Hey I am very new to Arduinos, and electronics in general. I would like to use a Arduino UNO to make a serial communication with RS485 protocol with a 925k baud rate. I am looking for references to best go about this.
Thank you very much

I don't think you can achieve 925Kbaud on a 16MHz AVR. A quick look at an online baud rate calculator suggests that for a 16MHz AVR, the baud rates closest are 500Kbaud and 1Mbaud.