#2 return charactors for button

[endo]

The "D" command was send bettween "N*" and "F*".
(The button keep pressing).
That make freeze gainer.

[Shigeru Kobayashi]

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user_id=1339606

The easiest way to reproduce is as follows:
1. press the button on a 'gainer' board
2. send H1*

After sending the command, the gainer board will stop
responding.