©
National Instruments Corporation
3
BNC-2121 Connector Accessory for 660X Devices
Figure 2.
BNC-2121 Front Panel
1
Warning Label
2
PFI Line Spring Terminal
3
Quadrature Encoder Output
Spring Terminals
4
Digital Trigger Output Spring
Terminal
5
Frequency Output Spring
Terminal
(
)
6
+5 V Output Spring Terminal
7
GND Terminal
8
Quadrature Encoder Knob
9
Digital Trigger Button
10 Digital Trigger Filtering Switch
11 68-Position I/O Connector
12 Power LED Indicator
13 Digital Line LED State Indicator
14 BNC Connectors for
Counters 0 and 1
15 User-Defined BNC Connector
16 Spring Terminals for
User-Defined BNC Connectors
17 Frequency Selection Switch
18 Frequency Adjust Knob
19 Digital Trigger Line
LED State Indicator
!
PFI
21
23
25
27
29
31
33
35
37
39
DIGITAL I/O INDICATORS
P0.0
P0.2
P0.4
P0.6
P0.1
P0.3
P0.5
P0.7
P0.1
P0.3
GND
P0.5
P0.7
GND
SRC7
GND
UP/DN6
SRC6
GND
UP/DN5
SRC5
GND
UP/DN7
P0.0
P0.2
GND
P0.4
P0.6
GND
OUT7
GATE7
GND
OUT6
GATE6
GND
OUT5
GATE5
GND
PFI
0
2
4
6
8
10
12
14
16
18
OUT4
GATE4
GND
OUT3
GATE3
GND
OUT2
GATE2
GND
OUT1
GATE1
GND
OUT0
GATE0
RESERVE1
UP/DN4
SRC4
GND
UP/DN3
SRC3
GND
UP/DN2
SRC2
GND
UP/DN1
SRC1
GND
UP/DN0
SRC0
RESERVE2
PFI
20
22
24
26
28
30
32
34
36
38
PFI LINES 0-39
PWR
PFI LINES 32-39
USER DEFINED FUNCTIONS
OUT1
PFI 32
UP/DN1
PFI 33
SRC1
PFI 35
GATE1
PFI 34
OUT0
PFI 36
UP/DN0
PFI 37
SRC0
PFI 39
GATE0
PFI 38
10 Hz-200 Hz
150 Hz-20 kHz
14 kHz-1 MHz
Frequency
Selection
Frequency
Adjust
LO
HI
( )
( )
USER 1
USER 2
USER 4
USER 3
USER 5
USER 6
Filtering
OFF
ON
Digital Trigger (TRIGGER)
Quadrature Encoder
24 Pulses/rev (A,B)
ENCODER A
ENCODER B
TRIGGER
+5V
GND
USER 1
USER 2
USER 3
USER 4
USER 5
USER 6
Drive only one signal per PFI line
using either a BNC, a spring
terminal or the 660X device.
!
Electrostatic
Sensitive
Connectors
BNC-2121
PFI
1
3
5
7
9
11
13
15
17
19
16
14
15
2
13
3
4
5
6
7
12
9
19
18
1
11
8
17
10
