National Instruments 321645c-01

Chapter 2 Function Reference — Config_Alarm_D eadband

NI-DAQ FRM for PC Compatibles 2-66

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.

trigLevel +

deadbandWidth/2

trigLevel -

deadbandWidth/2

trigLevel

On: low alarm on

Off: low alarm off

off

Time