Applescript Read Serial Port

Do you know the printer is working properly?You are trying to fix more than one thing at once and that's never a good idea. What I suggest you do is get a breadboard and make your own printer simulator. You need to connect and LED up to every output pin and a button to every input pin.Then you can simulate data from the printer, i.e. Just pressing the button for pin 3 and you should see 1 coming out on the serial monitor. OK I agree this 'simulator' is rubbish, but you probably have the bits to knock it up now.If you are still seeing 'junk' values then have a look and see if there is a pattern to the data. This would be helped by printing the values in hex.Of course if the Arduino side works then the issue is that the printer is sending data that you are not expecting.

If you prefer to use Minicom, you could still use the AppleScript to wrap it into a nice launchable app - use this older hint to find the right command line commands. Many USB-Serial adapters use the chip from FTDI. Install the 'Virtual COM Port' driver and look for the proper TTY name in /dev.

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It might help stick LEDs on every pin, both directions, it will help you see what is being sent.Its possible that you are expecting 1 to indicate the bit is set and the printer is using 0.