Advantech ITA-3630 Series User Manual page 62

Intel gen2/gen3 coretm i7/i5/i3 fanless dual core compact industrial computer with wide voltage input

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PCA9554 has in all 4 registers to control GPIO.

PCA9554 register 0:

If one GPIO Pin is set to Input, you can read input value from the bit that register 0

corresponds to.

PCA9554 register 1:

If one GPIO Pin is set to Output, you can read input value from the bit that register 1

corresponds to.

ITA-3630 User Manual

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