Chengdu Ebyte Electronic Technology Co., Ltd.
E22-230TXXS User manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd.
9
pull-up
）
be grounded).
21
M1
M1 Input
（
weak
pull-up
）
Work with M0 to decide 4 working modes of module (not suspended, if not used, could
be grounded).
22
RXD
Input
TTL UART inputs, connects to external (MCU, PC) TXD output pin.
23
TXD
Output
TTL UART inputs, connects to external (MCU, PC) RXD output pin.
24
AUX
Output
Used to indicate the working state of the module;
The user wakes up the external MCU and outputs low level during power on self-test
initialization; (can be suspended)
25
VCC
-
Module power supply positive reference
，
Power supply
：
2.3
～
5.5V DC
26
GND
-
Module ground
3.2 E22-230T30/33S pins
