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2 - Introduction to Programming
16
NOTE:
All RS-232 response data sent by the dc source is terminated by the ASCII character pair
<carriage return><newline>. This differs from GPIB response data which is terminated by
the single character <newline> with EOI asserted.
SCPI Data Formats
All data programmed to or returned from the dc 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
Listening Formats
<Nrf>
Extended format that includes <NR1>, <NR2> and <NR3>. Examples: 273 273. 2.73E2
<Nrf+>
Expanded decimal format that includes <NRf> and MIN MAX. Examples: 273 273.
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 or ON | OFF
Suffixes and Multipliers
Class Suffix Unit Unit with Multiplier
Current A ampere MA (milliampere)
Amplitude V volt MV (millivolt)
Time S second MS (millisecond)
Common Multipliers
1E3 K kilo
1E-3 M milli
1E-6 U micro
Response Data Types
Character strings returned by query statements may take either of the 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.