NI Digital Waveform Generator/Analyzer Guide
22
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Figure 12 shows the NI 6551
front panels and pinout, which are identical to
those of the NI 6552. The DDC signals are described in Table 2. The SMB
connectors are described in Table 4. The LEDs are described in
Tables 5 and 6.
1, 3, 5, 7, 9, 11,
13, 15, 17, 19,
21, 23, 25, 27,
29, 31, 35, 37,
39, 41, 43, 45,
47, 49, 51, 53,
55, 57, 59, 61,
63, 65
DIO <0..31>
Data
Bidirectional digital I/O data
channels 0 through 31.
26, 30, 64
PFI <1..3>
Control
Input terminals to the NI 654
x
for external triggers, or output
terminals from the NI 654
x
for
events.
2, 4, 6, 10, 12,
14, 16, 18, 20,
22, 24, 28, 32,
34, 36, 38, 40,
42, 44, 46, 48,
50, 54, 56, 58,
62, 66
GND
Ground
Ground reference for signals.
8, 52, 60
RESERVED
N/A
These terminals are reserved for
future use. Do not connect to
these pins.
Table 1.
NI 654
x
DDC Connector Pins (Continued)
Pins
Signal Name
Signal
Type
Signal Description