TTL To RS485

TTL‑to‑RS485 Dual‑Mode UART Bridge – Seamless Serial Migration

The TTL to RS485 module bridges the gap between standard microcontroller UART logic levels (0–3.3 V or 0–5 V) and industrial‑grade RS485 differential networks. Its compact design includes an integrated line driver and receiver (MAX485/Max3021 family), optional 5 V/3.3 V level shifting, and a built‑in multi‑point termination structure. This enables high‑reliability communication over long distances (up to 120 m at 115 kbps) while protecting the MCU from voltage spikes and ground loops.

• Serial Interface: 8‑bit UART, 9‑bit support, configurable baud rates up to 1 Mbps
• RS485 Driver: ±400 mV drive voltage, 1.5 A max, includes auto‑direction control and bus termination resistor
• Power Supply: 3.3 V or 5 V regulator, 50 mA consumption, supports PoE‑ish 12 V/2.5 W operation with level shifting
• Common Use Case: Ideal for industrial automation, building automation, SCADA, and multi‑node sensor networks where robust, long‑haul serial links are required

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