| 1 |
5V |
Jumper short connected with VCC，for power input |
| 2 |
VCC |
Power input |
| 3 |
3.3V |
Jumper short connected with VCC，for power input |
| 4 |
GND |
Ground |
| 5 |
VCC |
Power input |
| 6 |
NC1 |
/ |
| 7 |
NC2 |
/ |
| 8 |
NC3 |
/ |
| 9 |
RXD |
RXD，to connect TXD of module for test |
| 10 |
TXD |
TXD，to connect RXD of module for test |
| 11 |
AUX |
Check more from manual of E22 module |
| 12 |
M1 |
Pin M1 for mode selection，suspending means“1”，when short connected with |
| GND, it is“0” 13 GND Ground，often work with M1 |
| 14 |
M0 |
Pin M0 for mode selection，suspending means“1”，when short connected with |
| GND, it is“0” |
| 15 |
GND |
Ground，often work with M0 |
Pin Definition
