The Rs485 chips with 5V and 3.3v power supply both meet the EIA-485 standard according to the datasheet. If the two chips are mixed in one system, is there any compatibility problem?
The following figure, found 22 Ω / 0603 resistance phenomenon often burned, for unknown reasons.The circuit is as follows. There are two modules in A system, module A and module B respectively, which often burn the resistors R3 and R7 in the red circle.
