9.3 Communication Methods
128
Program Messages
Program messages can be either Command Messages or Query Messages.
•
Command Messages
Instructions to control the instrument, such as to change settings or reset
<Ex.>
instruction to set the upper-limit test value for withstand-voltage test
:CONFigure:WITHstand:CUPPer 5.0
• Query Messages
Requests for responses relating to results of operation or measurement, or
the state of instrument settings.
<Ex.>
Command requesting for upper-limit test value of current withstand test.
:CONFigure:WITHstand:CUPPer?
For details:
"Headers" (p. 129), "Separators" (p. 130), "Data Formats" (p. 130)
Response Messages
When a query message is received, its syntax is checked and a response mes-
sage is generated.
The "
:HEADer" command determines whether headers are prefixed to
response messages.
For common commands, headers are not included regardless of the
"
:HEADer" command choices.
Header ON
:CONFigure:WITHstand:CUPPer 5.0
Header OFF 5.0
Upper-limit test value of current withstand test is 5.0 mA.
At power-on, Header ON is selected.
If an error occurs when a query message is received, no response message is
generated for that query.
Command Syntax
Command names are chosen to mnemonically represent their function, and can
be abbreviated. The full command name is called the "long form", and the abbre-
viated name is called the "short form".
The command references in this manual indicate the short form in upper-case
letters, extended to the long form in lower case letters, although the commands
are not case-sensitive in actual usage.
Response messages generated by the instrument are in long form and in upper
case letters.
9.3.1 Message Format
Header portion
Space Data portion
Question Mark
Header portion
:HEADER
OK (long form)
:HEAD
OK (short form)
:HEADE
Error
:HEA
Error
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