LabJack U12, Руководство пользователя, Страница: 26 / 36

4.5 AIStreamClear
This function stops the continuous acquisition. It should be called once when finished with the
stream. The sequence of calls for a typical stream operation is: AIStreamStart, AIStreamRead,
AIStreamRead, AIStreamRead, …, AIStreamClear.
Declaration:
long __cdecl AIStreamClear ( long localID )
Parameter Description:
Returns:
LabJack errorcodes or 0 for no error.
Input:
•
localID – Send the local ID from AIStreamStart/Read.
4.6 AOUpdate
Sets the voltages of the analog outputs. Also controls/reads all 20 digital I/O and the counter.
Execution time for this function is 20 milliseconds or less.
Declaration:
long __cdecl AOUpdate (
long *idnum,
long demo,
long trisD,
long trisIO,
long *stateD,
long *stateIO,
long updateDigital,
long resetCounter,
unsigned long *count,
float analogOut0,
float analogOut1)
Parameter Description:
Returns:
LabJack errorcodes or 0 for no error.
Inputs:
•
*idnum – Local ID, serial number, or -1 for first found.
•
demo – Send 0 for normal operation, >0 for demo mode. Demo mode allows
this function to be called without a LabJack.
•
trisD – Directions for D0-D15. 0=Input, 1=Output.
•
trisIO – Directions for IO0-IO3. 0=Input, 1=Output.
•
*stateD – Output states for D0-D15.
•
*stateIO – Output states for IO0-IO3.
• updateDigital – If >0, tris and state values will be written. Otherwise, just a read
is performed.
• resetCounter – If >0, the counter is reset to zero after being read.
• analogOut0 – Voltage from 0.0 to 5.0 for AO0.
•
analogOut1 – Voltage from 0.0 to 5.0 for AO1.
Outputs:
•
*idnum – Returns the local ID or –1 if no LabJack is found.
•
*stateD – States of D0-D15.
•
*stateIO – States of IO0-IO3.
•
*count – Current value of the 32-bit counter (CNT). This value is read before the
counter is reset.