User's Manual

Chapter 2 Function Reference — Config_Alarm_Deadband
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
on
off
Time