RS485 to TTL UART Converter Module with Protection, 3.3V/5V
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Prices updated: 13 Oct 2026
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About this product
An RS485 to TTL UART converter module that links a microcontroller serial port to an RS485 bus for long-distance industrial communication. It is compatible with 3.3 V and 5 V logic and power, and has RXD and TXD indicator LEDs. Listed for transmission up to 1 km, with 800 m recommended.
Specifications
- Logic level compatibility
- 3.3V and 5.0V
- Power supply
- 3.3V and 5.0V
- Operating temperature
- -40 ℃ to +85 ℃
- Transmission distance
- Up to 1 km (800 m recommended)
- Indicators
- RXD and TXD LEDs
- PCB thickness
- 0.8 mm
- Pads
- Semi-hole pads
Frequently asked questions
How do I connect it to an Arduino?
Connect VCC and GND to a matching 3.3 V or 5 V supply and ground. Cross the UART lines as is typical for these modules: module RXD to the controller's TX pin and module TXD to its RX pin. Connect A and B to the RS485 bus, A to A and B to B.
How far can it communicate?
The listing states transmission up to 1 km, but recommends 800 m with the test cable used. Beyond 800 m, add repeaters, and use twisted-pair cable for better noise immunity.
