When you plug your board in to USB on your computer, it connects to a serial port. I am very pleased with this products and after a day of extensive Connect, Disconnect, Exit, Launch, Connect, Disconnect rince and repeat I had no issues with this software at all. I had a new Router that needed to have new Firmware flashed before the web interface would be effective and I was able to connect to the Serial Console immediately after setting the proper speed setting in the software. Could you contact me when my minor issue is fixed so I may boost the rating back to 5 stars? There are some over-priced software products out there for using your USB port to access the serial console on a Router, but this one was Free and does a very nice job.
I love the App Store products because you can use purchases on all your devices if there is a limit, I have not reached it. I have other expensive products, but they are licensed for other devices. I know the serial dongles still work with other older! Updated: Finally, a good app at a good price to control serial device connections with my MAC. It includes a Terminal Emulator, a Protocol Analyzer and a serial port monitor to watch for connections and removals of serial ports.
Serial Tools is a set of serial port tools for OS X.