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Appendix D: Signal Connection of MCU DI/DO
Digital Output
The GPIO (DIO, connector number: 12) connector for GPO signal (digital
signal output). The GPIO connector has 4 digital output channels by default.
The signal connection of GPIO supports two connected methods for output
signal type. The output signal has two states, one is low level (driven to 0V
from GPO signal) other is open (high voltage is provided from external device).
Wet Contact (default)
The "GPO PullUp" needs to set to "Internal" in Software Demo Utility as
shown below or SDK. The GPO signal will have a pull up resistor to Vin
Voltage internally.
Note: Example of GPO 1 and GPO 2 as a pair, and GPO 3 and GPO 4 as a pair.
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The figure below shows how to connect an external input source to one of
the output channels.
Internal Sourcing (Default)
Internal
VCC
5: GPO1
6: GPO2
7: GPO3
8: GPO4
10: GND
72
External
nROK 7251 Series User Manual
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