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GpIo for Power clipper on J8 and J9


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General purpose I/O on the Power Clipper is 5V CMOS, both for inputs and outputs -- bidirectional buffers are used. The intent for outputs is that people add whatever type of drivers they choose.


The Clipper breakout board provides optically isolated outputs rated to 24V, sinking or sourcing by user wiring.

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I just had a similar Delta Tau support question, perhaps for the same thing.... Anyhow, I assembled some information that might be helpful.

Bits 0 to 15 of GpioDir[0] and GpioPol[0] correspond to io data points 0 to 15 on JTHW (J8), respectively. Similarly, bits 16 to 31 of GpioDir[0] and GpioPol[0] correspond to data points 0 to 15 on JOPT (J9). This is illustrated in the attached picture of an Excel table (couldn't attach the Excel file).

The columns on the right show the settings for your setup which would be:


Clipper[0].GpioDir[0] = $FFFF0000

// Direction Control for JTHW all inputs and JOPT all outputs (1=out, 0=in)


Clipper[0].GpioPol[0] = 0

// All non-inverted (When non-inverted, GpioData=1 corresponds to 5V and GpioData=0 corresponds to 0V)


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The outputs will provide either 0 volts or 5 volts CMOS, no pull-ups needed.


The inputs are only activated with 0 volts. Active high is OK, but then you need to provide 0 volts when not active. If the input devices are open when not activated, you could add pull-down resistors of about 470 ohms.

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