'Query Related Modbus RS485 Communication

I am currently working on a project that uses Modbus communication protocol.I used TTL to RS485 converter module. I have one master and six slaves. The communication between the master and individual slaves works fine. But when I connect all six slaves there seems to be some random behavior observed( Getting slave response but it's not fixed) How should I proceed?

embeddedstm32modbusrs485


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