National Instruments GPIB-PC - Manual (Page 61)

GPIB-PC Functions — Introduction Section Three
GPIB-PC User Manual 3-18 ©National Instruments Corp.
IBEOS (bd,v)
IBEOS assigns the end of string (EOS) character to use with subsequent
IBRD and IBWRT operations. This character is compared with incoming
bytes from the device and may be used to terminate a read operation. It
is also compared with outgoing bytes to the device and may be used to
generate the END message (EOI).
IBBNA (bd,"GPIBn")
IBBNA assigns board n to be the access board for device bd .
IBDMA (bd,v)
IBDMA selects DMA or programmed I/O for the board. This function is
only appropriate for boards with DMA capability.
IBPAD (bd,v)
IBPAD sets the primary GPIB address of the device or board.
IBSAD (bd,v)
IBSAD sets the board's or device's secondary GPIB address or disables
secondary addressing.
IBRSC (bd,v)
IBRSC causes the board to request or release System Control authority.
IBTMO (bd,v)
IBTMO sets the time limit in which operations with a device or board
must complete.
Another important feature of the GPIB-PC functions is that they return
status information about the boards and devices in the system. This
information is returned in the form of three global status variables,
IBSTA , IBERR , and IBCNT . The beginning of Section Four fully
describes these variables.