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Chapter 3 Software Overview
© National Instruments Corporation 3-5 NI-VXI User Manual
SetDevInfoShort (la, field, shortvalue)
SetDevInfoShort
changes information about the specified device in
the NI-VXI RM table. The field parameter specifies the attribute of the
information to change.
SetDevInfoShort
is a function layered on top
of
SetDevInfo
for languages (such as BASIC) that cannot typecast
the fieldvalues of
SetDevInfo
.
SetDevInfoShort
changes only the
fields of
SetDevInfo
that are 16-bit integers. Possible fields include
the Commander’s logical address, mainframe number, slot,
manufacturer ID number, model code, device class, VXI address space
allocated, VXI interrupt lines/handlers allocated, protocols supported,
and so on. You should use this function only in very special situations,
because it updates information in the NI-VXI interface and can affect
execution. At the startup of your application,
InitVXIlibrary
completely initializes the RM table to how the RM configured the VXI
system. No initial changes are necessary for VXI devices.
SetDevInfoStr (la, field, stringvalue)
SetDevInfoStr
changes information about the specified device in the
NI-VXI RM table. The field parameter specifies the attribute of the
information to change.
SetDevInfoStr
is a function layered on top of
SetDevInfo
for languages (such as BASIC) that cannot typecast the
fieldvalues of
SetDevInfo
.
SetDevInfoStr
returns only the fields
of
SetDevInfo
that are character strings. Possible fields include the
device name, manufacturer name, and model name. You should use
this function only in very special situations, because it updates
information in the NI-VXI interface and can affect execution. At the
startup of your application,
InitVXIlibrary
completely initializes
the RM table to how the RM configured the VXI system. No initial
changes are necessary for VXI devices.
Commander Word Serial Protocol Functions
Word Serial communication is the minimal mode of communication
between VXI message-based devices within the VXI
Commander/Servant hierarchy. The Commander Word Serial functions
let the local CPU (the CPU on which the NI-VXI interface resides)
perform VXI message-based Commander Word Serial communication
with its Servants. The four basic types of Commander Word Serial
transfers are as follows:
•
Command sending
•
Query sending