IBWAIT
Board-Level/Device-Level
Purpose
Wait for GPIB events.
Format
C
unsigned long ibwait (int ud, int mask)
Visual Basic
CALL ibwait (ud%, mask%)
or
status% = ilwait (ud%, mask%)
Interactive Control (Usage Notes)
ibwait mask
Input
| ud | Board or device descriptor |
| mask | Bit mask of GPIB events to wait for |
Output
| Function Return | The value of Ibsta |
Description
ibwait monitors the events specified by mask and delays processing until one or more of the events occurs. If the wait mask is zero, ibwait returns immediately with the updated Ibsta status word. If TIMO is set in the wait mask, ibwait returns when the timeout period has elapsed, if one or more of the other specified events have not already occurred. If TIMO is not set in the wait mask, the function waits indefinitely for one or more of the specified events to occur. The existing ibwait mask bits are identical to the Ibsta bits. If ud is a device descriptor, the only valid wait mask bits are TIMO, END, RQS, and CMPL. If ud is a board descriptor, all wait mask bits are valid except for RQS. You can configure the timeout period using the ibconfig function (option IbcTMO).
Possible Errors
| EARG | The bit set in mask is invalid. |
| EBUS | Device-level: No devices are connected to the GPIB. |
| ECIC | Device-level: The access board is not CIC. See Device-Level Calls and Bus Management. |
| EDVR | The NI-488.2 driver is either configured incorrectly or is not properly installed. |
| EHDL | ud is invalid or out of range. |
| ELCK | The requested operation could not be performed because of an existing lock by another process. |
| ENEB | The interface is not installed or is not properly configured. |
| ESRQ | Device-level: If RQS is set in the wait mask, ESRQ indicates that the Stuck SRQ condition exists. For more information about serial polling, refer to the Serial Polling Overview. |
| EWIP | An ibwait call is already in progress on the specified unit descriptor. |
| ERST | The event notification was cancelled due to a reset of the interface. |