National Instruments NI-488.2 - Manual (Page 115)

Appendix C Error Codes and Solutions
© National Instruments Corporation C-11 NI-488.2 User Manual
ERST (27)
ERST results when an event notification was cancelled due to a reset of the
interface.
An ibwait call pending in the driver returns ERST in the following
situations:
• Another thread in the same process calls ibonl using the same unit
descriptor as ibwait.
• Another thread or another process issues a board-level ibonl 1 .
An ibnotify Callback may be invoked with ERST in the following
situations:
• Another process issues a board-level ibonl 1 .
Solutions
Do not call ibonl with ibwait calls still pending in the driver.
Prevent other applications from calling ibonl by locking the interface
with iblck .
EPWR (28)
EPWR results when an interface loses power. This often results when the
system goes to and returns from a standby state.
Solutions
Take all handles offline and reinitialize the application.
Quit the application and restart.
Disable standby and hibernate modes on the PC.