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70
Appendix A: GPIO Connection
VMC 3020 User Manual
a
PPendIx
a: g
PIo
C
onneCtIon
Digital Input
The figure below shows how to connect an external output source to one
of the input channel.
MCU-DI1
MCU-DI2
MCU-DO1
MCU-DO2
DB9-FEMALE-90-5.08mm
5
9
4
8
3
7
2
6
1
Internal
External
External Power
External Resistor
External
Switch
Port
DI
Register
ON (Short)
GND
0
OFF (Open)
HIGH
1
The figure below shows how to connect an external input source to one of
the output channel.
Digital Output
MCU-DI1
MCU-DI2
MCU-DO1
MCU-DO2
DB9-FEMALE-90-5.08mm
5
9
4
8
3
7
2
6
1
Internal
External
External Power
External Resistor
DO
Register
Port
1
OPEN
0
GND