Hioki 3541 - Page 107

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8.4 Communication Methods
Response
Messages
When a query message is received, its syntax is checked and a
response message is generated.
The ":SYSTem:HEADer" command determines whether headers are
prefixed to response messages.
Header ON :RESISTANCE:RANGE 110.000E+03
Header OFF 110.000E+03
(the current resistance measurement range is 100 kΩ)
At power-on, Header OFF is selected.
If an error occurs when a query message is received, no response
message is generated for that query.
No header is applied to commands used only for queries, such as
:FETCH? and :CALCulate:LIMit:RESult?.
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 abbreviated 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.
Headers Headers must always be prefixed to program messages.
(1) Command Program Headers
There are three types of commands: Simple, Compound and
Standard.
• Headers for Simple Commands
This header type is a sequence of letters and digits
:ESE 0
• Headers for Compound Commands
These headers consist of multiple simple command type headers
separated by colons ":"
:SAMPle:RATE
• Headers for Standard Commands
This header type begins with an asterisk "*",
indicating that it is a standard command defined by IEEE 488.2.
*RST
(2) Query Program Header
These commands are used to interrogate the instrument about the
results of operations, measured values and the current states of
instrument settings.
As shown by the following examples, a query is formed by appending
a question mark "?" after a program header.
:FETCh?
:MEASure:RESistance?
FUNCTION
OK (long form)
FUNC
OK (short form)
FUNCT
Error
FUN
Error