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Appendix D: Signal Connection of MCU DI/DO
Digital Input
The GPIO connector (DIO, connector number: 12) for GPI signal (digital
signal input). The GPIO has 4 digital input channels by default.
Wet Contact (default)
The "GPI Active" needs to set to "Low" in Software Demo Utility as shown
below or SDK. The GPI signals have a pull up resistor to Vin Voltage internally.
Note: Example of GPI 1 and GPI 2 as a pair, and GPI 3 and GPI 4 as a pair.
The figure below shows how to connect an external output source to one
of the input channels.
Internal Sourcing (Default)
Internal
VCC
1: GPI1
2: GPI2
3: GPI3
4: GPI4
10: GND
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Dry Contact:
The "GPI Active" needs to set to "High" in Software Demo Utility as shown
below or SDK. The GPI signal will not have a pull up resistor internally.
Note: Example of GPI 1 and GPI 2 as a pair, and GPI 3 and GPI 4 as a pair.
The figure below shows how to connect an external source to one of the
input channels.
External
71
External Sourcing
Internal
1: GPI1
2: GPI2
3: GPI3
4: GPI4
10: GND
External
VCC
nROK 7251 Series User Manual
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