IBWRT
Board-Level/Device-Level
Purpose
Write data to a device from a user buffer.
Format
C
unsigned long ibwrt (int ud, const void *wrtbuf, size_t count)
Visual Basic
CALL ibwrt (ud%, wrtbuf$)
or
status% = ilwrt (ud%, wrtbuf$, count&)
Interactive Control (Usage Notes)
ibwrt wrtbuf
Input
| ud | Board or device descriptor |
| wrtbuf | Address of the buffer containing the bytes to write |
| count | Number of bytes to be written |
Output
| Function Return | The value of Ibsta |
Description
Device-Level
If ud is a device descriptor, ibwrt addresses the GPIB and writes count bytes from the memory location specified by wrtbuf to a GPIB device. The operation terminates normally when count bytes have been sent. The operation terminates with an error if count bytes could not be sent within the timeout period. The actual number of bytes transferred is returned in the global function Ibcnt.
Board-Level
If ud is a board descriptor, ibwrt writes count bytes of data from the buffer specified by wrtbuf to a GPIB device; a board-level ibwrt assumes that the GPIB is already properly addressed. The operation terminates normally when count bytes have been sent. The operation terminates with an error if count bytes could not be sent within the timeout period or, if the board is not CIC, the CIC sends Device Clear on the GPIB. The actual number of bytes transferred is returned in the global function Ibcnt.
Possible Errors
| EABO | Either count bytes were not sent within the timeout period, or a Device Clear message was received after the write operation began. |
| EADR | Board-level: The GPIB is not correctly addressed; use ibcmd to address the GPIB. |
| Device-level: A conflict exists between the device GPIB address and the GPIB address of the device access board. Use the IbcPAD and IbcSAD options in ibconfig. | |
| EARG | Either the buffer or the count 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. |
| ENOL | No Listeners were detected on the bus. |
| EOIP | Asynchronous I/O is in progress. |