BNC-2120 Installation Guide
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© National Instruments
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13
Connecting User-Defined Signals
The USER 1 and USER 2 BNC connectors allow you to use a BNC connector for a digital I/O
or timing I/O signal of your choice. The USER 1 and USER 2 BNC connectors are routed
(internal to the BNC-2120) to the USER 1 and USER 2 screw terminals, as shown in Figure 5.
Figure 5.
USER <1..2> BNC Connections
Figure 6 shows an example of how to use the USER 1 and USER 2 BNCs. To access the
PFI 8/P2.0 (CTR 0 SOURCE) signal from a BNC, connect USER 1 on the screw terminal block
to PFI 8/P2.0 with a 28–16 AWG wire.
Figure 6.
Connecting PFI 8 to USER 1 BNC
The designated space next to each USER <1..2> BNC is for marking or labeling signal names.
U
S
ER 2 BNC
Intern
a
l
Connection
U
S
ER 1 BNC
D GND
U
S
ER 2
U
S
ER 1
D GND
Intern
a
l
Connection
BNC C
ab
le
PFI
8
S
ign
a
l
TIMING I/O
S
crew Termin
a
l Block
PFI
8
/P2.0
PFI 9/P2.1
PFI 12/P2.4
PFI 1
3
/P2.5
PFI 14/P2.6
+5 V
D GND
Wire
U
S
ER 1 BNC
D GND
U
S
ER 1
Intern
a
l
Connection
