National Instruments NI PXI-6541, Getting Started Manual, Page: 28 / 40

NI Digital Waveform Generator/Analyzer Getting Started Guide | © National Instruments | 27
NI 6555/6556 Front Panels and Connectors
The NI 6555/6556 front panels contain six connectors—three SMA connectors named CLK IN,
PFI 0, and CLK OUT, two 68-pin VHDCI connectors named DIGITAL DATA & CONTROL
(DDC) and REMOTE SENSE, and a COMBICON connector named AUX I/O.
Note
The NI 6555 does not have the AUX I/O connector.
Figure 16 shows the pinouts of the NI 6556 VHDCI connectors, which are identical to the
pinouts of the NI 6555 VHDCI connectors. The DDC signals are described in Table 3. The
REMOTE SENSE signals are described in Table 4. The NI 6556 AUX I/O signals are described
in Table 5. The SMA connectors are described in Table 7. The LEDs are described in
Tables 8 and 9.
Figure 16. NI 655 6 Front Panel Connectors
3 5
3 6
3 7
38
3
9
40
41
42
4
3
44
45
46
47
4
8
49
50
51
52
5
3
54
55
56
57
5
8
59
60
61
62
6
3
64
65
66
67
6
8
1
2
3
4
5
6
7
8
9
10
11
12
1
3
14
15
16
17
1
8
19
20
21
22
2
3
24
25
26
27
2
8
29
3 0
3 1
3 2
33
3
4
PFI 3 1
GND
PFI 29
GND
PFI 27
GND
PFI 25
GND
DIO 2 3
GND
DIO 21
GND
DIO 19
GND
DIO 17
GND
DIO 15
GND
DIO 1 3
GND
DIO 11
GND
DIO 9
GND
DIO 7
PFI 1
DIO 5
GND
DIO 3
PFI 3
DIO 1
GND
PFI 4 / DDC CLK OUT
GND
PFI 3 0
GND
PFI 2
8
GND
PFI 26
GND
PFI 24
GND
DIO 22
GND
DIO 20
GND
DIO 1
8
GND
DIO 16
GND
DIO 14
GND
DIO 12
GND
DIO 10
GND
DIO
8
GND
DIO 6
RE
S ERV
DIO 4
GND
DIO 2
PFI 2
DIO 0
GND
PFI 5 /
S
GND
GND
FI 5 S EN S E
GND
O 0 S EN S E
FI 2 S EN S E
O 2 S EN S E
GND
O 4 S EN S E
CAL GND
O 6 S EN S E
GND
O 8 S EN S E
GND
O 10 S EN S E
GND
O 12 S EN S E
GND
O 14 S EN S E
GND
O 16 S EN S E
GND
O 1 8 S EN S E
GND
O 20 S EN S E
GND
O 22 S EN S E
GND
NC
GND
NC
GND
NAL FORCE
GND
NAL S EN S E
GND
PFI 4
S EN S E
GND
DIO 1
S EN S E
NC
DIO
3 S EN S E
GND
DIO 5
S EN S E
PFI 1 S EN S E
DIO 7 S EN S E
GND
DIO 9
S EN S E
GND
DIO 11
S EN S E
GND
DIO 1
3 S EN S E
GND
DIO 15
S EN S E
GND
DIO 17
S EN S E
GND
DIO 19
S EN S E
GND
DIO 21
S EN S E
GND
DIO 2
3 S EN S E
GND
NC
GND
NC
GND
NC
GND
CAL DMM
EXT
FORCE
GUARD
EXT
SENSE
GUARD
–3 to 8.5V
MAX to
CAL
ACCESS ACTIVE
NI PXIe-6556
200 MHz Digital I/O with PPMU
PFI 0
CLK
IN
CLK
OUT
REMO
TE SENSE
DIGIT
A
L D
A
T
A
& CON
T
ROL
3 4
33
3
2
3 1
3 0
29
2
8
27
26
25
24
2
3
22
21
20
19
1
8
17
16
15
14
1
3
12
11
10
9
8
7
6
5
4
3
2
1
6 8
67
66
65
64
6
3
62
61
60
59
5
8
57
56
55
54
5
3
52
51
50
49
4
8
47
46
45
44
4
3
42
41
40
3 9
38
3
7
3 6
3 5
AUX I/O