Connecting Digital I/O Signals; Specifications - National Instruments BNC-2120 Installation Manual

The designated space next to each USER <1..2> BNC is for marking or labeling signal names.

Connecting Digital I/O Signals

Connect to the digital I/O signals of your DAQ device to the digital I/O screw terminals, P0.<0..7>, on
the BNC-2120. You can individually configure each signal as an input or output. D GND is available at
the screw terminals to supply the reference for the DIO signals. When connecting signals to the screw
terminals, use 28–16 AWG wire with the insulation stripped to 0.28 in.
Note P0.6 and P0.7 can control the up/down signal of general-purpose counters 0 and 1,
respectively. Refer to the
using the P0.6 and P0.7 terminals with the quadrature encoder.
The LEDs next to each screw terminal indicate the state of each digital line, as listed in Table 3.
Digital I/O LED
Lit
Not lit

Specifications

This section lists the specifications of the BNC-2120. These specifications are typical at 25 °C unless
otherwise specified.
Note Refer to your DAQ device documentation for specifications about analog input, analog output,
trigger/counter, and digital and timing I/O signals.
© National Instruments Corporation
BNC Cable
PFI 8
Signal
Figure 6. Connecting PFI 8 to USER 1 BNC
Using the Quadrature Encoder
Table 3. Digital I/O LEDs
The port is either pulled high or driven high
The port is either pulled low or driven low
TIMING I/O
Screw Terminal Block
PFI 8/P2.0
PFI 9/P2.1
PFI 12/P2.4
PFI 13/P2.5
PFI 14/P2.6
+5 V
D GND
USER 1 BNC
Internal
Connection
D GND
section for more information about
Digital Port State
11
Wire
USER 1
BNC-2120 Installation Guide