Chapter 2 Digital I/O
NI PCI-8254R User Manual 2-4 ni.com
Table2-2 summarizes the isolated inputs and outputs available on the
NI8 254R.
I/O for Normal Operation
The following sections describe I/O functions that are available on the
NI 8254R during normal operation.
Table 2-2. NI 8254R Isolated Inputs and Outputs
Primary
Function Input or
Output Number
Available Signal
Names
44-Pin
D-SUB on
NI 8255R
Device Pin
Number
37-Pin
Terminal
Block
Number
Trigger Input 3TRIG 0*
ISO Input 5†
ISO Input 8*
11
35
40
—
15
27
Quadrature
Encoder Input 1ISO Input 6
ISO Input 7 37
38 25
26
External
Shutdown
Control
Input 1ISO Input 11 44 31
Product
Selection
Port†
Input 1ISO Input 0
ISO Input 1
ISO Input 2
ISO Input 3
ISO Input 4
15
30
31
32
34
9
10
11
13
14
General
Purpose Input 2ISO Input 9*
ISO Input 10*41
43 29
30
General
Purpose Output 4ISO Output 0
ISO Output 1
ISO Output 2
ISO Output 3
12
13
27
28
198
35
36
37
* TRIG 0, ISO Input 8, ISO Input 9, and ISO Input 10 can also function as trigger change detectors.
† ISO Input 5 can also function as a latch for the product selection port.