U485D

USB Interface: USB Type-A Male (Plug and Play) Communication Standard: RS485 Operating Voltage: 5V (powered via USB) Data Transmission Rate: Up to 12 Mbps (USB), up to 10 Mbps (RS485, depending on cable quality) Communication Distance: Up to 1200 meters (RS485) Protection: Built-in TVS (transient voltage suppressor) diodes for surge protection ESD Protection: ±15 kV Operating Current: ~50–150 mA (varies by load) Operating Temperature Range: -20°C to +85°C

RS485 Output (Terminal Block or Pins) A(+) / B(-): Differential RS485 lines GND: Common ground Some modules may also expose DE/RE (Driver Enable / Receiver Enable) pins Output interface can be: 3-pin terminal block (A/B/GND) or pin header/screw terminals

Driver Chip Variants Common USB-to-Serial chipsets used: CH340 (cost-effective, requires driver) FT232RL (premium, plug & play in most OS) CP2102 (widely supported)

Key Features Converts USB port to RS485 half-duplex serial interface Enables multi-point communication (up to 32 nodes on RS485 bus) Built-in surge protection, anti-static, and short-circuit protection Supports hot swapping (plug/unplug without restarting system) Compact, rugged design ideal for field/industrial environments LED indicators for TX/RX activity (on many models)

Applications Industrial automation and control systems Modbus RTU communication between PC and device Remote meter reading and monitoring systems or microcontroller communication via RS485 Building automation (BMS), HVAC systems SCADA/HMI panel interfacing