National Instruments PCI-8254R User Manual page 31

Chapter 3 Signal Connections
Figure 3-2 illustrates the 44-pin D-SUB connector on the NI 8254R.
Table 3-3 lists pin numbers, signal names, and signal descriptions for the
44-pin D-SUB connector on the NI 8254R and the 37-pin terminal block.
Caution Do not draw more than 500 mA combined from the V pins on the 44-pin D-SUB
connector. Do not draw more than 100 mA from 24 V or 30 V isolated outputs. Do not draw
more than 50 mA from 5 V isolated outputs.
44-Pin D-SUB
on NI 8254R 37-Pin Terminal
Pin Number Block Number
1
2
3
4
NI PCI-8254R User Manual
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Figure 3-2. NI 8254R 44-Pin D-SUB Connector
Table 3-3. Signal Connections
Signal Name
1 TTL Input 0
3 C
4 TTL Output 0
5 TTL Output 1
3-4
44 30 15
31 16 1
Primary Alternate
Function Function
Pulse generator Trigger Change
trigger input Detector,
General-purpose
input
Common-mode
signal of the
NI 8254R main
power
Watchdog timer General-purpose
output output
Pulse generator General-purpose
output output
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