Chapter 4 Hardware Overview

PFI1

AUX

C

H 0

C

H 1

T

R

I

G

NI 5102

Figure 4-6. NI 5102 (PXI) I/O Connectors

Signal Connections

You can use CH0 and CH1 to digitize data as well as to trigger an acquisition. Use the TRIG channel for an external analog trigger only; data on the TRIG channel cannot be digitized. PFI1 and PFI2 are digital signals that you can use for timing-critical applications. When used as inputs, PFI lines can trigger an acquisition and/or allow an external scan clock connection. When used as outputs, PFI lines can output Start

Trigger, Stop Trigger, Scan Clock, and End of Acquisition signals as well as Analog Trigger Circuit Output, frequency output, and TTL low and high voltage information. Signal names and descriptions vary depending on the acquisition mode you are using. See the Acquisition Modes section later in this chapter for more information on timing and triggering.