How to connect a 3-wire modbus device to Arduino Portenta UART?

controls_guy2008 October 16, 2025, 4:27pm 1

Hello,
I am looking to connect a sensor that uses a tricky 3-wire modbus protocol to a serial UART on the arduino portenta. Any ideas? I am lost.

Topic		Replies	Views
ArduinoModbus (RS485) with Portenta Machine Control - Basic guide [UPDATED for the new Arduino_PortentaMachineControl library] Portenta Machine Control	25	5483	December 19, 2025
Portenta C33 and Arduino fieldbus libraries? Portenta C33	0	32	October 27, 2025
Paid expertise required to interface a sent interface with a portenta over modbus Jobs and Paid Consultancy	2	67	July 29, 2025
How to declare and use the different UART serial ports on the portenta c33 Portenta C33	14	981	June 8, 2024
Using Arduino Modbus RTU libraries for ESP32 3rd Party Boards	47	837	August 28, 2025