BK Precision VSP12010, Инструкция по эксплуатации

Страница: 38 / 68

13). Before sending the unit into talk mode it is also advisable to
Flush out the controller’s data-in buffer by giving a dummy read. This is required
because some controller can keep the last data latched into its data-in Buffer.
14). If you send more than one query in a <PROGRAM MESSAGE>, only the LAST
correct query will be processed and response will be given for last query.
15). No response can be read without giving a query. Otherwise the query error bit will
be set & an error message is generated.
6.5 An Introduction to SCPI Language
Standard Commands for Programmable Instruments (SCPI) defines how you
communicate with an instrument from a BUS controller. The SCPI language uses a
hierarchical structure similar to the file systems used by many bus controllers. The
command “TREE” is organized with root-level commands (also called “SUB-
SYSTEMS”) positioned at the top, with multiple levels below each root level com-
mand. You must specify the complete path to execute the individual lower-level
commands.
USING A COLON (:)
When a colon is the first character of a command keyword, it indicates that the
next command mnemonic is a root-level command. When a colon is inserted be-
tween two-command mnemonics, the colon moves the path down one level in the
present path (for the specified root-level command) of the command tree. You must
separate the command mnemonics from each other using a colon. You can OMIT
the leading COLON if the command is the first of a new program line.
USING A SEMICOLON (;)
Use a semicolon to separate two commands within the same command
string. The semicolon does not change the present path specified. For example the
following two statements are equivalent.
: SOURce:VOLTage 10.55:SOURce:CURRent 2.50
: SOURce: VOLTage 10.55;CURRent 2.50
USING A COMMA (,)
If a command requires more than one parameter, you must separate the
adjacent parameters using a comma.
36