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

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.
P0.6 and P0.7 can control the up/down signal of general-purpose counters
Note
0 and 1, respectively. Refer to the
information about 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.
Refer to your DAQ device documentation for specifications about analog
Note
input, analog output, trigger/counter, and digital and timing I/O signals.
Analog Input
Number of channels (default) ...........................8 differential
Field connections (default) ...............................8 BNC connectors
Protection ..........................................................No additional protection provided.
Optional inputs
AI 0 ...........................................................Temperature sensor
AI 1 ...........................................................Thermocouple
AI 3, AI 11 ................................................Resistor measurement (requires RSE
Optional connections
Thermocouple..............................................Uncompensated miniature connector, mates with
Resistor .....................................................2 screw terminals
14 | ni.com | BNC-2120 Installation Guide
Table 3. Digital I/O LEDs
The port is either pulled high or driven high
The port is either pulled low or driven low
Using the Quadrature Encoder
Digital Port State
Consult your DAQ device specifications.
configuration)
2-prong miniature or subminiature connector
section for more