National Instruments SCXI -1125 用户手册

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This appendix is not applicable if you use the virtual channels to configure and 

measure the SCXI channels. Virtual channels are configured using MAX. If you use virtual 
channels, you address the SCXI channels by specifying the channel name(s) in the channel 
string input.

When using LabVIEW, and Visual Basic, the SCXI channel string 
determines which SCXI channels are scanned and the scanning sequence. 
The SCXI channel string allows you to take measurements from several 
channels on one module with only one channel string entry. An array of 
these channel string entries configures multiple modules for scanning. 
When the application program runs, the channel string is used 
for programming the channel information into the SCXI system.

The format of the channel string is as follows:

ob

x ! scy ! mdz ! channels

where

•

ob

x

 is the onboard E/M Series DAQ device channel, with 

x

representing a particular channel where the multiplexed channels are 
sent. This value is 0 for E/M Series DAQ device channel 0 in a 
single-chassis system. In a multichassis or remote chassis system, the 
E/M Series DAQ device channel 

x

 corresponds to chassis number 

n 

– 1, where E/M Series DAQ device channel 

x

 is used for scanning 

the nth chassis in the system.

•

sc

y

 is the SCXI chassis ID, where 

y

 is the number you chose when 

configuring the chassis.

•

md

z

 is the slot position where the module is located, with 

z

 being the 

particular slot number. The slots in a chassis are numbered from left to 
right starting with 1.