NI DAQPad-6016 OEM User Guide
14
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Pin 1 is connected to VDC through the fuse (reference designator XF1).
The VDC is the voltage provided by the power supply through the power
connector (reference designator J10) and must be 9–25 V.
Pin 2 provides power to the circuitry on the DAQPad-6016 OEM. When
the switch is in the On position, the VDC power supply from pin 1 is routed
to pin 2.
Pin 3 connects pin 2 to ground when the switch is in the Off position.
This allows the charge on the DAQPad-6016 OEM to leak to ground when
it is powered off.
Figure 11 shows a schematic of the switch.
Figure 11.
Schematic of the DAQPad-6016 OEM Switch
Chassis Ground
Chassis ground provides a connection between the enclosure and USB
ground.
You can connect D GND to the chassis ground at three locations on the
device. By default, D GND is connected to the chassis ground at the bottom
edge of the board through two 0
Ω
resistors. The chassis ground directly
connects to USB ground, which connects to earth ground. Figure 12 shows
where the different grounds are and can be connected.
SW1
XF1
FUSE
3
Power to
Device
J10
Power
Connector
1
2
