1. Click the "View", and then check the "IO state".
Here comes IO interface, including "input IO" and "output IO". (Some other numbers as you detected before with pressing green button.)
2. Hold the marking head, and press the green button for 5-10 seconds, and check the input IO.
You will see some IO lights are red. For example, if you press the green button on the marking head, the port 2 of the input turns red, remember it.
3. Go back. Check the technical parameters (F3), check "port", and change the start marking IO as "2".
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