in an for controlling a feeder or feeder cart used in a pick - and - place electronics assembly machine , non - physical contact transmitters and receivers transfer data , such as feeder trigger signals , feeder ready signals , and component identification and usage information , between the feeder and / or feeder cart and the pick - and - place machine . wiring or other physical connections between feeder , feeder cart , and pick - and - place machine controls are not required . a common , universal interface between different types of feeders , feeder carts , and pick - and - place machines is possible .