Kepco KLR Series Developers Guide Manual de usuario descargar pdf (Pagina 81)

KLR-DEV 060713 6-5

6.5.3 QUERY INDICATOR

The question mark (?) following a keyword is a query indicator. This changes the command into

a query. If there is more than one keyword in the command, the query indicator follows the last

keyword. (e.g., VOLT? and MEAS:CURR?).

6.5.4 DATA

Some commands require data to accompany the keyword either in the form of a numeric value

or character string. Data always follows the last keyword of a command or query (e.g.,

VOLT:LEV:TRIG 14 or SOUR:VOLT? MAX

6.5.5 DATA SEPARATOR

Data must be separated from the last keyword by a space (e.g., VOLT:LEV:TRIG 14 or

SOUR:VOLT? MAX

6.5.6 MESSAGE UNIT SEPARATOR

When two or more message units are combined in a program message, they must be separated

by a semicolon (;) (e.g., VOLT 15;MEAS:VOLT? and CURR 12; CURR:TRIG 12.5).

6.5.7 ROOT SPECIFIER

The root specifier is a colon (:) that precedes the first keyword of a program message. This

places the parser at the root (top left, Figure 6-2) of the command tree. Note the difference

between using the colon as a keyword separator and a root specifier in the following examples:

VOLT:LEV:IMM 16 Both colons are keyword separators.

:CURR:LEV:IMM 4 The first colon is the root specifier, the other two are keyword separators.

VOLT:LEV 6;:CURR:LEV 15 The second colon is the root specifier, the first and third are key-

word separators

:INIT ON;:TRIG;:MEAS:CURR?;VOLT? The first three colons are root specifiers.

6.5.8 MESSAGE TERMINATOR

The message terminator defines the end of a message. One message terminator is permitted:

• new line (<NL>), ASCII 10 (decimal) or 0A (hex)

NOTE: Kepco power supplies require a message terminator at the end of each program mes-

sage. The examples shown in this manual assume a message terminator will be added

at the end of each message. Where a message terminator is shown it is represented

as <NL> regardless of the actual terminator character.

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Kepco KLR Series Developers Guide Manual de usuario Pagina 81