Waveshare 25219 Industrial USB To 4Ch RS485 Converter Features: 1. Expand USB to 4-channel RS485, allowing each channel to communicate concurrently and independently 2. Onboard TVS (transient voltage suppressor), effectively suppresses surge voltages and transient peak voltages in the circuit, and protects against lightning and static electricity 3. Onboard self-restoring fuse and protection diode ensure stable currentvoltage output, provide over-currentover-voltage protection, and improve shock-proof performance 4. Onboard RS485 output terminal 120R resistor, enableddisabled by DIP switch 5. Aluminum alloy shell, oxidized matte surface, CNC process opening, sturdy and durable, excellent workmanship Product parameters: 1. Host port: USB 2. Device interface: RS485 3. Baud rate: 1200bps-460800bps 4. USB: Working voltage: 5V Connector: USB-B Protection: 500mA resettable fuse, ESD protection Transmission distance: about 5m 5.RS485 Connector: screw terminal Protection: 600W lightning surge protection, 15KV ESD protection Transmission distance: Maximum communication distance is about 1200m (low speed, turn on 120R resistor) Transmission method: point-to-multipoint (up to 32 nodes, repeaters are recommended for more than 16 nodes) 6. Temperature: minus 40 degrees Celsius - 85 degrees Celsius 7. Humidity: 5%RH-95%RH 8. Operating system: Win788.11011, Mac, Linux, Android 9. Product size: 86.2 x 48 x 27.2mm 10. Weight: 181 grams Packing list: -USB to 4-way RS485 x1 -USB Type A to Type B cable 1.2m x1