E31-433T30S UART AX5243 chip wireless serial port module
[Chip solution]：AX5243
[Working frequency]：425~450.5MHz
[Transmit power]：30dBm
[Communication distance]：6km
[Interface type]： UART
[Product weight]：5.1±0.1g
[Introduction]：E31-433T30S is a 433M SMD wireless serial port module (UART) with AX5243 radio frequency chip imported from AXSEM from Switzerland. It has half-duplex, integrated transceiver and transparent transmission mode, 425~450.5MHz frequency band (default 433MHz), TTL level output , with air wake-up function (ultra-low power consumption).
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| No. | Pin | Pin Direction | Remarks |
| 1 | M0 | Input (very weak pull-up) | Cooperate with M1 to determine the working mode of the module (cannot be left floating, can be grounded if not used) |
| 2 | M1 | Input (very weak pull-up) | Cooperate with M0 to determine the working mode of the module (cannot be left floating, can be grounded if not used) |
| 3 | RXD | enter | TTL serial port input, connected to the external TXD pin (can be configured as open-drain or pull-up input, see manual for details) |
| 4 | TXD | output | TTL serial port output, connected to the external RXD pin (can be configured as open-drain or push-pull output, see manual for details) |
| 5 | AUX | output | Indicates the working status of the module, the user wakes up the MCU externally, and outputs low level during power-on self-test initialization. |
| 6 | VCC | - | Module power supply positive reference, voltage range: 3.3V~5.2V DC |
| 7 | GND | - | Module power ground |
| 8 | RESET | enter | Reset pin when program is loaded (floating, user does not need to connect) |
| 9 | GND | - | The point in place when the program is loaded (floating, the user does not need to connect) |
| 10 | SWIM | enter | SWIM pin when program is loaded (floating, user does not need to connect) |
| 11 | +3.3V | - | Power pin when program is loaded (floating, user does not need to connect) |
| 12 | PD3 | input Output | NC pin, this pin needs to be left floating and the user does not need to connect it (for subsequent expansion use) |
| 13 | PD2 | input Output | NC pin, this pin needs to be left floating and the user does not need to connect it (for subsequent expansion use) |
| 14 | PD1 | input Output | NC pin, this pin needs to be left floating and the user does not need to connect it (for subsequent expansion use) |
| 15 | GND | - | Fixing hole |
| 16 | GND | - | Fixing hole |
| 17 | GND | - | Fixing hole |
| 18 | ANT | output | Antenna interface (high frequency signal output, 50Ω characteristic impedance) |