National Instruments NI-VXI - Manual (Page 55)

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,