KEPServerEx keeps disconnecting from Raspberry pymodbus

[mtrubia]

Hello,

I'm building the Sigma Tile solution. My KEPServerEx 6.4  keeps disconnecting from the Python Modbus server running on the Raspberry Pi. I figured out that the disconnection occurs exactly when the sequence number of the Modbus packets sent by the Kepserver to Pi reaches 256, hence likely the python server experiences kind of a 8bit data overflow.

Do you know how can I prevent the KEPServerEx from generating numbers greater than 255 to avoid this problem?

Much appreciated your effort.

Massimo

  

[mtrubia · Accepted solution]

I just fixed this problem by installing the pymodbus 1.5.0.

It was reported as a bug few time ago upon 1.4 (link) and it was just fixed (link)

If the below command  gives you the 1.4.0 version of pymodbus

pip show pymodbus 

You have to install the 1.5

sudo pip install pymodbus==1.5.0

BR