Setup a Modbus server


I have a problem setting up a modbus server, hope someone can help me.
I want to use the Raspberry as a Modbus Server.
I want to connect vacuum pumps to the raspberry so that I have a monitor system
Each pump has its own IP address.
Pump 1: IP port 502
Pump 2: IP port 502
up to 6 pumps

The problem now is that the connection is constantly broken between the pumps. is due to the different IP addresses, i Think??
Therefore I think a MODBUS server is the solution for me ?? I hope??
I have already tried something but then the system crashes completely

My question.
How should I configure the modbus server?
which ip address should the raspberry have and which ip the modbus server etc

thank you in advance

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