SN65HVD1780: SN65HVD1780 star topology

Yang Wu

Part Number: SN65HVD1780

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

over 4 years ago

0 Hao L over 4 years ago

TI__Mastermind 25705 points

Yang,

If the data rate is really slow and distance is short, the signal have enough time to settle. Otherwise applying repeater is a good way to get around the reflection issue. BTW, the link was broken in the e2e post. I re-post the repeater app note here.

www.ti.com/.../slyt480a.pdf

Regards,

Hao

0 Yang Wu over 4 years ago in reply to Hao L

TI__Expert 3160 points

Hi Hao,

Got it. thanks a lot.

Yang

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SN65HVD1780: SN65HVD1780 star topology