TTL to RS485 Converter Module with MAX485CSA
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Prices updated: 13 Oct 2026
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About this product
A breakout module built around the MAX485CSA transceiver that converts TTL-level serial signals from a microcontroller to RS-485 differential signals, and back. It connects Arduino, ESP32 or similar boards to RS-485 industrial devices such as sensors and meters over a half-duplex bus.
Specifications
- IC
- MAX485CSA
- Interface
- TTL serial to RS-485
- Duplex mode
- Half-duplex
- Supply voltage (IC)
- 4.75 V to 5.25 V
- Control pins
- RO, DI, DE, RE, A, B
Frequently asked questions
How do I wire it to an Arduino?
Connect RO to the Arduino RX pin and DI to TX. Connect DE and RE together to a digital control pin, or leave them tied together if the module does this internally. Drive DE high to transmit and low to receive. Connect A and B to the RS-485 bus, plus VCC and GND.
Do I need termination for long cable runs?
For long runs, use twisted-pair cable and add a 120 Ω termination resistor at each end of the A–B bus. This reduces reflections and improves signal integrity at higher baud rates.
