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3 Size and pin definition
No.
Name
1
GND
2
GND
3
GND
4
GND
5
M0
6
M1
7
RXD
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Direction
Ground
-
Ground
-
Ground
-
Ground
-
Input
Work with M1 to decide 4 working modes of module (not suspended, if not
（weak pull-up）
used, could be grounded).
Input
Work with M0 to decide 4 working modes of module (not suspended, if not
（weak pull-up）
used, could be grounded).
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be
Input
configured as open-drain or pull-up input. Ground
E220-400T30S User manual
Function
6
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