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THVD1520: Data Lost issue

Ning Li
Intellectual 770 points

Part Number: THVD1520

Dears, We promote THVD1520DR to replace the ST485ABDR,When they test the fuction find data lost issue. The Master is 1PCS,the Slave is 16 PCS and the Peripheral circuit is the same as ST485ABDR.

Pls kindly help to check the schematic.

Thanks

  • 0
    Guru 320330 points

    A RS-485 bus must have exactly two termination resistors, at the two ends of the cable. If you put 120 Ω at every device, then the load will be much too high.

  • 0
    TI__Guru 53772 points

    Hi Ning,

    1. How long is the bus - and what network topology are you using? 

    2. It looks like terminations are not connected - is this true? Regardless - only first and last node should be terminated in most cases. 

    3. What data rate are you using? 

    4. Are the 10K biasing resistors only connected on one node? 

    Please let me know!

    Best,

    Parker Dodson