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• In some cases, a property "does not apply" to a device. accelerationRaw, for example, does not apply to the MP285. To make MP285 a concrete class, accelerationRaw must be defined somewhere in a properties block; however, for the MP285, the this property doesn't do anything (its get-method always returns NaN, and there is no set-method). Your device may similarly "omit" inapplicable properties. Note however that the ScanImage application will expect certain properties to be

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• present and working. See #Minimal LSC Implementation for ScanImage below.

• The MP285 has two "resolutionModes", 'fine' and 'coarse'. Each mode has its own velocity setting, so that the resolutionMode is queried when setting/getting the velocity property. The details related to resolutionMode are specific to MP285 and may not apply to your device; however they do illustrate the general pattern of having more than one mode.

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