Adopts original FT232RNL chip fast communicating stable and reliable better compatibilityOnboard TVS (Transient Voltage Suppressor) effectively suppresses surge voltage and transient spike voltage in the circuit lightningproof & anti-electrostaticOnboard self-recovery fuse and protection diodes ensure the current/voltage stable outputs provide over-current/over-voltage proof improve shock proof performanceOnboard RS232/485 communication switching circuit configured by switchOnboard 120R terminal resistor on the RS485 interface enabled/disabled via switch3 LEDs for indicating the power and transceiver status. Adopts ABS protection case compact size portable and easy to use cost-effective