National Instruments ni 6115-6120 User Manual

PFI0/TRIG1

DGND

Input 

Output

PFI0/Trigger 1—As an input, this is either a PFI or the 
source for the hardware analog trigger. PFI signals are 
explained in the 

 section 

later in this chapter. The hardware analog trigger is 
explained in the 

 section of Chapter 3, 

. As an output, this is the TRIG1 

signal. In posttrigger DAQ sequences, a low-to-high 
transition indicates the initiation of the DAQ sequence. 
In pretrigger applications, a low-to-high transition 
indicates the initiation of the pretrigger conversions.

PFI1/TRIG2

DGND

Input 

Output

PFI1/Trigger 2—As an input, this is a PFI. As an 
output, this is the TRIG2 signal. In pretrigger 
applications, a low-to-high transition indicates the 
initiation of the posttrigger conversions. TRIG2 is not 
used in posttrigger applications.

PFI2/CONVERT*

DGND

Input 

Output

PFI2/Convert—As an input, this is a PFI. As an output, 
this is the CONVERT* signal. A high-to-low edge on 
CONVERT* indicates that an A/D conversion is 
occurring.

PFI3/GPCTR1_SOURCE 

DGND

Input 

Output

PFI3/Counter 1 Source—As an input, this is a PFI. As 
an output, this is the GPCTR1_SOURCE signal. This 
signal reflects the actual source connected to the 
general-purpose counter 1.

PFI4/GPCTR1_GATE

DGND

Input 

Output

PFI4/Counter 1 Gate—As an input, this is a PFI. As an 
output, this is the GPCTR1_GATE signal. This signal 
reflects the actual gate signal connected to the 
general-purpose counter 1.

GPCTR1_OUT

DGND

Output

Counter 1 Output—This output is from the 
general-purpose counter 1 output.

PFI5/UPDATE*

DGND

Input 

Output

PFI5/Update—As an input, this is a PFI. As an output, 
this is the UPDATE* signal. A high-to-low edge on 
UPDATE* indicates that the AO primary group is being 
updated.

PFI6/WFTRIG

DGND

Input 

Output

PFI6/Waveform Trigger—As an input, this is a PFI. 
As an output, this is the WFTRIG signal. In timed 
AO sequences, a low-to-high transition indicates the 
initiation of the waveform generation.

PFI7/STARTSCAN

DGND

Input 

Output

PFI7/Start of Scan—As an input, this is a PFI. As an 
output, this is the STARTSCAN signal. This pin pulses 
once at the start of each AI scan in the interval scan. 
A low-to-high transition indicates the start of the scan.

Table 4-2.  Signal Descriptions for I/O Connector Pins (Continued)