Answer:
In a full duplex setting, the RS485 has a pair for receiving (A, B) and a separate pair for transmitting (Y, Z). Since the main bus, in this case, uses two wires of transmission/receiving only, ADM2482E should be wired in a half-duplex configuration, i.e. By connecting A to Y and B to Z as shown in Figure 30 of ADM2484E's datasheet. Also shown below:
The users should also note that for half-duplex operation, both ends of the line must be terminated, because either end can be the receiving end. Hence, a termination resistor needs to place on both ends. Also, half-duplex communication allows only transmitting or receiving at a given time. Therefore, the users need to enable either the receivers or drivers at a one time by via the enable pins (RE_N and DE). For ease of control and to save space, users may tie them together and control them via one GPIO on a micro-controller.
If the user application requires a space saving solution, they could also consider using ADM2895E, a 5.7kV RMS Signal and Power Isolated Half-Duplex RS-485 Transceiver with Fault Protection Transceiver. This is strictly half-duplex and also provides isolated power, eliminating the need of using a secondary power source.
https://www.analog.com/media/en/technical-documentation/data-sheets/adm2895e_adm2895e-1.pdf
If an even more space-saving solution is sought, users may consider using MAX22025 series that have an auto-direction feature. Auto-direction helps determine the direction of data flow (transmission or receiving) without needing enable pins to control the transmitter/receiver. This saves further space on the board.
https://www.analog.com/media/en/technical-documentation/data-sheets/MAX22025-MAX22028F.pdf