1. Compatible with TTL/RS485 standard, converts TTL signals into differential RS485 signals, supports half duplex communication. Compatible with 3.3V5V TTL signal levels, features anti reverse and over voltage protection for the power supply interface. 2. Built in integrated power supply isolation, provides stable isolated voltage without requiring an additional power supply for the isolated terminal. Built in integrated digital isolation, enables signal isolation, reliability, strong anti interference, and low power consumption. 3. Equipped with onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spikes in the circuit, offering lightning and electrostatic protection. Includes a resettable fuse and protection diodes to ensure stable current/voltage output, providing over current/over voltage protection and enhancing shock resistance. 4. Features an onboard 120Ω resistor for RS485 output terminals, switch enabled/disablable. Industrial rail mount ABS enclosure design, compact size, easy installation, and cost effective.