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281, 282, 284
Users Manual
16-10
Remote Commands
RS232 Remote Command Formats
Serial input to the instrument is buffered in a 256 byt
e input queue which is filled, under
interrupt, in a manner transparent to all other instrument operations. The instrument will
send XOFF when approximately 200 characters are in the queue. XON will be sent
when approxi
mately 100 free spaces become available in the queue after XOFF was
sent. This que
ue contains raw (un-parsed) data which is parsed as it is required.
Commands and queries are executed in order and the parser will not start a new
command until any previous command or query is complete.
In non-addressable RS232 mode responses to commands or queries are sent immediately;
there is no output queue. In addressable
mode the response formatter will wait,
indefinitely if necessary, until the instrument is addressed to talk and the complete
response message has been sent, before allowing the parser to start the next command in
the input queue.
Commands must be sent as specified in the commands list and
must be terminated with
the command terminator code 0AH (line feed, LF). Commands may be sent in groups
with individual commands separated from each other by the code 3BH (semicolon). The
group must be terminated with command terminator 0AH (line feed, LF).
Responses from the instrument to the controller are sent as specifi
ed in the commands
list. Each response is terminated by 0DH (carriage return, CR) followed by 0AH (line
feed, LF).
<WHITE SPACE> is defined as character codes 00H to 20H inclusive with the
exception of t
hose which are specified as addressable RS232 control codes.
<WHITE SPACE> is ignored except in command identifiers (thus, for exam
ple,
*
C LS is not equivalent to
*
CLS.
The high bit of all characters is ignored.
The commands are not case-sensitive.
GPIB Remote Command Formats
GPIB input to the instrument is buffered in a 256 byt
e input queue which is filled, under
interrupt, in a manner transparent to all other instrument operations. The queue contains
raw (un-parsed) data which is taken by the parser as required. Commands (and queries)
are executed in order and the parser will not start a new command until any previous
command or query is complete. There is no output queue which means that the response
formatter will wait, indefinitely if necessary, until the instrument is addressed to talk and
the complete response message has been sent before the parser is allowed to start the next
command in the input queue.
Commands are sent as <PROGRAM MESSAGES> by the controller, each message
consisting of
zero or more <PROGRAM MESSAGE UNIT> elements separated by
<PROGRAM MESSAGE UNIT SEPARATOR> elements.
A <PROGRAM MESSAGE UNIT> is any of the commands in the remote commands
list.
A <PROGRAM MESSAGE UNIT SEPARATOR> is the semi-colon character ';' (3BH).
<PROGRAM MESSAGES> are separated by <PROGRAM MESSAGE TERMINATOR>
elements which may be any of the following:
1.888.610.7664 sales@GlobalTestSupply.com
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