Usually on a Linux host, the Key Croc will register as either /dev/ttyUSB0 or /dev/ttyACM0. On an OSX/macOS host, the Key Croc may register as /dev/tty.usbmodemch000001.
Next, connect to the serial device using screen, minicom or your terminal emulator of choice.
If the screen application is not installed it can usually be found from your distribution package manager.
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sudo apt install screen
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Connecting with screen
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sudo screen /dev/ttyACM0 115200
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Disconnect with keyboard combo: CTRL+a followed by CTRL+\
CONNECTING TO THE SERIAL CONSOLE FROM MAC
MacOS users may follow the same recommendations for connecting to the Key Croc serial console as Linux users.
Many MacOS specific applications exist for connecting to and managing serial connections however, with Serial 2 by Decisive Tactics being a favorite. See https://www.decisivetactics.com/products/serial/