I have a question about a combination of pull-up and pull-down resistors as attachment.
According to the AN-960 explanation, it is required to be placed at one position on the bus.
Is it better to place it at not one position but all 32 nodes to ensure the solution, or placing it at all 32 nodes could cause any problem?
Fail safe biasing is only required at one location on the RS-485 bus.
Many ADI RS-485 transceivers include an integrated RS-485 failsafe circuit, eliminating the need for external fail safe biasing resistors.
For example, the ADM3065E includes open, short circuit, and idle fail safe: