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E48-900T20S Wireless module Frequency hopping,automatic retransmission.low power consumption 915MHz RF transceiver transparent transmission,serial port transceiver
[Introduction]：E48-900T20S is a domestic cost-effective wireless data transmission module launched by Chengdu Ebyte. It has 4 working modes. It has a variety of transmission methods and can be applied to various IoT application scenarios. The wireless module works in the 855~925MHz frequency band, has TTL level output, supports a maximum transmit power of 20dBm, and is compatible with 3.3V IO port voltage. It supports functions such as air wake-up, wireless configuration, relay networking, communication keys, etc. At the same time, the module has a data encryption function. Through strict encryption and decryption algorithms, it ensures data security and improves communication reliability and transmission efficiency.
| Pin number | Pin name | Pin direction | Pin usage |
| 1 | GND | - | Module ground wire |
| 2 | GND | - | Module ground wire |
| 3 | GND | - | Module ground wire |
| 4 | GND | - | Module ground wire |
| 5 | M0 | Input (very weak pull-up) | Cooperate with M1 to determine the 4 working modes of the module. (Can be left floating, the module contains a pull-up resistor) |
| 6 | M1 | Input (very weak pull-up) | Cooperate with M0 to determine the 4 working modes of the module. (Can be left floating, the module contains a pull-up resistor) |
| 7 | RXD | Input | TTL serial port input, connected to the external TXD output pin; |
| 8 | TXD | output | TTL serial port output, connected to the external RXD input pin; |
| 9 | AUX | output | Used to indicate the working status of the module. The user wakes up the external MCU and outputs low level during power-on self-test initialization. |
| 10 | VCC | - | Module power supply positive reference, voltage range: 2.7V ~ 5.5V DC |
| 11 | GND | - | Module ground wire |
| 12 | RST | - | Reset pin, active low |
| 13 | GND | - | Module ground wire |
| 14 | NC | - | - |
| 15 | NC | - | - |
| 16 | NC | - | - |
| 17 | NC | - | - |
| 18 | NC | - | - |
| 19 | GND | - | Module ground wire |
| 20 | GND | - | Module ground wire |
| 21 | ANT | - | antenna |
| 22 | GND | - | Module ground wire |