Four optically isolated RS485 HUB : Model : RS485-HUB-4A ( optical isolation between the main branches , optical isolation between each branch) ( Industrial grade , anti-static , anti-jamming , grade-2 TVS 600W lightning protection, B3D090L 90V5KA) Four optically isolated RS485 hub (RS485-HUB-4A) is designed for solving the complex electromagnetic environment RS485 large system requirements and design RS485 bus split hub (HUB). 485 hubs using ASIC implementation softswitch . Built- 4 DC / DC isolation module , RS485 output interface with high-speed optocoupler 2500V optical isolation and grade-2 anti-lighting protection, TVS 600W lightning protection lightning , B3D090L 90V5KA lightning discharge can effectively prevent static from the RS485 bus , lightning , surge and ground damage and poor equipment . In RS485 mode, the judging circuit used can detect data flow direction, and automatically switch to control circuit , RS485 transceivers convert easily solve the latency problem. RS485 interface transmission distance is greater than 1500 m , stable performance. Widely used in highway toll systems, road monitoring system and power collection system , is a high performance, excellent price data interface conversion products. Four optically isolated RS485 hub (RS485-HUB-4A) provides star RS485 bus connection . Each port has a short circuit, open circuit protection, all- optical isolation, users can easily improve the RS485 bus structure , dividing segments , improve communication reliability . When lightning strikes or equipment failure generates, network problems will be isolated in order to ensure the normal operation of other segments. This capability greatly improves the reliability of existing RS485 network , effectively shortening the network maintenance time . The left terminal arrangement as follows: ( product labels marked ) 1 ---------- GND4 slip 4 - Signal ground ( optical isolation with other signal ground ) 2----------D-/B4