I'm trying a design with the RS485 transceiver mentioned in the title on 2 different cards but using the exact same transceiver design. The schematic design is almost identical to the reference design in the datasheet but with a termination resistor (120 ohm) and a pull-up/pull-down fail safe resistor (10k) on A and B respectively. One card works perfectly and on the other card the A & B lines are outputting at the same polarity and not in differential mode. Both circuits were tested using a USB to 485 converter to the SN65HVD1781-Q1 circuit.