For your immediate needs, I suggest you use the Imager API (http://docs.rhomobile.com/rhoelements/imager/) to take a picture on the ET1.
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Thanks for the reply. As to your suggestion to use the 'Imager' API, I was using that in version 22.214.171.124 but it is no longer compatable with the 'Scanner' API in version 126.96.36.199. My application uses the SE4500-DL scanner attachment and has the ability to capture images. Unfortunately I can't stay with version 188.8.131.52 and have the ability to capture images as base64 encoded strings using the rear camera (front cam only supports this).