© National Instruments Corporation 21 NI Digital Waveform Generator/Analyzer Guide
Figure 9 shows the NI6551 front panels and pinout, which are identical to those of the NI 6552. The DDC signals are described in Table5. The SMB connectors are described in Table7. The LEDs are described in Tables8 and 9.Figure 9. NI 655X Front Panel Connectors
NI PXI-6551
50 MHz Digital I/O
DIGITAL DATA & CONTROL
PFI 0
ACCESS ACTIVE
CLK
IN
CLK
OUT
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
RESERVED
GND
RESERVED
GND
RESERVED
GND
RESERVED
RESERVED
RESERVED
GND
RESERVED
GND
DIO 19
GND
DIO 17
GND
DIO 15
GND
DIO 13
GND
DIO 11
GND
DIO 9
GND
DIO 7
PFI 1
DIO 5
GND
DIO 3
PFI 3
DIO 1
GND
DDC CLK OUT
GND
RESERVED
GND
RESERVED
GND
RESERVED
GND
RESERVED
GND
RESERVED
GND
RESERVED
GND
DIO 18
GND
DIO 16
GND
DIO 14
RESERVED
DIO 12
GND
DIO 10
GND
DIO 8
GND
DIO 6
RESERVED
DIO 4
GND
DIO 2
PFI 2
DIO 0
GND
STROBE
GND
PFI
0
CLK
IN
CLK
OUT
NI PCI-6551
DIGITAL
DATA &
CONTROL
The Digital Data & Control connector pinout
is the same for PXI and PCI devices.