[Frequency]:410.125~493.125MHz
[Power]:22dBm
[Distance]:5km
[Size]:21*36mm
[Weight]:6.7±0.2g
[Introduction]:E22-400T22D is a wireless serial port module (UART) based on SEMTECH LoRa solution. It has a variety of transmission modes, working at 410.125MHz~493.125MHz, frequency (default 433.125MHz), LoRa spread spectrum technology, TTL level output, compatible with 3.3V and 5V IO port voltage.
| Serial Number | pin | Pin direction | Remark |
| 1 | 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). |
| 2 | 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). |
| 3 | RXD | Input | TTL serial port input, connected to the external TXD output pin; |
| 4 | TXD | Output | TTL serial port output, connected to the external RXD input pin; |
| 5 | TO | Output | Used to indicate the module's working status; When the user wakes up the external MCU, it outputs a low level during the power-on self-test initialization period; (this level can be left floating). |
| 6 | VCC | Input | Module power supply positive reference, voltage range: 3.0~5.5V DC |
| 7 | GND | Input | Module ground wire |
| 8 | Fixing hole | Mounting hole (connected to GND on the module) | |
| 9 | Fixing hole | Mounting hole (connected to GND on the module) | |
| 10 | Fixing hole | Mounting hole (connected to GND on the module) |