9.5 Communication Methods
106
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:RESet
• 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, mea-
sured 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?
:CALCulate:LIMit:REFerence?
Message Terminators
This instrument recognizes the following message terminators:
From the instrument's interface settings, the following can be selected as the terminator for
response messages.
See: "Delimiter Setting" (p. 135)
Characters within square brackets [ ] may be omitted.
:SENSe:FUNCtion
:FUNCtion
[:SENSe:]FUNCtion
Either form is valid
• LF
• CR+LF
• EOI
• LF with EOI
• CR
• CR+LF
• LF with EOI (initial setting)
• CR+LR with EOI
• CR+LF
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