Your proofing plate, single chip microcomputer data sent via di, sp3485 ro side has no data is returned, ab side also no data is returned, I do not know why to, bitter

CodePudding user response:

Circuit to check if you have any questions, and then use the logic analyzer to test have MCU sends out signals, and then have AB end, step by step test

CodePudding user response:

Half duplex will generally control RE (receiving enabled) and DE (sending enabled)