I'm trying to ID diodes on a board - the markings on the diodes are "BK 9EJ3D". I understand this is a TVS diode and it's being used to clamp RS485 differential pair to ground with a termination circuit into a MAX 485 driver (485 to ttl). They measure around 730 ohm in both directions when I use a multimeter. Signal is something similar to DMX.
Any help appreciated.