질문이 좀..-_-;;;
ibwrt가 GPIB관련 명령이라면..
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IBWRT
Board-Level/Device-Level

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Purpose
Write data to a device from a user buffer.

Format
C
int ibwrt (int ud, void *wrtbuf, long 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