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Chapter 3 Signal Connections
NI PCI-8254R User Manual 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 8254R 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 8254R 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 8254R 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 8254R
Pin Number
37-Pin Terminal
Block Number
Signal Name
Primary
Function
Alternate
Function