National Instruments SCXI -1125 Manuel D’Utilisation

channels

 is the list of channels that are scanned for module 

z

. It can have 

several formats:

•

ob

x ! scy ! mdz ! nx

, where 

nx

 is a single input channel.

•

ob

x ! scy ! mdz ! (n0, n2)

, where 

n0, n2

 are individual input 

channel that are not necessarily sequential.

•

ob

x ! scy ! mdz ! n0:n3

, where 

n0

 and 

n3

 represent an ascending 

sequential list of input channels, inclusive.

•

ob

x ! scy ! mdz ! (n0, n2, n3:n4, n1, n5, n2)

, where 

n0

, 

n2

, and 

n5

 represent single channels, not necessarily sequential, 

and 

n3

 and 

n4

 represent the endpoints of an ascending sequential list 

of channels, inclusive. In this case, channels 

n1

 and 

n2

 are explicitly 

repeated in the channel list.

Using parenthesis surrounding multiple channels in a channel string is important 

for correct scanning operation of the SCXI channels.

 

 
In a single-chassis system, the 

ob

x !

 

specifier is optional and causes the gains on the 

module and E/M Series DAQ device to be automatically set to fit the input limits 
parameter. When this specifier is omitted, the default gain on the E/M Series DAQ device, 
usually the lowest gain, is used, but the SCXI-1125 gain is adjusted to fit the input limits. 
NI recommends using the 

ob

x !

 specifier.

 

 
Repeating channels or having channels out of sequence in a scan list is not supported on 
all SCXI modules. Refer to the manual of each module for information on this feature, 
which is referred to as flexible scanning or random scanning.

For more information about using SCXI channel string, refer to the 
LabVIEW Measurements Manual and SCXI-1125 shipping examples.