Feature: 1. The hub can prevent bus failure and damage caused by the voltage difference between the power supplies at both ends of the master and slave. 2. This RS485 hub can be optoelectronic isolated, automatically sensed, stable performance, and high‑speed transmission. 3. Safety protection, signal port with reverse connection, short‑circuit alarm indication and can automatically isolate faulty channels. 4. The internal processor chip can automatically identify and control the data direction without external intervention. 5. Using industrial-grade quality, the core chips are all imported with original packaging, which is stable and durable. Specification: Item Type: RS485 Hub Material: ABS Model: YN5204 Working Power Requirements: Voltage in the Range of DC9-24v, Current Greater Than 0.75a Specifications Interface Characteristics: Compatible with EIA/TIA RS232, RS485 Standards Electrical Interface: RS-485: Plug Terminal RS-232: Db9 Serial Port Female Interface Protection RS485: 600w Thunder Surge Protection RS-232: ±15kv ESD Protection Transmission Medium: Twisted Pair or Shielded Twisted Pair Number of Nodes: Max128 Terminal Resistance: Four Slave Ports Built-in 120 Ohm Terminal Resistance Transmission Rate: 1200bps to 115.2kbps Isolation Voltage: 1000vdc Power Consumption: 1.5w at DC 10~30v Maximum Transmission Distance: 1200m(4000ft) at 19.2kbps Status Indication: Real-time Display of the On-board Transceiver Indicator Working Temperature: -30℃~+75℃ Storage Temperature: -40℃~+85℃ Working Humidity: 25%~95% (non-condensing) Storage Humidity: 0%~95% (non-condensing). Package List: 1 x RS485 Hub Note: Please use within the working voltage range of the parameter