Figure 4-25. Startscan Input Signal Timing; Figure 4-26. Startscan Output Signal Timing - National Instruments DAQ PCI-6023E User Manual

Rising-edge
polarity
Falling-edge
polarity
STARTSCAN
Start Pulse
CONVERT*
STARTSCAN
© National Instruments Corporation
STARTSCAN will be deasserted t
initiated. This output is set to tri-state at startup.
Figures 4-25 and 4-26 show the input and output timing requirements for
the STARTSCAN signal.

Figure 4-25. STARTSCAN Input Signal Timing

a. Start of Scan
t = 10 ns minimum
off
b. Scan in Progress, Two Conversions per Scan

Figure 4-26. STARTSCAN Output Signal Timing

The CONVERT* pulses are masked off until the board generates the
STARTSCAN signal. If you are using internally generated conversions, the
first CONVERT* appears when the onboard sample interval counter
reaches zero. If you select an external CONVERT*, the first external pulse
after STARTSCAN generates a conversion. The STARTSCAN pulses
should be separated by at least one scan period.
after the last conversion in the scan is
off
t
w
t
= 10 ns minimum
w
t
w
t = 50-100 ns
w
4-37
Chapter 4 Signal Connections
t off
PCI-6023E/6024E/6025E User Manual