The USB485-ISO converts the short range USB output of the computer into the industry standard, long range RS485 protocol. It is used to communicate between the PC and LOR light controllers. Only one USB485-ISO is required to operate an entire network of LOR controllers. The USB485-ISO completely isolates the PC's USB connection from the RS485 network. This can be important when you have multiple network and each network is large. The USB485-ISO has a built in, isolated voltage booster that provides power for LOR accessories such as the RF-V4 wireless unit. FREE 6' USB cable include!