California Instruments 2001RP, User And Programming Manual

Page: 87 / 130

User and Programming Manual - Rev N
Message Component Example
Headers SOURC VOLT FREQ CURR
Header Separator The colon in SOUR:VOLT
Data 80 60
Data Separator The space in VOLT 80 and FREQ 60
Message Units VOLT 80 FREQ 60 CURR?
Message Unit Separator The semicolons in VOLT 80; and FREQ 60;
Root Specifier The colon in :CURR?
Query Indicator The question mark in CURR?
Message Terminator The <NL> (newline) indicator. Terminators are not part of the
SCPI syntax
Note: The use of compound messages such as the one shown in Figure 12-2 is
not recommended as they typically exceed the available receive buffer
length of the RP Series interface.
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, SYSTEM, and
OUTPUT.
Short Form The header has only the first three or four letters, such as VOLT, SYST, and
OUTP.
The SCPI interface is not sensitive to case. It will recognize any case mixture, such as
VOLTAGE, VOLTage or Voltage. Short form headers result in faster program execution.
Note: In view of the 45 character receive buffer size of the RP Series, the short
form is recommended under all circumstances.
Header Convention
In the command descriptions in chapter 10 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
(SYSTem:ERRor LIMit:FREQuency:LOW).
Optional Headers
The use of some headers is optional. Optional headers are shown in brackets, such as
VOLTage[:LEVel] 100.
78 April 2007 2001RP