Nexcom nROK 7251 Series User Manual page 88

Appendix D: Signal Connection of MCU DI/DO
Dry Contact
The "GPO PullUp" needs to set to "External" in Software Demo Utility as
shown below or SDK. The GPO signal will not have a pull up resistor internally.
Note: Example of GPO 1 and GPO 2 as a pair, and GPO 3 and GPO 4 as a pair.
The figure below shows how to connect an external input source to one of
the output channels.
External Sourcing
Internal
5: GPO1
6: GPO2
7: GPO3
8: GPO4
10: GND
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External
VCC
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nROK 7251 Series User Manual