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Appendix C: Signal Connection of MCU DI/DO
Digital Input
J13 connector for GPI signal (digital signal input)
The J13 has 4 digital input channels by default.
Wet Contact (default)
The GPI signals have a pull up resistor to Vin Voltage internally.
The figure below shows how to connect an external output source to one
of the input channels.
Internal
VCC
1K
1K
J13
CON_GPI1
10
CON_GPI2
9
CON_GPI3
8
CON_GPI4
7
CON_GPI5
6
CON_GPO1
5
4
GPIO_PW
3
2
GPIO_GND
1
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External
GPIO_GND
External
Port
Switch
ON (Short)
GND
OFF (Open)
OPEN
Dry Contact:
CON_GPI1
CON_GPI2
CON_GPI3
CON_GPI4
CON_GPI5
CON_GPO1
GPIO_PW
GPIO_GND
GPI
Register
0
1
62
Internal
External
J13
10
9
8
7
6
5
External power
4
3
GPIO_GND
2
1
Resistor
External
Switch
ON (Short)
OFF (Open)
VTC 6222 and nROK 6222 User Manual
GPI
Port
Register
GND
0
HIGH
1
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