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Why must I supply power to the AS-BADU-211 analog input module prior to powering the CPU?

FA199371

4/02/2014

If left unpowered, the AS-BADU-211 will try to pull power from the 5 volt supply on the CPU. As a result of this the BADU-211 will give a false ready and active indication. Although the module is providing correct indications the analog input signals will not be read correctly. Always power up this module prior to the CPU.