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SN888C: Master and Slave

Intellectual 1790 points
RYO

Replies: 1

Views: 40

Part Number: SN888C

Hi all,

I would like to know those two things. Can you answer to the questions?

  1. I would like to know if SN888C can be used at master. Is this feasible? In the datasheet Figure 1, the device is only at slave. Also, what is the difference between SN888C and SN65HVD82, which are the slaves and the master, respectively in the datasheet?
  2. Also, is it possible to put SN888C with different supply voltage at the same RS-485 bus? In this case, are there any concerns?

Regards,
RYO

Intellectual 1790 points
RYO
  • Mastermind 20635 points
    Hao L

    RYO,

    SN888C needs to work with an 'established' bus, meaning the bus voltage is determined. The bus voltage could be generated by a regular RS-485 like SN65HVD82 or by the pull up/down resistors (as Figure 11 on the datasheet). Back to your question, SN65HVD82 would be the master and SN888C the slave if they share the same bus. SN888C can work as the master with the pull up/down resistors.

    SN888C only works with 5V supply. However a 3.3V RS-485 and a 5V one can work together since both handle RS-485 signaling.

    Regards,

    Hao

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