Post both codes and a drawing or description of how the circuits are connected and powered.
If the code is clean, possible causes are missing termination or biasing, timing issues with DE/RE control, or signal integrity problems on the RS485 bus.
Post both codes and a drawing or description of how the circuits are connected and powered.
If the code is clean, possible causes are missing termination or biasing, timing issues with DE/RE control, or signal integrity problems on the RS485 bus.