1. By using an isolation chip, the power and signals are isolated. The isolation and bus protection functions provide extremely EMC (electromagnetic compatibility) and EMI (electromagnetic interference) performance. During longdistance transmission, the 'ground' terminal of the module must be grounded. This plays a very good role in noise suppression and lightning protection, making the 485 bus safer. For shortdistance indoor transmission, grounding may not be . 2. It enables automatic flow control of the RS485 signal and automatic switching of the sending and receiving directions. Using this module is as simple as operating a serial interface. It fully incorporates lightning protection and noise suppression design for the 485 bus. 3. Module Description: This product achieves isolation of TTL and RS485 signals, power supply on both sides, and noise suppression capability through a end isolation chip. The power supply supports a wide voltage input (3.0V–5.5V), ensuring compatibility between 3.3V and 5.0V systems. Communication signals of 3.3V or 5.0V can be adapted. 4. This transparent transmission module enables mutual conversion between TTL signals and RS485 signals. However, it should be noted that this communication mode supports bidirectional 485 communication but cannot transmit in both directions simultaneously. Communication must alternate, meaning each end of the communication channel can be the sending or receiving end, but information can only be transmitted in one direction at a time.