National Instruments Data Acquisition Device NI USB-621x - Manual (Page 87)

Chapter 6 Digital I/O
© National Instruments Corporation 6-7 NI USB-621x User Manual
Figure 6-4. USB-6212/6216 Digital I/O Connections
Caution Exceeding the maximum input voltage ratings, which are listed in the
NI USB-621x Specifications, can damage the DAQ device and the computer. NI is not
liable for any damage resulting from such signal connections.
Getting Started with DIO Applications in Software on USB-6212/6216
Devices
You can use the USB-6212/6216 device in the following digital I/O
applications:
• Static digital input
• Static digital output
Note For more information about programming digital I/O applications and triggers in
software, refer to the NI-DAQmx Help or the LabVIEW Help in version 8.0 or later.
+5 V
LED
TTL Signal
+5 V
Switch
I/O Connector
D GND
USB-6212/6216 Device
P0.<0..3>
P1.<0..3>
Digital
Isolators
Isolation
Barrier
(USB-6216
devices only)
When using a
USB-6216,
you must connect
D GND and/or AI GND
to the local ground
on your system.