Chapter 2 Hardware Overview ofthe NI PXI-7831R
© National Instruments Corporation 2-15 NI PXI-7831R User Manual
Figure 2-9. Analog Output Connections
Digital I/O
The NI PXI-7831R has 96 bidirectional DIO lines that can be individually
configured for either input or output. When the system powers on, the DIO
lines are all high-impedance. To set another power-on state, you can
configure the NI PXI-7831R to automatically load a VI when the system
powers on. This VI can then set the DIO lines to any desired power-on
state.
Connecting Digital I/O Signals
The DIO signals on the NI PXI-7831R MIO connector are DGND and
DIO<0..15>. The DIO signals on the NI PXI-7831R DIO connector are
DGND and DIO<0..39>. DIO<0..n> are the signals making up the DIO
port, and DGND is the ground reference signal for the DIO port. The
NIPXI-78 31R has one MIO and two DIO connectors for a total of 96 DIO
lines.
Refer to Figure B-1, NI PXI-7831R Connector Locations, and Figure B-2,
NIPXI-7831 R I/O Connector Pin Assignments, for the connector locations
and the I/O connector pin assignments on the NI PXI-7831R.
The DIO lines on the NI PXI-7831R are TTL compatible. When configured
as inputs, they can receive signals from 5V TTL, 3.3 V LVTTL,
5V CMOS, and 3.3V LVCMOS devices. When configured as outputs,
they can send signals to 5V TTL, 3.3 V LVTTL, and 3.3 V LVCMOS
Load
VOUT 0
+
–AOGND0
x8 Channels
NI PXI-7831R
AO0 Channel 0