In a previous post Serial Console on OS X I wrote about how to connect a USB-Serial converter to console into Cisco router and use the ‘screen’ command.
To perform a password recovery on a Cisco router you need to issue a “terminal break” character to interrupt the boot process. The Cisco page on terminal break shows a lot of break sequences.
Receiving Serial Port Input Data. As per Stack Exchange: Is there an OS X terminal program that can access serial ports? “You can use the terminal command screen to do this!!!” Next, you can read that serial port using the screen command like this —. Determine your current serial ports on your Mac. Type the following command in Terminal. Note: Your serial connection will only appear if your USB to serial adapter is plugged into your USB port. Ls /dev/tty. Next, type the following command and replace with your serial connection you identified in the previous step.
The break sequence for “screen” is to use Ctrl-A and then Ctrl-B. The Ctrl-A shifts the focus back to the screen process (away from the serial console) and the Ctrl-B issues the break sequence.
Radford university website. Visit the Software Center (PC) or Self Service (Mac) for a complete listing of software available for download on university owned machines. If the software needed isn't listed or if you have a Mac please enter a request at ITOneStop.
Mac Os X Usb Serial Port Terminal
Serial Port Terminal Os X
You may need to break more than once. This is done by Ctrl-A, Ctrl-B, Ctrl-B, Ctrl-B.