28 | ni.com | NI Digital Waveform Generator/Analyzer Getting Started Guide
Table 3. NI 6555/6556 DDC Connector Pins
Pins Signal Name
Signal
Type
Signal Description
9, 11, 13, 15, 17,
19, 21, 23, 25,
27, 29, 31, 43,
45, 47, 49, 51,
53, 55, 57, 59,
61, 63, 65
DIO <0..23> Data Bidirectional PPMU-capable
digital I/O data channels 0
through 23.
26, 64 PFI <1..2> Control PPMU-capable input terminals to
the NI 6555/6556 for external
triggers, or output terminals from
the NI 6555/6556 for events.
1, 3, 5, 7, 30, 35,
37, 39, 41
PFI 3,
PFI <24..31>
Control Single-ended input terminals to the
NI 6555/6556 for external triggers,
or output terminals from the
NI 6555/6556 for events. Refer to
the NI 6555/6556 Specifications for
signal voltage levels.
33 PFI 4 /
DDC CLK OUT
Control Bidirectional PPMU-capable
terminal for an exported Sample
clock or for trigger and event
routing.
67 PFI 5 / STROBE Control Bidirectional PPMU-capable
terminal for external Sample clock
source that can be used only for
dynamic acquisition or for trigger
and event routing.
2, 4, 6, 8, 10, 12,
14, 16, 18, 20,
22, 24, 28, 32,
34, 36, 38, 40,
42, 44, 46, 48,
50, 52, 54, 56,
58, 62, 66, 68
GND Ground Ground reference for signals.
60 RESERVED N/A These terminals are reserved for
future use. Do not connect to these
pins.
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