AT20Q-SM is set to the USB-COM interface by default. Therefore, when AT20Q-SM is connected to a PC on which no driver has been installed, the device will not be powered on.

To set AT20Q-SM by reading the QR-Coded Parameter Menu, turn it on using either of the following methods.

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  • Connect AT20Q-SM to the USB port of a PC on which Active USB-COM Port Driver is not installed, and press the Trigger Switch for two seconds or longer. The interface of AT20Q-SM will be switched to the USB keyboard, and the AT20Q-SM will be powered on. ^{(Note 1)}
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    • Install the Active USB-COM Port Driver to the PC and connect AT20Q-SM to the PC.
      Downloading the Active USB-COM Port Driver
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    (Note 1) This function is effective on the following models.

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    Model	Firmware Version
    AT20Q-SM/AT21Q-SM	Version 1.10 or later
    AT25Q-SM/AT26Q-SM	Version 1.10 or later