2. ADM1485ARZ‑REEL7 Substitution Conclusion Electrically and functionally, this device offers high substitution feasibility; however, system compatibility with high‑speed signals should be evaluated. This model aligns closely with the original part in critical aspects: both are half‑duplex, pin‑compatible, support the same protocol, and share an identical supply voltage range. Two differences exist: first, the data rate is significantly higher (30 Mbps vs. 250 kbps). While this provides ample margin in the original low‑speed system, the faster edge rates impose stricter requirements on PCB layout integrity and termination matching. If the existing design is rudimentary, signal ringing or reflections may become a risk. Second, the receiver hysteresis is slightly lower (70 mV vs. 75 mV), resulting in a minor theoretical reduction in noise immunity, though this is negligible in most standard industrial environments. Overall, it is a functionally compatible upgrade, but attention must be paid to board design and cable connection quality under high‑speed signaling conditions.