National Instruments NI PCI-8254R User Manual
Page 32

Chapter 3
Signal Connections
3-6
ni.com
16
2
TTL Input 1
Pulse generator
trigger input
Trigger Change
Detector,
General-purpose
input
17
3
C
Common-mode
signal of the
NI 8255R device
main power
—
18
20
TTL Output 4
Pulse generator
output
General-purpose
output
19
21
TTL Output 5
General-purpose
output
—
20
22
C
Common-mode
signal of the
NI 8255R device
main power
—
21
23
TTL Output 6
General-purpose
output
—
22
24
TTL Output 7
General-purpose
output
—
23
22
C
Common-mode
signal of the
NI 8255R device
main power
—
24
NC
Trig 1
*
/TTL
Output 9
Pulse generator
output
General-purpose
output
25
33
V
iso
Isolated power
—
26
34
C
iso
Isolated
common-mode
signal
—
Table 3-3. Signal Connections (Continued)
44-Pin D-SUB
on NI 8255R
Device Pin
Number
37-Pin Terminal
Block Number
Signal Name
Primary
Function
Alternate
Function
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