Chapter 3 Signal Connections
DAQArb 5411 User Manual 3-6
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National Instruments Corporation
SHC50-68 50-Pin Cable Connector
You can use an optional SHC50-68 50-pin to 68-pin cable for pattern
generator output. The cable connects to the digital output connector on
the DAQArb 5411. Figure 3-5 shows the 68-pin connector pin
assignments on the SHC50-68 cable.
Table 3-1. Digital Output Connector Signal Descriptions
Signal Name Type Description
DGND – Digital ground
EXT_TRIG Input External trigger—The external trigger input signal is a
TTL-level signal that you can use to start or step through a
waveform generation. For more information on trigger sources
and trigger mode, see Chapter 4, Arb Operation.
MARKER Output Marker—A marker is a TTL-level output signal that you can set
up at any point in the waveform being generated. You can use
this signal to synchronize or trigger other devices at a certain
time within waveform generation.
NC – Not connected.
PA<0..15> Output Digital pattern generator—The 16-bit digital representation of
the analog waveform is available as digital pattern outputs
along with the clock to which it is synchronized. This data is
available directly from the memory after some sample clocks
pipeline delay. The digital pattern outputs are available as TTL
output levels.
PCLK Output Digital pattern clock—The digital pattern clock output
synchronizes the digital pattern output. This data is available
directly from the memory after some sample clocks pipeline
delay. The clock output is available as a TTL output level.
RFU – Reserved for future use. Do not connect signals to this pin.
+5V Output +5 V power—A +5 V output signal is av ailable on the DAQ Arb
to power external devices. The maximum current you can draw
is 100 mA.