Appendix B
Common Questions
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National Instruments Corporation
B-3
Which digital lines are unavailable on the DAQ device if it is directly
connected to an SCXI-1104/C module?
Table B-1 shows the digital lines that are used by the SCXI-1104/C for
communication and scanning. These lines are unavailable for general-
purpose digital I/O if the SCXI-1104/C is connected to the DAQ device.
Is there any way to change the cutoff frequency and gain of each
channel on an SCXI-1104/C module, either using software or by
modifying the circuitry of the module?
No. All channels share the same gain and cutoff frequency and you cannot
modify them.
Some SCXI modules, such as the SCXI-1112 and SCXI-1125, permit
random scanning. Does the SCXI-1104/C permit random scanning?
No. You must scan channels in consecutive ascending order and you cannot
repeat any channels.
Can I configure and use the SCXI-1104/C in parallel mode?
No. You can only use the SCXI-1104/C in multiplexed scanning mode.
Table B-1.
Digital Signals on the SCXI-1104/C
DAQ Signal
Name
SCXI Signal Name
50-Pin
Connector
68-Pin
Connector
Direction
DIO0
SERDATIN
25
52
Output
DIO4
SERDATOUT
26
19
Input
DIO1
DAQD*/A
27
17
Output
DIO2
SLOT0SEL*
29
49
Output
SCANCLK
SCANCLK
36
46
Output
EXTSROBE*
SERCLK
37
45
Output
STARTSCAN
SYNC*
46
38
Output
