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Part Number: SN888C
I would like to know those two things. Can you answer to the questions?
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.
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