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Chapter 5
NI-488M Software Characteristics and Functions
IBSAD (3)
IBSAD (3)
Purpose:
Change or disable Secondary Address.
Syntax:
int ibsad ( int ud, int v)
ud specifies a device or an interface board. If v is a number between
hex 60 and hex 7E, that number becomes the secondary GPIB address
device or interface board. If v is hex 7F or zero, secondary addressing is
disabled. ibsad is needed only to alter the secondary address value from
its configuration setting.
The assignment made by this function remains in effect until ibsad is
called again, the ibonl or ibfind function is called, or the system is
restarted.
When ibsad is called and an error does not occur, the previous secondary
address is stored in iberr.
Device IBSAD Function
If ud specifies a device, the function enables or disables extended GPIB
addressing for the device. When secondary addressing is enabled, the
specified secondary GPIB address of that device is sent automatically in
subsequent device I/O functions.
Board IBSAD Function
If ud specifies an interface board, the ibsad function enables or disables
extended GPIB addressing and, when enabled, assigns the secondary
address of the GPIB board.
Refer also to IBPAD and IBONL.
Device Function Example:
1.
Change the secondary GPIB address of plotter from its current
value to hex 6A.
ibsad (dvm, 0x6A);
© National Instruments Corp.
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NI-488.2M Reference Manual