Possible GPIO configurations:
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7 inputs 3.3V
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7 inputs 5-24V
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6 inputs 3.3V + power supply on pin 7 (3.3V or device power supply)
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6 inputs 5-24V + power supply on pin 7 (3.3V or device power supply)
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6 inputs 3.3V + 1 output OC
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6 inputs 5-24V + 1 output OC
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5 inputs 3.3V + 1 output OC + supply on pin 7 (3.3V or device power supply)
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5 inputs 5-24V + 1 output OC + supply on pin 7 (3.3V or device power supply)
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5 inputs 3.3V + 2 outputs OC
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5 inputs 5-24V + 2 outputs OC
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4 inputs 3.3V + 2 outputs OC + supply on pin 7 (3.3V or device power supply)
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4 inputs 5-24V + 2 outputs OC + supply on pin 7 (3.3V or device power supply)
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7 outputs 3.3V
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7 outputs 5V
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6 outputs 3.3V + power supply on pin 7 (3.3V or device power supply)
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6 outputs 5V + power supply on pin 7 (5V or device power supply)
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6 outputs 3.3V + 1 output OC
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6 outputs 5V + 1 output OC
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5 outputs 3.3V + 1 output OC + power supply on pin 7 (3.3V or device power supply)
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5 outputs 5V + 1 output OC + power supply on pin 7 (5V or device power supply)
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4 outputs 3.3V + 2 outputs OC + power supply on pin 7 (3.3V or device power supply)
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4 outputs 5V + 2 outputs OC + power supply on pin 7 (5V or device power supply)
16