AMETEK Lx Series II Programming Manual - Manual (Page 20)

Programming Manual Lx \ Ls Series II
16
VOLT : LEV 80 ; PROT 88 ; : CURR?
Headers
Data
Message Unit
Query Indicator
Header
Separator
Message
Unit
Separator
Root Specifier
Message
Terminator
Figure 2-2: Command Message Structure
The basic parts of the above message are:
Message Component Example
Headers VOLT LEV PROT CURR
Header Separator The colon in VOLT:LEV
Data 80 88
Data Separator The space in VOLT 80 and PROT 88
Message Units VOLT:LEV 80 PROT 88 CURR?
Message Unit Separator The semicolons in VOLT:LEV 80; and PROT 88;
Root Specifier The colon in PROT 88;:CURR?
Query Indicator The question mark in CURR?
Message Terminator The (newline) indicator. Terminators are not part of the SCPI syntax
2.5.3 Headers
Headers are instructions recognized by the AC source. Headers (which are sometimes known as
"keywords") may be either in the long form or the short form.
Long Form The header is completely spelled out, such as VOLTAGE, STATUS, and
DELAY.
Short Form The header has only the first three or four letters, such as VOLT, STAT,
and DEL.
The SCPI interface is not sensitive to case. It will recognize any case mixture, such as TRIGGER,
Trigger, TRIGger. Short form headers result in faster program execution.
Header Convention
In the command descriptions in chapter 3 of this manual, headers are emphasized with boldface
type. The proper short form is shown in upper-case letters, such as DELay.
Header Separator
If a command has more than one header, you must separate them with a colon (VOLT:PROT
OUTPut:RELay:POLarity).
Optional Headers
The use of some headers is optional. Optional headers are shown in brackets, such as
OUTPut[:STATe] ON. As previously explained under "The Effect of Optional Headers", if you