Does the Mac support Uart baudrate change to 3M?

[yxq-Jason]

Hi
I am trying to run a DOE with select baudrate change from 230400 to 3M in Mac.
it works well except for 3M baudrate.(coolTerm not work as well)

Something weird is it works in Win10 with coolTerm.

My question is does the Mac support 3M baudrate change? I don't know the difference between Mac and Windows.
Is there something missing?

[yxq-Jason]

Add more info. Here I use FT4232H to test high speed with 3M baudrate. I use ORSSerial library or coolTerm to switch 3M baudrate but all not work in Mac(got nil response), only works in Windows. Has anyone tried?

[armadsen]

This is a function of the driver and specific USB to serial hardware you're using. You can try setting serialPort.allowsNonStandardBaudRates = true and then setting your high baud rate using the baudRate property, but that may or may not work, and the underlying system API that ORSSerialPort uses doesn't really provide any direct feedback on whether it did or not.