[Frequency]：410.125～493.125MHz
[Power]：30dBm
[Distance]：10km
[Product weight]：5.7±0.1g
[Size]：25*40.5mm
[Introduction]：E22-400T30S is a wireless serial port module (UART) based on SEMTECH's LoRa solution. It has multiple transmission modes, LoRa spread spectrum technology, TTL level output, and is compatible with 3.3V and 5V IO port voltages.
| Serial Number | pin | Pin direction | Remark |
| 1 | GND | - | Module ground wire |
| 2 | VCC | - | Module power supply positive reference, voltage range: 3.3～5.5V DC |
| 3 | TO | Output | Used to indicate the module's operating status; outputs a low level during the power-on self-test initialization period when the user wakes up the external MCU ; (can be left floating). |
| 4 | TXD | Output | TTL serial port output, connected to the external RXD input pin; |
| 5 | RXD | Input | TTL serial port input, connected to the external TXD output pin; |
| 6 | M1 | Input (very weak pull-up) | In
conjunction with M0, it determines the module's four operating modes
(it cannot be left floating; if not in use, it can be grounded). |
| 7 | M0 | Input (very weak pull-up) | In conjunction with M1, it determines the module's four operating modes (it cannot be left floating; if not in use, it can be grounded). |
| 11 | ON | Output | Antenna interface (high-frequency signal output, 50 ohm characteristic impedance) |
| 12 | GND | - | Fixed |
| 13 | GND | - | Fixed |
| 14 | GND | - | Fixed |
| 18 | NC | - | Empty foot |
| 19 | NC | - | Empty foot |
| 20 | NC | - | Empty foot |
| 21 | NC | - | Empty foot |
| 22 | RESET | Input | The reset pin during program loading (floating, no user connection required). |
| 23 | GND | Input | Ground pin during program loading (floating, no user connection required). |
| 24 | NC | - | Empty foot |