National Instruments 321645c-01 用户手册
Chapter 2
Function Reference — Config_Alarm_Deadband
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National Instruments Corporation
2-63
NI-DAQ FRM for PC Compatibles
Config_Alarm_Deadband
Format
status = Config_Alarm_Deadband (deviceNumber, mode, chanStr, trigLevel, deadbandWidth,
handle, alarmOnMessage, alarmOffMessage,
callbackAddr)
callbackAddr)
Purpose
Notifies NI-DAQ applications when analog input signals meet the alarm-on or alarm-off
condition you specified. Also, NI-DAQ sends your application a message or executes a
callback function that you provide.
condition you specified. Also, NI-DAQ sends your application a message or executes a
callback function that you provide.
Parameters
Input
Parameter Discussion
mode indicates whether to add a new alarm message or remove an old alarm message with
the given device.
the given device.
0:
Add a high alarm deadband event.
1:
Add a low alarm deadband event.
2:
Remove a high alarm deadband event.
3:
Remove a low alarm deadband event.
chanStr is a string description of the trigger analog channel or digital port.
Name
Type
Description
deviceNumber
i16
assigned by configuration utility
mode
i16
add or remove high/low alarm events
chanStr
STR
channel string
trigLevel
f64
trigger level in volts
deadbandWidth
f64
the width of the alarm deadband in volts
handle
i16
handle
alarmOnMessage
i16
user-defined alarm-on message
alarmOffMessage
i16
user-defined alarm-off message
callbackAddr
u32
user callback function address