Arduino as Modbus Slave

Hello,

I want to make my Arduino as Modbus Slave to send data to my computer. Does anyone know a good SLAVE library for my?

for example I want to do this: Adding a led to the Arduino, and read the state of the led via a Python programm on my PC. I use a USB A - USB B cable for the Modbus communication

With kind regards,

Does anyone know a good SLAVE library for my?

I'm using a modified version of [this library](http://Does anyone know a good SLAVE library for my?) for my own project and it works great.