtual industrial devices for testing, development, and training with real-time data simulation and event logging.
Modbus Digital Twin Simulator creates virtual industrial devices that behave like real Modbus equipment. It supports both Modbus TCP for Ethernet networks and Modbus RTU for serial communications, enabling testing without physical hardware.
Used for development environments, training scenarios, and system integration testing. The simulator provides implementation of all standard Modbus function codes with real-time data simulation and event logging for debugging and monitoring.
Modbus simulation for industrial testing
Implementation of both Modbus TCP for Ethernet networks and Modbus RTU for serial communications with protocol compliance.
Implementation of all standard Modbus function codes including read/write operations for coils, discrete inputs, and registers.
Modbus memory model with configurable sizes for coils, discrete inputs, holding registers, and input registers.
Dynamic data simulation with realistic sensor values, alarm conditions, and equipment behavior patterns for authentic testing scenarios.
How Modbus Digital Twin powers industrial development
The Problem: Integration teams need to test SCADA systems, HMI software, and data acquisition systems without access to physical hardware or during early development phases.
How Modbus Digital Twin Helps: Creates realistic virtual devices that mimic industrial equipment behavior. Teams can test communication protocols, data validation, alarm handling, and system responses before hardware is available.
The Problem: Developers building Modbus client applications need reliable test servers that respond correctly to various scenarios including error conditions and edge cases.
How Modbus Digital Twin Helps: Provides a programmable test environment with controllable data, error injection capabilities, and comprehensive logging. Developers can test error handling, timeout scenarios, and data validation.
The Problem: Educational institutions and corporate training programs need safe, repeatable environments for teaching industrial communication protocols without risking actual equipment.
How Modbus Digital Twin Helps: Creates realistic industrial scenarios for hands-on learning. Students can practice protocol analysis, troubleshooting, and system configuration in a controlled environment with predictable behavior.
The Problem: Quality assurance teams need automated regression testing for Modbus communication systems with repeatable test scenarios and comprehensive coverage.
How Modbus Digital Twin Helps: Enables automated test suites with programmable device behavior, test data generation, and result validation. Supports continuous integration pipelines for industrial software.
Comprehensive Modbus implementation details
Quick start with Modbus Digital Twin
Create a simple Modbus TCP device for Ethernet network testing
using ULTRAMEGA.Modbus.DTS;
// Create TCP device
var tcpDevice = ModbusDeviceFactory.CreateTcpDevice(deviceId: 1, port: 502);
// Set up event handlers
tcpDevice.OnLogMessage += (sender, message) =>
{
Console.WriteLine($"[TCP] {message}");
};
// Start the device
await tcpDevice.StartAsync();
// Set some initial values
tcpDevice.SetCoil(0, true);
tcpDevice.SetHoldingRegister(0, 1234);
// Keep running
Console.ReadKey();
await tcpDevice.StopAsync();Configure a Modbus RTU device for serial communication testing
// Create RTU device with custom settings
var rtuDevice = new ModbusRtuDevice(
deviceId: 2,
portName: "COM3",
baudRate: 9600,
parity: Parity.None,
dataBits: 8,
stopBits: StopBits.One
);
// Configure timeouts
rtuDevice.ResponseTimeout = TimeSpan.FromMilliseconds(500);
rtuDevice.RetryCount = 3;
// Set up logging
rtuDevice.OnLogMessage += (sender, message) =>
{
Console.WriteLine($"[RTU] {message}");
};
await rtuDevice.StartAsync();Implement custom device behavior with realistic data simulation
public class CustomDevice : ModbusTcpDevice
{
private Random random = new Random();
public CustomDevice(byte deviceId, int port) : base(deviceId, port) { }
public override void SimulateData()
{
// Simulate temperature sensors
for (int i = 0; i < 10; i++)
{
float temp = 20 + (float)(random.NextDouble() * 15);
SetHoldingRegister(i, (ushort)(temp * 10));
// Simulate alarm states
bool alarm = temp > 30;
SetCoil(i + 100, alarm);
}
base.SimulateData();
}
}Everything you need to evaluate and implement Modbus Digital Twin
Complete API reference for TCP and RTU device simulation with code examples and best practices.
Get started in minutes with step-by-step tutorials for creating your first virtual Modbus devices.
Detailed Modbus TCP and RTU protocol implementation guide with advanced configuration options.