National Instruments WSN-3226 User Manual And Specifications page 21

Note You can connect only one external DIO PWR supply to the NI WSN-3226.
The power supply provides the current for the devices you connect to the NI WSN-3226. Connect the
power supply positive lead to DIO PWR terminal and the power supply negative lead to one of the
DGND terminals. The DIO PWR terminal on the NI WSN-3226 is internally connected to each digital
channel. Refer to the
Note The Drive High (Sourcing) and
external power supply connected to the DIO PWR terminal.
Drive High (Sourcing)
Drive High (Sourcing) mode is for devices that require high side drive or a sourcing output. When using
this mode:
• Connect the device to DIOx and connect the device common to the DGND terminal corresponding
to that DIOx terminal.
• The DIOx terminal is driven to the voltage supplied to DIO PWR when you turn on the channel.
• Writing a digital value of 1 turns on the channel, and 0 turns off the channel.
• The channel is high impedance when the channel is turned off (0).
Drive Low (Sinking)
Drive Low (Sinking) mode is for devices that require low side drive or a sinking output. When using
this mode:
• The DIOx terminal is pulled to DGND when you turn on the channel.
• Writing a digital value of 0 turns on the channel, and writing a digital value of 1 turns off the
channel.
© National Instruments Corporation
Specifications section for information about the power supply voltage range.
High Side Switch
DI
(Internal)
NI WSN-3226
Figure 18. Connecting a Device to the NI WSN-3226 in Drive High Mode
Drive High and Low (Sinking and Sourcing)
DIO PWR
DIOx
Device
DGND
21
modes require an
+ External
Power
– Supply
NI WSN-3226 User Guide and Specifications