cocoa - accessing low level attributes of a NSStream

Question

I have a Keyspan PCI to RS-422 adapter that I'm using to connect old serial devices to a Macintosh. I would like to use NSInputStream and NSOutputStream to read and write so that I can take advantage of asynchronous nonblocking I/O since there will be several devices attached to this system that each have their own idiosyncrasies.

My question is how can I access some low level parameters for the devices using a NSStream (baud rate, count of stop bits, parity, etc)?

Answer 1

我以为我在问问题之前研究了所有内容，但答案在另一个类（NSFilehandle）中。