Hi Team,
My customer is using SN65HVD1780 star topology (8 slaves, 15 meters) but has some communication issues. I saw the E2E post and App note below and found repeater solution.
Is Star Topology of MODBUS-RS485 Possible? : https://e2e.ti.com/support/interface/f/138/t/402084
AN-979 The Practical Limits of RS-485: https://www.ti.com/lit/an/snla042a/snla042a.pdf