Here comes the DFPlayer Pro-a mini simple but powerful MP3 Player! This MP3 player module supports four controlling modes: Arduino, AT command, on-board buttons, and ADKEY. You can directly press the on-board button to play or switch music without using a controller. By using a USB cable, you can easily copy your favorite songs into this module to play them any where you want, or use it as a sound card for your PC or Raspberry Pi after connecting them together.
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What is "Slave Mode" and module doesn't show in COM port #12
I've try to connect the module to my PC. When connected I can see the USB disk, but I cannot see it in COM port. So it's impossible to use the tool to configure the module with AT commands.
When I plug it, I can hear "Slave Mode", led is OFF.
If I push the button, I hear "Music" and blue led ON.
I've buy 3 modules, hope to find a way to configure them !
usb can only store audio files, and AT commands need to be connected to uart.
If you want to connect to a pc, you should find a uart to USB auxiliary module.
More usage information can be found in this wiki: https://wiki.dfrobot.com/DFPlayer_PRO_SKU_DFR0768
qsjhyy
commented
3 months ago 
sbarabe
Hi,
I've try to connect the module to my PC. When connected I can see the USB disk, but I cannot see it in COM port. So it's impossible to use the tool to configure the module with AT commands.
When I plug it, I can hear "Slave Mode", led is OFF. If I push the button, I hear "Music" and blue led ON.
I've buy 3 modules, hope to find a way to configure them !
Thanks !