Modbus Slave Simulator
UnSlave is a programmable, developer-friendly Modbus slave simulator.
Unslave makes it possible to simulate any number of Modbus slaves without dealing with manual GUI setup.
If you need automate Modbus testing, this tool is for you.
The Easiest Way to Communicate With Devices
Getting started with Unslave is quicker than with any other simulator, thanks to it's simple configuration API.
Using JSON files for configuration makes it possible to automate testing and track configuration changes.
Alter configuration at runtime programatically by using an HTTP API.
UnSlave can display and store everything that happens on the Modbus netowork, making diagnostics easier.
Use UnSlave to simulate any number of slaves on the same network.
You can configure any slave to return a Modbus exception code instead of a register value.
No installation needed. You can run UnSlave on any Windows PC from a USB drive.
Serial/RTU + TCP
Simulate either RTU or TCP slaves. Or run two UnSlave instances to support both.
Value for Free
It doesn't cost you anything to get and use Unslave.
Powerful Configuration and API
Add any number virtual Modbus slaves, registers and even simulate Modbus exceptions by editing a simple JSON file.
Alternatively, you can use the HTTP API provided by Unslave to update configuration at runtimeDownload Now