Chengdu Ebyte Electronic Technology Co.,Ltd.
E280-2G4T12S User Manual
Copyright ©2012–2021
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Chengdu Ebyte Electronic Technology Co.,Ltd.
7
3 Hardware description
3.1 Mechanical size and pin definition
Pin
number
Pin
name
Pin
direction
Pin usage
1
GND
Reference
place
Module ground
2
NC
Empty feet not connected
3
M0
enter
The combination of M2, M1, and M0 determines the 8 working modes of the module (cannot be
suspended, if not used, it can be grounded)
4
M1
enter
The combination of M2, M1, and M0 determines the 8 working modes of the module (cannot be
suspended, if not used, it can be grounded)
5
M2
enter
The combination of M2, M1, and M0 determines the 8 working modes of the module (cannot be
suspended, if not used, it can be grounded)
6
RXD
enter
TTL serial port input, connected to the external TXD output pin; can be configured as open-drain or
pull-up input, see parameter settings for details
7
TXD
Output
TTL serial port output, connected to the external RXD input pin; can be configured as open-drain or
push-pull output, see parameter settings for details
