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What is ModbusPal?
ModbusPal is a MODBUS slave simulator. Its purpose is to offer an easy to use interface with the capabilities to reproduce complex and realistic MODBUS environments.
The core of ModbusPal is written in Java. TCP/IP is supported natively, and the serial communication is supported if RxTx library is installed on the computer.
Other simulation tools offer built-in functions to 'animate' the data of the virtual MODBUS slaves. But there are always situations where predefined functions cannot reproduce the reality. The approach of ModbusPal is to let the user write external scripts: what predefined functions can't do, scripts will.
Hyperterminal private edition serial number. The second key feature of ModbusPal is the 'Learn' mode. As ModbusPal receives MODBUS requests from the master, it will dynamically create the missing resources: slaves, registers and coils are generated on-the-fly.
ModbusPal is free and open source, released under the GPL license.
What does ModbusPal do?
In its latest version, ModbusPal simulates only MODBUS slaves. The MODBUS protocol is not fully implemented (RTU, Serial, TCP/IP, registers, coils), but its getting better and better.
ModbusPal can simulate up to 247 MODBUS slaves. Each slave can has holding registers and coils. Each register or coil can be animated by being associated to a dynamic value generator, called 'automation'.
Free Modbus Software
There are so many different devices in the field using MODBUs in so many different ways that it is impossible to create a universal similator. Unless, like ModbusPal, the user is encouraged to create scripts that implement the specifities of the simulated devices. ModbusPal lets the user create Python scripts of many different kinds:
- customized value generators
- customized bindings to associate an automation to a register or coil
- customized MODBUS function code, in the 'user-defined' range (65-75 and 100-110)
- generating a project-specific user-interface (using Swing, for example)
- creating a time-based script: activate this, disable that, add a new element in the project, ..
Modbus Slave Simulator Software
ModbusPal can be embedded in another Java application as a third-party library. Most of the source code is commented, and the Javadoc is also available for download.
Also introduced in v1.6, each MODBUS slave has behavioral settings such as:>/p>
- response time (random value within a configurable range)
- simulated random errors (currently, only the 'no reply' error type exists)
What's new in v1.6?
- Add support for 1, 1.5 or 2 stop bits (serial link)
- Add automation chart (requires jfreechart)
- Fix tcp/ip link when reply is length=0
- Disambiguation of the various 'saveSettings' and 'loadSettings' methods
- Introduce the 'Tuning' tab in slave dialog.
- New embedded help browser
- Fix bug with list of existing instances in AddFunctionDialog
- Add SINT16 binding
- Simplification of script support. Only one 'kind' of script is offered
- The user can define scripted PDU processors for the 'user-defined' MODBUS functions
- Add 'stay on top' checkbox in some dialogs
- ModbusPal can be executed without a GUI.
- ModbusPal can be embedded into another java application
- Add a sine generator
- Change name of slave address selection dialog when duplicating