Revert "rs485 example"

This reverts commit ed98566689f5314aa254590f15585524099bfb4e.
Revert "Revert "rs485 example""

This reverts commit d15501dc7839afbd8ef8efc180be8cff78fa27de.
Revert "Revert "Revert "rs485 example"""

This reverts commit 3658fcab535e506233bff2053fed3e5ea07bea08.