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Introduction to Programming - 2
23
SCPI Data Formats
All data programmed to or returned from the ac source is ASCII. The data may be numerical or character
string.
Numerical Data Formats
Symbol Data Form
Talking Formats
<NR1>
Digits with an implied decimal point assumed at the right of the least-significant digit.
Examples: 273
<NR2>
Digits with an explicit decimal point. Example: .0273
<NR3>
Digits with an explicit decimal point and an exponent. Example: 2.73E+2
<Bool>
Boolean Data. Example: 0 | 1 or OFF | ON (0 = OFF; 1 = ON)
Listening Formats
<Nrf>
Extended format that includes <NR1>, <NR2> and <NR3>. Examples: 273273. 2.73E2
<Nrf+>
Expanded decimal format that includes <NRf> and MINMAX. Examples: 273 73.2 .73E2
MAX. MIN and MAX are the minimum and maximum limit values that are implicit in the
range specification for the parameter.
<Bool>
Boolean Data. Example: 0 | 1
Suffixes and Multipliers
Class Suffix Unit Unit with Multiplier
Current A ampere MA (milliampere)
Amplitude V volt MV (millivolt)
Time S second MS (millisecond)
Frequency HZ Hertz KHZ (kilohertz)
Common Multipliers
1E3 K kilo
1E-3 M milli
1E-6 U micro
Character Data
Character strings returned by query statements may take either of the following forms, depending on the
length of the returned string:
<CRD>
Character Response Data. Permits the return of character strings.
<AARD>
Arbitrary ASCII Response Data. Permits the return of undelimited 7-bit ASCII. This data type
has an implied message terminator.
<SRD>
String Response Data. Returns string parameters enclosed in double quotes.