| 主权项 |
1. In a touch screen system comprising two perpendicular axes populated with opposing photo emitters and photo receivers, wherein the system comprises a controller that controls pulsing of the photo emitters, polls an analog output from the photo detectors, decodes the analog output from the photo detectors, and reports corresponding coordinates to a host computer, and a series of daughter boards daisy chained together that include a chain of emitter boards, each emitter board having the capability of receiving data control signals from the controller or another emitter board, and each emitter board having the capability of transmitting said data control signals to other emitter boards in the chain, and a chain of receiver boards, each receiver board having the capability of receiving and sending data control signals from the controller or a receiver board, and each having the capability of transmitting said data control signals to other receiver boards in the chain, the improvement wherein there is a remote controller board with decode logic and A/D conversion circuit which sends and receives data to and from the controller and receiver boards, wherein an off axis scan on one axis is initiated by a prior course scan on one axis in which no break is detected and a prior course scan of the perpendicular axis in which a break is detected. |
