ModbusPal is a project to develop a PC-based Modbus simulator. Its goal is to reproduce a realistic environment, with many slaves and animated register values. Almost everything in ModbusPal can be customized and controlled by scripts.
The MODBUS slave configuration dialog in ModbusPal v1.6
The automation editor of ModbusPal v1.6
The main frame of ModbusPal v1.6
v1.4 running a Jython script that displays a jFreeChart