I have a problem with SN65HVD72 at the first power up.
The B line is flat (between 0.3 to 0.8V). When I reset the card, it's work fine and the B line is normal (0.3 to 2.6 V).
I only have 2 SN65HVD in the line, with small distance (40 cm), 120 Ohm between A and B on each side.
I don't understand ! It's not the first time I use RS485, but I never see this problem.
Before I don't use this drivers but MAX485 or MAX3034.
Have you an idea ?
Best regards.
