National Instruments 321645c-01 用户手册

Chapter 2

Function Reference — Config_Alarm_Deadband

NI-DAQ FRM for PC Compatibles

2-66

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 National Instruments Corporation

Figure 2-2.  Low Alarm Deadband

Config_Alarm_Deadband

 is a high-level function for NI-DAQ event messaging. Because 

this function uses the current inputRange and polarity settings to translate triglevel and 
deadbandWidth from volts to binary, you should not call 

AI_Configure

 and change these 

settings after you have called 

Config_Alarm_Deadband

. For more information on NI-DAQ 

event messaging, see the low-level function 

Config_DAQ_Event_Message

. When you are 

using this function, the analog input data acquisition must be run with interrupts only 
(programmed I/O mode). You cannot use DMA. See 

Set_DAQ_Device_Info

 for how to 

change modes.

On:  low alarm on
Off:  low alarm off

on

off

Time