E43-433TB-01 Module test board
[Interface]：USB
[Size]：58*28mm
[Introduction]：E43-433TB-01 is a set of test kits formed by serial SMD serial port module combined with USB to TTL serial port for customer’s testing and development, which greatly reduces the difficulty of testing and development.
| Pin | Value | Function |
| 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 |