Standalone Windows app supporting Modbus RTU, TCP, UDP and ASCIIoverRTU protocols for simulation. Also included are its Mono versions for Linux and Mac OS X (these are VB Net versions so for Linux you will have to install mono-complete and mono-vbnc packages while Mac might be different depending on the OS X version).
It is designed to allow running multiple instances of the app at the same time, for example:
- use the same protocol for each instance but with different port numbers -> IP 127.0.0.1 TCP Port 501 and IP 127.0.0.1 TCP Port 502
- or use a mix of different protocols with help of other tools (like com0com for RTU protocol)
- the app should service requests for any valid Modbus slave ID
Based on modified nModbus .NET 3.5 libraries, Copyright (c) 2006 Scott Alexander. These are included as a resource for Windows version but are separate for Mono version.
Intended to be used as a quick testing tool. Can be tested with its counterpart ModbusMaster or maybe use the AdvancedHMI software instead since it is highly functional and free.
- All values can be set before the connection is established - Coils, Discrete Inputs, Input Registers, Holding Registers.
- The Data Grid View is set to initially show 20 rows but can be changed within the
Row Countto show more or all rows if necessary. - In the Data Grid View,
I/O Address Range, double-click the value to change it:- Boolean values will flip between 0 and 1
- Uint16 values require unsigned integer value between 0 and 65535
- Discrete Inputs and Input Registers provide
read-onlyaccess to the Master application and should be manipulated by the user directly in the simulator. - Coils and Holding Registers provide
read/writeaccess to the Master application and can also be manipulated by the user directly in the simulator. - For
RTUASCIIoverRTUprotocols, on a single PC, this simulator can use the help of the com0com Windows program to provide virtual serial port pairs. - Additional TextBox allows manual input of the serial port:
- Mainly intended for Linux so tty0tty virtual port pairs, like
/dev/tnt0<=>/dev/tnt1, could be accessed - This box was removed in Mac Mono version
- Mainly intended for Linux so tty0tty virtual port pairs, like
- The library also supports Masked Bit Write, function code 22 (0x16H).
- Either use Windows executable files from the
exefolder or follow the instructions below to build it yourself. - Download and install Visual Studio community edition (ideally 2019).
- Download and extract the zip file of this project.
- Open this as an existing project in Visual Studio and, on the menu, do:
- Build/Build Solution (or press Ctrl-Shift-B).
- Debug/Start Debugging (or press F5) to run the app.
- Locate created EXE file in the
/bin/Debugfolder and copy it over to your preferred folder or Desktop - For testing RTU protocols use com0com to create virtual serial ports
- Make sure that Mono is installed on your computer, both
mono-completeandmono-vbncfor Linux while for Mac you might need to experiment (maybemonoandmono-basic). - Download and extract the zip file of this project and locate Mono archive in the
Monofolder. - Extract 4 files and potentially rename the newly created folder and/or exe file to something shorter if you wish (just to make terminal navigation quicker).
- Open the terminal, navigate to the folder and type:
sudo mono ModbusSlaveSimulation.exe(on Mac you might need to switch to superusersuaccount) - For testing RTU protocols, on Linux you can possibly install and use tty0tty virtual ports while on Mac the later OS X versions seem to have pseudo terminals - pairs of devices such as
/dev/ptyp3and/dev/ttyp3.
Note for Mac users: this was tested on an old iMac G5 PowerPC computer with Mono v2.10.2. Some odd behaviour was present in a sense that the app was loosing focus thus disrupting continuous TCP communication. There is a text box with red X that you can click to try to maintain focus (if you do something else afterwards then click it again). Since I cannot test it in any other way then it is left for you to experiment.
Licensed under MIT license - see also the README.txt file inside the Resources folder.
Any and all trademarks, either directly or indirectly mentioned in this project, belong to their respective owners.
The AdvancedHMI website forum, which is another open source project that has this app, its Mono version as well as its VB version.