Features 1)Onboard original CH343G and SP485EEN chips, built-in lightningproof tube, resettable fuse, ESD and TVS protection circuits, etc. 3) Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, light-ningproof & anti-electrostatic 4) Onboard resettable fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance 5) Transmission distance up to 1.2km: The USB signal can be converted into a balanced differential RS485 signal and the transmission rate is stable. The reliable speed is 300bps ~ 3Mbps, the transmission distance is about 1.2km for RS485, and about 5 meters for USB. Specifications Host port--USB Device port -- RS485 Operating system-- Linux, Android, WinCE, Windows 11 / 10 / 8.1 / 8 / 7 1)USB Operating voltage--5V Connector--USB-A Protection --200mA self-recovery fuse, ESD protection Transmission distance --About 5m 2)RS485 Connector-- Screw terminal Pins-- A+, B-, GND Direction control-- Hardware automatic control Protection-- 600W lightningproof and surge-suppress, 15KV ESD protection (onboard 120R balancing resistor) Transmission distance--About 1.2km(low rate) Transmission mode--Point-to-multipoints (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more) 3)LED indicators PWR--Red power indicator, light up when there is USB connection and voltage is detected TXD--Red TX indicator, light up when the USB port sends data RXD--Red RX indicator, light up when the device ports send data back 4) Operating environment Temperature :-15? ~ 70? Humidity--5%RH ~ 95%RH Online Tutorial/How to use Document: n9.cl/pmi4r Package Content USB TO RS485 (B) x1 USB-A male to female cable x1 Screwdriver x1