6.Onboard self-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance 7.Fully automatic transceiver circuit with no delay, ensures the USB port communicates with different interfaces fastly and stably, without interfering with each other 8.Onboard TTL serial 3.3V/5V voltage translator, config the TTL level via switch 9.3 LEDs for indicating the power and transceiver status 10.High quality USB-B and RS232 connectors, smoothly plug/pull Industrial Grade Isolated USB Converter --USB TO RS232/485/422/TTL. CP2102 | Stable Transmission | Multiple Devices Applicable | Multi-OS Compatible. USB to RS232/485/422/TTL Converter with CP2102 Chip, Industrial Isolated USB Adapter with Multiple Protection, Support Multi Devices and Android, 11 / 10 / 8.1 / 8 / 7, Etc Multi System Colour:Black Material:Metal Package Contents: 1x USB TO RS232/485/422/TTL 1x USB type A to type B cable 1x Screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 3.Onboard unibody power supply isolation, provides stable isolated voltage, needs no extra power supply for the isolated terminal 2.Supports multiple communication interface conversion: USB to RS232, USB to RS485, USB to RS422, USB to TTL 5.Onboard (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, ESD protection 1.Adopt CP2102 chip, fast communicating, stable and reliable, better compatibilit 4.Onboard unibody digital isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption