What are the commonly used interfaces for wireless modules

By sdga:NiceRF Wireless Technology Co., Ltd

The commonly used interfaces of wireless modules are generally six types: USB, UART and SPI, TTL, RS232, and RS485. When explaining these interfaces in detail, let's first understand the specific role of the wireless module interface? The wireless module interface is used for communication between the module and different devices. For example, if we want to modify the communication protocol of the wireless module or the communication channel of the wireless module, we can do it through these interfaces.

wireless module

The above six types of interfaces are divided into two different types of interfaces. USB, UART, and SPI are physical interfaces (hardware), while TTL, RS232. RS484 are level-standard (electrical signal) interfaces.


USB interface of wireless module

The USB interface is a familiar interface method that everyone is familiar with. It is a universal serial bus and a serial bus standard for the communication between the wireless module and the computer system. Its advantage is that it is easy to use and plug and play.


UART interface of wireless module

The UART interface is a serial data bus, which is an asynchronous serial port. The bus can communicate in two directions. The hardware consists of two cables for sending and receiving.


SPI interface of wireless module

SPI interface is a kind of synchronous serial peripheral interface bus. The working mode is master-slave mode. One master device controls multiple slave devices. The advantages are fewer signal lines, simple communication protocol, and high data rate.


TTL interface of wireless module

The TTL interface is an interface that transmits data in parallel. Its advantage is that the TTL data signal output by the main control chip of the wireless module is directly transmitted to the input interface through the cable. The disadvantage is that the circuit has poor anti-interference ability and is prone to electromagnetic interference.


RS232 interface of wireless module

The RS232 interface is a standard interface for asynchronous transmission. It has two forms: DB-9 (9 pins) and DB-25 (25 pins). Computers generally have these two interfaces. We generally call these two interfaces. Two interfaces are COM1 and COM2.


RS485 interface of wireless module

RS485 is a standard that defines the electrical characteristics of drivers and receivers in a balanced digital multipoint system.

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