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Appendix C
Common Questions
C-2
ni.com
If the SCXI-1521/B module is not cabled directly to a E/M Series DAQ
device, can I measure conditioned signals for channels 0 through 7 at
the rear connector, for example—using a scope, DMM, or custom
acquisition system?
NI does not support or recommend this usage.
Can I use the unused analog input channels of the E/M Series DAQ
device if I am directly cabled to the SCXI-1521/B—for example, with
the SCXI-1180 feedthrough?
No. E/M Series DAQ device channels 1 through 7 connect to the
conditioned analog outputs of SCXI-1521/B channels 1 through 7.
Can I configure the SCXI-1521/B for use in parallel mode?
No. The SCXI-1521/B does not support parallel mode.
Which digital lines are unavailable on the E/M Series DAQ device if I
am cabled to an SCXI-1521/B module?
Table C-1 shows the digital lines that are used by the SCXI-1521/B for
communication and scanning. These lines are unavailable for
general-purpose digital I/O if the SCXI-1521/B is connected to the
E/M Series DAQ device.
Table C-1.
Digital Signals on the SCXI-1521/B
E/M Series
DAQ Device
Signal Name
NI-DAQmx
SCXI Signal Name
50-Pin
Connector
68-Pin
Connector
Direction
1
DIO 0
P0.0
25
52
Output
DIO 4
P0.4
26
19
Input
DIO 1
P0.1
27
17
Output
DIO 2
P0.2
29
49
Output
SCAN CLK
AI HOLD COMP,
AI HOLD
36
46
Output