Chapter 4
Signal Connections
PCI-4451/4452/4453/4454 User Manual
4-8
www.ni.com
Digital I/O Connector Signal Descriptions
♦
PCI-4451/4452
Figure 4-3 shows the digital pin connections for the PCI-4451/4452.
Figure 4-3.
Digital Pin Connections
Refer to Appendix B,
, for the digital pin connections of
the 68-pin connector.
NC
NC
NC
NC
NC
NC
NC
+5 V
+5 V
+5 V
DIO3
DIO4
DIO2
DIO0
DIO6
DIO7
CONVERT*
PFI1/TRIG2 (PRETRIG)
PFI3/GPCTR1_SOURCE
GPCTR1_OUT
PFI7
PFI6/WFTRIG
PFI8/GPCTR0_SOURCE
GPCTR0_OUT
FREQ_OUT
DGND
DGND
NC
NC
DGND
+5 V
NC
NC
DGND
DIO5
DGND
EXTSTROBE*
DGND
DIO1
DGND
RESERVED1
DGND
PFI0/TRIG1(EXT_TRIG)
DGND
PFI4/GPCTR1_GATE
DGND
UPDATE*
DGND
PFI9/GPCTR0_GATE
DGND
25 50
24 49
23 48
22 47
21 46
20 45
19 44
18 43
17 42
16 41
15 40
14 39
13 38
12 37
11 36
10 35
9
34
8
33
7
32
6
31
5
30
4
29
3
28
2
27
1
26