MODBUS RTU communication time out faillure

Good morning,

We are trying to build a data acquisition app with ignition before to bye a license, we get a problem of communication with MODBUS RTU module,
we have 3 Modbus address of flow meters when I communicate with only one I don’t found any problem , when I enter the second and the third flow meters I got a problem of time out
could anyone help me to resolve this issue?

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You might get some ideas here: