Digital Input - Nexcom VTC 1011 Series User Manual

Appendix D: Signal Connection of GPI/GPO

Digital Input

Wet Contact (default)
SW1 connector for GPI signal (digital signal input).
The SW1 has 4 digital input channels by default.
The GPI signals have 9~36V-in (12V@1.1mA/ 24V@2.2mA) internally.
The figure below shows how to connect an external output source to one
of the input channels.
GPI_0 1
GPI_1
2
GPI_2 3
GPI_3
4
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External GPI
Port
Switch Register
ON (Short) GND 1
OFF (Open) OPEN 0
55
Dry Contact:
Each channel can accept 0~33Vdc voltage.
The GPI needs to switch to "OFF" state. The GPI signal will not have a pull
up resistor internally when you switch "SW1" to "OFF" state.
The figure below shows how to connect an external output source to one
of the input channels.
GPI_0 1
GPI_1
2
GPI_2
3
GPI_3
4
External power
Resistor
External
Port
Switch Register
ON (Short) GND
OFF (Open) HIGH
VTC 1011 Series User Manual
GPI
1
0