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Programming Guide 1-37

ESG Family Signal Generators Preparing for Use

Getting Started with SCPI

Response Message Syntax

Figure 1-15. Simplified Response Message Syntax

Response messages can contain both commas and semicolons as separators. When a single

query command returns multiple values, a comma separates each data item. When

multiple queries are sent in the same message, the groups of data items corresponding to

each query are separated by a semicolon. For example, the fictitious query

:QUERY1?:QUERY2? might return a response message of:

,;,

Response data types are explained later in this subsection. Note that <new line><END> is

always sent as a response message terminator.

SCPI Data Types

SCPI defines different data formats for use in program messages and response messages.

It does this to accommodate the principle of forgiving listening and precise talking.

Forgiving listening means that instruments are flexible, accepting commands and

parameters in various formats. Precise talking means an instrument always responds to a

particular query in a predefined, rigid format. Parameter data types are designed to be

flexible in the spirit of forgiving listening. Conversely, response data types are defined to

meet the requirements of precise talking.

Parameter Types Response Data Types

Numeric

Extended Numeric

Real or Integer

Integer

Discrete Discrete

Boolean Numeric Boolean

String String

Block Definite Length Block (all interfaces)

Indefinite Length Block

(not supported with RS-232)

Non-decimal Numeric Hexadecimal

Octal

Binary

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 258 259

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