Abstract: A system, method, and apparatus for measuring a workspace is provided. The method includes capturing a workspace that is virtually represented on a user interface display of a computing apparatus that image-captured the workspace. The user inputs, via the user interface, a value of a known measurement of a length represented in the virtual workspace. Through the user interface, along the virtual workspace, the user identifies virtual end boundary points of the length associated with the known measurement. The user then defines a defined space within the virtual workspace by placing additional virtual boundary points. The system calibrates from the inputted value and the virtual end boundary points of the known measurement all the remaining measurements of the surface area, which can be used to render a map display and calculate surface area, volume, or any other geometric aspects of the defined space.

Abstract: Envisages the use of a format of serial digital signalling in which each data word comprises a predetermined number of bytes formed by bits of substantially uniform duration and in which each byte comprises a "start" bit of a first binary significance (e.g. 0) a "stop" bit having a second binary significance (e.g. 1) and an identical plurality of "data" bits immediately succeeding said "start" bit and in which the final byte of the data-word is characterized in that it has an additional bit having said first binary significance 0 interposed between last "data" bit and the "stop" bit thereof. The reading of that bit immediately succeeding the last "data" bit of each byte of each data-word of a transmission produce a so-called synchronizing pulse-sequence comprising bits of said second significance for all bytes except that last and a bit of said first significance for the last byte.A response circuit is provided normally to maintain byte-to-byte synchronization.