Introduction to Programming - 2

Combining Message Units

The following command message is briefly described here, with details in subsequent paragraphs.

Data

Message Unit

Headers

Query Indicator

VOLT:LEV 80 ;

PROT 88 ; : CURR? <NL>

Header Separator

Message Terminator

Message Unit Separators

 

Root Specifier

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

8088

 

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 <NL> (newline) indicator. Terminators are not part of the SCPI syntax

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.

NOTE: Short form headers result in faster program execution.

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