Bidirectional interface for interconnecting two devices and the interface having first optical isolator and second optical isolator being powered by first and second device ports

摘要

An interface having two optical isolators which produce bidirectional communication interfaces between first and second devices. The first device provides positive, negative and neutral ports to its portion of the interface. The second device provides first and second power ports for its portion of the interface. The power ports are independent of the signals or data inputs and outputs of the interface and are used to power their portion of the interface and define the two levels of signals necessary at each output of the interface. The positive and negative ports of the interface are from the first device which preferably is a computer and are signals provided on unused data or control signal ports. The interface may be incorporated into the second or non-computer device.