Specifications 1.USB Operating voltage : 5V Connector: USB-B Protection : 200mA self-recovery fuse, isolated output 2.RS232 Connector: DB9 male Protection: TVS diode, surge protection & ESD protection Transmission mode: Point-to-point Baud rate: CH343G: up to 600000 bps (not full band) 3.RS485 Connector: Screw terminal Pins: A+/B-/GND Direction control: Hardware automatically discriminates and controls the direction of data transmission Protection : 600W lightningproof and surge-suppress, 15KV ESD protection (reserved 120R balancing resistor solder pads Transmission mode: Point-to-multipoints (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more) Baud rate: CH343G: up to 2 Mbps (not full band) 4. TTL (UART) Operating voltage: 3.3V / 5V Connector : Screw terminal Pins: TXD, RXD, GND, 5V Protection: clamp protection diode, over-voltage/negative-voltage proof, shock resistance Transmission mode : Point-to-point Baud rate : CH343G: up to 2 Mbps (not full band) 5.Indicators PWR: Red power indicator, light up when there is USB connection and voltage is detected TXD: Green TX indicator, light up when the USB port sends data RXD: Blue RX indicator, light up when the device ports send data back 6. Operating environment Temperature: -15? ~ 70? Humidity: 5%RH ~ 95%RH How-to-use document/User Manual://bit.ly/3WQXBJz Package Content USB Converter x1 USB Cable ~1.2m x1