Long-distance wireless RS232 adapter without power supply
Abstract: RS232 interface is one of the traditional communication interfaces. When used in traditional cable connection mode, its resistance to common mode noise is weak, the actual transmission distance is short (generally no more than 15 meters), and the long distance without power supply The wireless RS232 adapter (BLE232-NEP) converts RS232 signals into Bluetooth wireless signals, so there is no common mode noise interference and signal compatibility issues. The signal can be transmitted through the wall, and the transmission distance can reach 100 meters in an open environment, and plug and play without external power supply.
RS232 interface is one of the traditional communication interfaces. When used in traditional cable connection mode, its resistance to common mode noise is weak, and the actual transmission distance is short (generally no more than 15 meters), while the long-distance wireless RS232 without power supply The adapter (BLE232-NEP) converts RS232 signals into Bluetooth wireless signals, so there is no common mode noise interference and signal compatibility issues. The signal can be transmitted through the wall, and the transmission distance can reach 100 meters in an open environment, and plug and play without external power supply.

Application scenario

Traditional cable replacement
Two wireless adapters are interconnected via Bluetooth to realize the replacement of the traditional RS232 connection line

Online debugging
The wireless adapter is connected to the computer via Bluetooth to realize the online debugging of the RS232 interface device
 

Wireless interconnection
The RS232 device connects to the Bluetooth gateway through a wireless adapter to realize the "Internet of Everything"
 

Technical Principle
RS232 serial port is a commonly used serial communication method, and its standard protocol does not specify the power supply pin, so it is impossible to directly plug the device into the RS232 interface for use. The serial port power collection technology uses advanced fragmented power collection technology to collect the power on the RS232 signal line for use by the CH9140 low-power serial port to the Bluetooth chip.

BLE232-NEP
Power-free long-distance wireless RS232 adapter

Through the power conversion module, the voltage on the signal line is converted into the desired voltage, and at the same time, the RS232 signal is converted into a TTL signal by the level conversion module. The overall block diagram is shown above↑