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Chapter 3 Software Overview
© National Instruments Corporation 3-17 NI-VXI User Manual
DefaultWSScmdHandler (cmd)
DefaultWSScmdHandler
is the default handler for the
WSSwrt
interrupt, which
InitVXIlibrary
automatically installs when it
initializes the NI-VXI software. The current
WSScmdHandler
is called
whenever the local CPU Commander sends any Word Serial Protocol
command or query (other than BAV or BREQ). While Word Serial
operations are enabled, the
WSScmd
interrupt handler is called every
time a Word Serial command is received (other than BAV if a
WSSrd
call is pending, or BREQ if a
WSSwrt
call is pending).
DefaultWSScmdHandler
parses the commands and takes appropriate
action. If it is a query, it returns a response using the
WSSsendResp
function. If it is a command, it calls the
WSSnoResp
function to
acknowledge it. If either a BREQ or BAV command is received via this
handler, it calls
GenProtError
with the corresponding protocol error
code (DOR violation or DIR violation). For unsupported commands,
the protocol error code sent to
GenProtError
is
UnSupCom
.
DefaultWSSEcmdHandler (cmdExt, cmd)
DefaultWSSEcmdHandler
is the default handler for the
WSSwrt
interrupt, which
InitVXIlibrary
automatically installs when it
initializes the NI-VXI software. The current
WSSEcmdHandler
is
called whenever the local CPU Commander sends any Extended
Longword Serial Protocol command or query. While Word Serial
operations are enabled, the
WSSEcmdHandler
is called whenever a
Longword Serial command is received.
WSSEcmdHandler
must parse
the commands and take the appropriate action. Because the VXI
specification does not define any Extended Longword Serial
commands,
DefaultWSSEcmdHandler
calls
GenProtError
with a
protocol error code of
UnSupCom
for every Extended Longword Serial
command received.
DefaultWSSLcmdHandler (cmd)
DefaultWSSLcmdHandler
is the default handler for the
WSSwrt
interrupt, which
InitVXIlibrary
automatically installs when it
initializes the NI-VXI software. The current
WSSLcmdHandler
is
called whenever the local CPU Commander sends any Longword Serial
Protocol command or query. While Word Serial operations are
enabled, the
WSSLcmdHandler
is called whenever a Longword Serial
command is received. The
WSSLcmdHandler
must parse the
commands and take the appropriate action. Because the VXI
specification does not define any Longword Serial commands,