Figure 10. Attaching External LEDs
External
LED
+5 V
OEM (On-Board)
7
6
1
External
Resistor
Power Switch
Use the power switch to power the NI USB-7856R OEM device on and off. The following
figure shows the pins on the power switch and power circuitry.
Figure 11. Power Switch (Shown in the On Position)
VDC Out
100 k
Ω
to Ground
VDC In
Switch
1
2
3
NC
NC
SW2
SW2
3
Power to
Device
J8
Power
Connector
1
2
1
2
Connector
J8
1
2
F1
ON
ON
100 k
Ω
100 k
Ω
The following table lists the pin locations and signal descriptions.
12 | NI USB-7856R OEM User Manual | ni.com
