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4.3 - ECount [U12 Datasheet]

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).


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

Parameter Description:
Returns: LabJack errorcodes or 0 for no error.

  • *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.


  • *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

- python

import u12
d = u12.U12()
#{'count': 3138388207, 'idnum': 12, 'ms': 1273175001372.4438}
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