Ebyte EBT3002 T6 User Manual page 12

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Serial port 8 network link status indicator pin, output
low level when no network cable is detected after power
L-LED8
on, output high level when network cable is detected,
and output low level when there is a network connection
USB2DM Factory burning for use, suspended if not in use
USB2DP Factory burning for use, suspended if not in use
Upgrade and use, pull down the power to enter BOOT mode,
BOOT0
otherwise hang in the air
VSS_ three Grounding
VIO_ three External 3.3V
EBT3002 User Manual