26 | ni.com | NI Digital Waveform Generator/Analyzer Getting Started Guide
Table 2. NI 6551/6552 DDC Connector Pins
Pins Signal Name
Signal
Type
Signal Description
33 DDC CLK OUT Control Output terminal for the exported
Sample clock.
67 STROBE Control Terminal for the external Sample
clock source, which can be used for
dynamic acquisition.
13, 15, 17, 19,
21, 23, 25, 27,
29, 31, 47, 49,
51, 53, 55, 57,
59, 61, 63, 65
DIO <0..19> Data Bidirectional digital I/O data
channels 0 through 19.
26, 30, 64 PFI <1..3> Control Input terminals to the
NI 6551/6552 for external triggers,
or output terminals from the
NI 6551/6552 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.
1, 3, 5, 7, 8, 9, 11,
35, 37, 39, 41,
43, 45, 52, 60
RESERVED N/A These terminals are reserved for
future use. Do not connect to these
pins.
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