Communication interface, USB to RS-485

The USB-485 unit is designed to connect to (and be powered by) the USB port of a host computer. It supplies the data at the required RS-485 communications protocol necessary for door controllers and enables the controllers to have plug and play capability. Up to 32 door controllers can be connected together on an RS-485 multi-drop network. Installed between the host and the door controllers, the USB-485 permits a -œdaisy-chain" configuration thus extending the maximum transmission distance to 1,200 m (4,000 ft).