TheSENDstatement sends low level IEEE-488 commands and data bytes. IEEE-488 commands are sent with the ATN line asserted; whereas data bytes are sent without the ATN line asserted. The computer must be the active controller to useCMD,TALK,UNT,LISTEN,UNL,SEC,MTAorMLA. Any talk addressed device may sendDATA.
Message
Action Taken
CMD
Sends the expression values as command bytes.CMDwith no items asserts the ATN line.
DATA
Sends the expression values as data bytes. IfENDis added, EOI is set on the last data byte.
LISTEN
Sends the expression values as listen address commands.
MLA
Sends the Interface's Listen Address command.
MTA
Sends the Interface's Talk Address command.
SEC
Sends the expression values as secondary address commands.
TALK
Sends the expression value as a talk address command.