There have been a couple of questions lately about RS-232 options for
OS X. My favorite is Keyspan's family of USB-serial adapters. There is
also sample code available on Apple's developer site that shows the
basics in how to program for serial communications using IOKit. When I
first came across this sample code, it struck me as a bit confusing and
a lot of work just to set the table for using a serial port. I have
since gotten the hang of things and have written serial drivers for
many widgets using this sample code with my own tweaks.
One of these days I should get around to making a full-blown Cocoa
class for RS232 ports, but in the meantime I have run across a couple
other ones, and if anyone is interested I would be happy to share my
code and/or guide you through the process of setting up a serial port
for an application written in C (can also be used for Obj-C and C++ as
well). I have written code for popup menus that display the list of
available ports, allowing the user to select which one to use, reading
and writing to a port with simple functions and so on.
Bottom line: if you need to communicate with something over RS232 with
OS X, it's really very easy using the sample code given by Apple,
provided you know what little bits you need to tweak!
"One word is worth 10^-3 pictures"
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