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App Notes

Software & Driver

 

4.3 - ECount

Easy function. This is a simplified version of Counter. Reads & resets the counter (CNT). Calling this function disables STB (which is the default anyway).

Execution time for this function is 20 milliseconds or less (typically 16 milliseconds in Windows).

Declaration:


long ECount (    long *idnum,
                 long demo,
                 long resetCounter,
                 double *count,
                 double *ms )

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.
  • resetCounter – If >0, the counter is reset to zero after being read.

Outputs:

  • *idnum – Returns the local ID or –1 if no LabJack is found.
  • *count – Current count, before reset.
  • *ms – Value of Window’s millisecond timer at the time of the counter read (within a few ms). Note that the millisecond timer rolls over about every 50 days. In general, the millisecond timer starts counting from zero whenever the computer reboots.

LabJackPython Example

  
>>> import u12
>>> d = u12.U12()
>>> d.eCount(resetCounter=0)
{'count': 3138388207, 'idnum': 12, 'ms': 1273175001372.4438}