NI Digital Waveform Generator/Analyzer Guide 22 ni.com
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 654x
for external triggers, or output
terminals from the NI 654x 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 654x DDC Connector Pins (Continued)
Pins Signal Name
Signal
Type
Signal Description
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