Item Type: RS485 Hub_x000D_Material: ABS_x000D_Model: YN1208_x000D_Working Power Requirements: Voltage in the Range Of DC9-24V_x000D_Interface Characteristics Compatible: EIA/TIA RS-232, RS-485 Standards_x000D_Electrical Interface: Pluggable Terminal Block_x000D_Working Mode: Asynchronous Half-Duplex_x000D_Interface Protection: 600W Thunderstruck Surge Protection_x000D_Transmission Medium: Twisted Pair or Shielded Twisted Pair_x000D_Maximum Number Of Nodes: 32 (128 Can Be Customized)_x000D_Transmission Rate: 1200bps to 115.2kbps (187.5K Can Be Customized)_x000D_Isolation Voltage: 1000VDC Photoelectric Isolation_x000D_Power Consumption: 2W at +924VDC_x000D_Maximum Transmission Distance: 1200m (4000ft) at 9600bps_x000D_Status Indication: Real-Time Display of On-Board Transceiver Lights_x000D_Working Temperature -20~+65_x000D_Working Humidity 25%~95% (Non-Condensing) 1Prevent bus failure and damage caused by the voltage difference between the power supplies at both ends of the master and slave. 2Photoelectric isolation, automatic sensing, stable performance, high?speed transmission. 3Safety protection, signal port with reverse connection, short-circuit alarm indication and can automatically isolate faulty channels. 4The internal processor chip automatically recognizes and controls the data trend without external intervention. Industrial?grade quality. 5The core chips are imported with original packaging, which is stable and durable. 1 x RS485 Hub 1 x English User Manual 1. After connecting the positive and negative poles of the power supply, the Power light should be in a steady green state._x000D_2. Working power requirements: voltage in the range of 9 to 24V, current greater than 0.75A