1. By using an isolation chip, current and signals are isolated. The isolation and bus protection functions provide extremely EMC (electromagnetic compatibility) and performance (electromagnetic interference). When transmitting over long distances, the 'ground' terminal module can be grounded, which significantly enhances anti interference and lightning protection, making the 485 bus safer. However, for short distance indoor transmissions, grounding may not be achievable. 2. The module enables automatic flow control of the RS485 signal and automatic direction switching for transmission and reception. Operating this module is as simple as using a serial interface. It incorporates comprehensive lightning protection and noise suppression design for 485 buses. 3. Module Description: This product achieves complete isolation of TTL and RS485 signals, as well as power supply isolation, along with strong anti interference capabilities, thanks to a performance isolation chip. It supports a wide input voltage range (3.0V–5.5V), ensuring seamless compatibility between 3.3V and 5.0V systems. Communication signals can be adjusted for either 3.3V or 5.0V operation. 4. This transparent transmission module enables bidirectional conversion between TTL and RS485 signals. However, it is important to note that while 485 communication is bidirectional, it cannot occur simultaneously in both directions. Communication must alternate—each end can act as either the transmitter or receiver, but data can only flow in one direction at any given time.