IEI Integration IVC-200G - Manual (Page 12)

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Connect the other end of the flat cable to the GPIO pin connector on
the GPIO daughter board.
Use the screw to secure the GPIO daughter board on your computer
case.
2.4.2 Connections for Input/Output devices
An input connector and an output connector are provided for
connections to the external devices. The connection points of the
input connector are shown in Figure 1. The connection points of the
output connector are shown in Figure 2.
GPIO daughter board
GPIO pin connector
Input 1
Ground 1
Input 2
Ground 2
Input 3
Ground 3
Input 4
Ground 4
Figure 1
Input Connector