NI WSN-3230/3231 User Guide and Specifications
22
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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 DIO
x
and connect the device common to the DGND terminal corresponding
to that DIO
x
terminal.
•
The DIO
x
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).
Figure 19.
Connecting a Device to the NI WSN-3230/3231 in Drive High Mode
Drive Low (Sinking)
Drive Low (Sinking) mode is for devices that require low side drive or a sinking output. When using
this mode:
•
The DIO
x
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.
•
The channel is high impedance when the channel is turned off (1).
•
When driving inductive loads, use an external flyback diode or snubber circuit as shown in
Figure 20.
Figure 20.
Connecting a Device to the NI WSN-3230/3231 in Drive Low (Sinking) Mode
DIO
x
DGND
Extern
a
l
Power
Su
pply
+
–
Device
DIO PWR
High
S
ide
S
witch
DI
(Intern
a
l)
NI W
S
N-
3
2
3
0/
3
2
3
1
DIO
x
Fly
ba
ck Diode
DGND
Low
S
ide
S
witch
DI
(Intern
a
l)
Extern
a
l
Power
Su
pply
+
–
NI W
S
N-
3
2
3
0/
3
2
3
1
Device
