Feature: 1. Prevent bus failure and damage caused by the voltage difference between the power supplies at both ends of the master and slave. 2. Photoelectric isolation, automatic sensing, stable performance, high?speed transmission. 3. Safety protection, signal port with reverse connection, short-circuit alarm indication and can automatically isolate faulty channels. Specification: Item Type: RS485 Hub Material: ABS Model: YN1208 Working Power Requirements: Voltage in the Range Of DC9-24V Interface Characteristics Compatible: EIA/TIA RS-232, RS-485 Standards Electrical Interface: Pluggable Terminal Block Working Mode: Asynchronous Half-Duplex Interface Protection: 600W Thunderstruck Surge Protection Transmission Medium: Twisted Pair or Shielded Twisted Pair Maximum Number Of Nodes: 32 (128 Can Be Customized) Transmission Rate: 1200bps to 115.2kbps (187.5K Can Be Customized) Isolation Voltage: 1000VDC Photoelectric Isolation Power Consumption: 2W at +9?24VDC Maximum Transmission Distance: 1200m (4000ft) at 9600bps Status Indication: Real-Time Display of On-Board Transceiver Lights Working Temperature -20?~+65? Working Humidity 25%~95% (Non-Condensing) Package List: 1 x RS485 Hub 1 x English User Manual Note: 1. After connecting the positive and negative poles of the power supply, the Power light should be in a steady green state. 2. Working power requirements: voltage in the range of 9 to 24V, current greater than 0.75A