DISCRETE PARAMETERS:
Discrete parameters are used to program settings that have a limited number
of values (like BUS, EXTernal, NORmal, and INVerted). They have a short forms and
a long form just like command keywords. You can mix upper case and lower-case
letters. Query responses will always return the short form in upper-case letters.
BOOLEAN PARAMETERS:
Boolean Parameters represent a single binary condition that is either TRUE or
FALSE. For a false condition the instrument will accept “OFF” or “0”. For a true
condition this instrument will accept “ON” or “1”. When you query a Boolean setting,
the instrument will always return a “0” or “1”.
STRING PARAMETERS:
String Parameters can contain virtually any set of ASCII characters. A STRING
must begin and end with matching quotes, either with a single
Quote or with a double quote. You can include the quote delimiter as part of the
string by typing it twice without any characters in between.
6.5.2 Input Message Terminators
Program Messages sent to an SCPI instrument must terminate with a <
NEWLINE > character. The IEEE-488 EOI (END OR IDENTITY) signal is interpreted
as a < NEWLINE > character and may also be used to terminate a message in
place of the < NEWLINE > character. Many programming languages allow you to
specify a message terminator character or EOI state to be automatically sent with
each BUS transaction. Message termination will always set the current path back to
the root-level.
6.5.3 SCPI Goals
The goal of Standard Commands for Programmable Instruments (SCPI) is to
reduce Automatic Test Equipment (ATE) program development time. SCPI accom-
plishes this goal by providing a consistent programming environment for instrument
control and data usage. This consistent
Programming environment is achieved by the use of defined program mes-
sages, instrument responses and data formats across all SCPI instruments, regard-
less of manufacturer.
The advantage of SCPI for the ATE system programmer is reducing the time
learning how to program new SCPI instruments after programming their first SCPI
instrument.
By providing a consistent programming environment, replacing one SCPI
instrument with another SCPI instrument in an ATE system will usually require less
effort than with non-SCPI instruments.
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