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A modbus RTU/TCP slave application

Project description


pyModSlave is a free python-based implementation of a ModBus slave application for simulation purposes and is based on [modbus-tk] (, [pySerial] ( and [pyQt4] (

It starts a TCP/RTU ModBus Slave.Builds 4 data blocks (coils,discrete inputs,input registers,holding registers) and sets random values. You can also set values for individual registers.

To configure the logging level set the 'LoggingLevel' in 'pyModSlave.ini' file

  • CRITICAL : 50
  • ERROR : 40
  • WARNING : 30 [default]
  • INFO : 20
  • DEBUG : 10
  • NOTSET : 0

You can easily build a windows standalone 'exe' version using the command : 'python build' from the installation folder (you will need to install 'cx_freeze' package).

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Files for pyModSlave, version 0.4.3
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