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100

101

Command Syntax

A quoted string

can include any character deﬁned in the 7-bit ASCII character

set. Follow these rules when you use quoted strings:

1. Use the same ty

pe of quote character to open and close the string. For

example:

"this is a valid string".

2. You can mix q

uotation marks within a string as long as you follow the

previous rule. For example:

"this is an ’acceptable’ str ing".

3. You c an in cl

ude a quote character within a string b y repeating the quote. For

example:

"here is a "" mark".

4. Strings ca

n have upper or lower case characters .

5. If you use a GPIB network, you cannot terminate a quoted string with the

END messa

ge before the closing delimiter.

6. A carriage return or line feed embedded in a quoted string does not terminate

the stri

ng. The return is treated as another character in the string.

7. The maximum length of a quoted string returned from a query is 1000

charac

ters.

Here are some invalid strings:

"Invalid string argum ent’ (quotes are not of the same type)

"test<EOI>" (termination character is embedded in the string)

Block

Several oscilloscope commands use a block argument form, as deﬁned in the

table below.

Table 2-12: Block Argument

Symbol Meaning

<NZDig>

A nonzero digit character in the range of 1–9

<Dig>

A digit character, in the range of 0–9

<DChar> A character with the hexadecimal equivalent of 00 through FF (0

through 255 decimal)

<Block>

A block of data bytes deﬁned as: <Block> ::=

{#<NZDig><Dig>[<Dig>...][<DChar>...] |#0[<DChar>...]<terminator>}

<NZDig> speciﬁes the number of <Dig> elements that follow. Taken together,

the <NZDig> and <Dig> elements form a decimal integer that speciﬁes how

many <DChar> elements follow.

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Tektronix DPO4000 Manuale Utente Pagina 18

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