Document use of screen for info dump

[Xylopyrographer]

macOS, through its Terminal app supports the "screen" serial monitor app.

For those not having the Arduino IDE installed, users could use screen to see the STAC startup info dump.

It's pretty techie, but easier than installing an IDE.

Though also need to install the USB driver to talk to the STAC...

Terminal commands to connect to a STAC

After the CP driver is installed, connect the STAC to a USB port on the computer.

1. Open Terminal on the Mac.
2. In terminal, find the STAC serial address by typing: ls /dev/cu.usbserial*
3. Look for a line like: /dev/cu.usbserial-3552F606F3
4. Select and copy the above.
5. In Terminal, type "screen" and then paste in the line from above and then type "115200". The complete line should look like this: screen /dev/cu.usbserial-3552F606F3 115200
6. Hit the return key.
7. Restart the STAC.

In the Terminal window, you should see the STAC startup information.
Something like:

======================================
               STAC
   A Smart Tally ATOM Matrix Client
         by: Xylopyrographer
https://github.com/Xylopyrographer/STAC

    Software Version: 1.7.1
    WiFi Network SSID: TheSmartTallyNet
    Smart Tally IP: 192.168.2.41
    Port #: 80
    Operating Mode: Camera Operator
    Active Tally Channel: 3
    Max Tally Channel: 6
======================================

To quit:

1. In the terminal window, type "ctrl-a" then "k"
2. Confirm that you want to close the screen window by typing "y".
3. Quit the Terminal app.

If you see a bunch of garbage on the screen after typing the screen /dev/cu.usbserial-3552F606F3 115200 command, ensure the last thing on the line is exactly 115200. Computers are fussy that way.

[Xylopyrographer]

Document created. Saved in the STAC folder.