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Appendix D: Signal Connection of Programmable DI/DO
Digital Output
CN2 connector for GPO signal (digital signal output)
The CN2 connector has 4 digital output channels by default. The signal
connection of CN2 support 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 SW1 needs to switch to "ON" state. The GPO signal will have a pull up
resistor to 5V internally when you switch "SW1" to "ON" state. The output
signal has two states, one is low level (driven to 0V from GPO signal) other
is high level (driven to 5V from GPO signal).
The figure below shows how to connect an external input source to one of
the output channel.
VCC5
1K
1K
GPO2
GPO1
GPO4
GPO3
GPO5
GPO
Port
Register
1
HIGH
0
GND
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Internal
External
15
13
3
4
9
14
GPIO_GND
CN2
Dry Contact
Each channel can accept 3~18Vdc voltage. And it is able to drive 150mA
current for low level.
The SW1 needs to switch to "OFF" state. The GPO signal will no have a pull
up resistor internally when you switch "SW1" to "OFF" state.
The figure below shows how to connect an external input source to one of
the output channel.
GPO2
GPO1
GPO4
GPO3
GPO5
GPO
Port
Register
1
OPEN
0
GND
61
Internal
External
7
13
3
4
External power
9
14
GPIO_GND
Resistor
CN2
VTC 1020 and nROK 1020 Series User Manual
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