Chapter 4 Hardware Overview
NI 5102 User Manual 4-10 ni.com
Table 4-5 describes the posttrigger acquisition signals.
Table 4-5. Posttrigger Acquisition Signals
Signal Description
Start Trigger Triggers the acquisition. It can be generated through software, or CH0,
CH1, TRIG, PFI1, and PFI2, or any of the seven RTSI bus trigger lines.
RTSI bus trigger lines are available only on the NI 5102 (PCI, PXI, ISA).
Scan Clock Causes the ADC to convert the input signal into digital data. This signal is
also used in the memory controller to write the data into onboard memory.
This signal can be generated internally, with a 24-bit counter clocked with
a 20 MHz signal to generate pulses from 20 MHz to 1.19 Hz. The 24-bit
counter provides a wide choice of valid frequencies for the Scan Clock
signal. In addition, Scan Clock can alsobe selected from CH0, CH1, TRIG,
PFI1, and PFI2, or any of the seven RTSI bus trigger lines. RTSI bus trigger
lines are available only on the NI 5102 (PCI, PXI, ISA).
End of Acquisition Indicates end of acquisition to the control logic in the hardware. It is
generated froma counter thatkeeps trackof thenumber of points remaining
in the acquisition. It can be exported from the device on the PFI lines.
