Hand-Held Diagnostic Controller for ITS Field Maintenance Phase II
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2019-10-11
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Edition:Final Report April 2017 – Sept. 2019
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Abstract:The Caltrans field element network includes several hundred changeable message signs (CMS), generically referred to as dynamic message signs (DMS), and many more closed-circuit TV (CCTV) cameras. The number of these elements motivates development of diagnostic tools that are handheld, quick, inexpensive, and straightforward for maintenance staff. The AHMCT Research Center worked with the Caltrans Division of Research, Innovation and System Information (DRISI) to develop a solution to this need. The solution is composed of off-the-shelf smartphones and tablets, wireless interfaces, and two apps for field element communications, diagnostics, and control. One app addresses DMS field elements, while the other addresses CCTV field elements. This report presents the overall Handheld Diagnostic Controller (HHDC) concept, design, and implementation details, including architecture, protocols, and configurations for a few representative districts. The details include discussion of DMS and CCTV app software and use cases, as well as the ruggedized HHDC hardware kit. The report also presents the evaluation and selection of a console app for inclusion with the HHDC in order to support diagnostics and control of other field elements.
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