[ENHANCED ISOLATION] Optoelectronic isolator and 600W guard circuit provide up to 2500Vrms isolation, effectively suppressing ESD and common ground interference. [EFFORTLESS FAULT ISOLATION] Short circuit and open circuit guards on each port facilitate easy improvement of 485 bus structure and isolation of fault channels. [VERSATILE POWER OPTIONS] Wide voltage range of DC9-40V (500mA) external switch power supply, for outdoor engineering applications. [AUTOMATIC SWITCH CONTROL] Enables automatic switching of control circuit to address delay issues in 485 transfer and reception conversion. [EXPANDED CONNECTIVITY] Offers 1 channel 485 input and 8 channel 485 output, each isolated and supporting up to 128 nodes.