National Instruments SCXI -1125 用户手册

NI strongly recommends monitoring the built-in error status of each NI-DAQ 

function. The NI-DAQ C API provides the 

NIDAQErrorHandler

 function, which ensures 

that a specified NI-DAQ function executed properly, and assists in handling error messages 
and reporting.

After configuring the hardware for acquisition, you must load the various 
channel attributes such as filter, gain, and excitation appropriate for your 
application explicitly using the NI-DAQ function calls shown in Table 5-8. 
For more information regarding each setting, refer to the Traditional 
NI-DAQ (Legacy) Function Reference Help installed by default in 
Start»Programs»National Instruments»NI-DAQ.

Table 5-7.  Configuration Functions 

SCXI_Reset

Resets the hardware such as the specified module to its default state. 
You also can use 

SCXI_Reset

 to reset the SCXI chassis Slot 0 scanning 

circuitry or reset the entire chassis.

The SCXI-1125 default conditions are:

•

Gain set at 1000.0

•

4 Hz lowpass filter

SCXI_Load_Config

Loads the SCXI chassis configuration information you established in 
MAX. Sets the software states of the chassis and the modules present to 
their default states. This function makes no changes to the hardware 
state of the SCXI chassis or modules. It is possible to programmatically 
change the configuration you established in MAX using the 

SCXI_Set_Config

 function.

SCXI_SCAN_Setup

Initializes multiplexing circuitry for a scanned data acquisition 
operation. Initialization includes storing a table of the channel sequence 
and gain setting for each channel to be digitized (MIO and AI devices 
only). You cannot repeat channels or use nonsequential channels when 
using the 

SCXI_SCAN_Setup

 function.

SCXI_MuxCtr_Setup

Programs the E Series DAQ device with the correct number of channels 
multiplexed per scan. This number must match the total number of 
channels programmed in 

SCXI_SCAN_Setup

.