Scpi Data Formats; Bus Throughput And Timing Considerations - Ametek 2003RP User And Programming Manual

9.5 SCPI Data Formats

All data programmed to or returned from the AC source is in ASCII. The data type may be
numerical or character string.
Numerical Data Formats
Symbol
Talking Formats
<NR1>
<NR2>
<NR3>
<Bool>
Listening Formats
<Nrf>
<Bool>
Character Data
Character strings returned by query statements may take either of the following forms,
depending on the length of the returned string:
<CRD>
<AARD>
<SRD>

9.6 Bus Throughput and Timing Considerations

The 2001RP has a limit on how fast it can process commands sent over the bus. When
developing an application program that controls the 2001RP AC source, this must be
considered. Specifically, if non-query commands (commands that don‟t wait for a response
such as output setup commands) are sent at too high a rate, the AC source may not be able
to process them. In that case, a –100 Command Error will be reported.
This condition may exist on both RS232 and GPIB interface modes and is more prone when
faster controllers are used to run the application software. To prevent this condition, it will be
necessary to space out successive commands using a 20 msec delay. Alternatively,
commands could be sent to other instruments in the same system to accomplish the same
result.
Data Form
Digits with an implied decimal point assumed at the right of the least-
significant digit. Examples: 273
Digits with an explicit decimal point. Example:.0273
Digits with an explicit decimal point and an exponent. Example: 2.73E+2
Boolean Data. Example: 0 | 1
Extended format that includes <NR1>, <NR2> and <NR3>. Examples:
273.2 , 2.73E2
Boolean Data. Example: 0 | 1
Character Response Data. Permits the return of character strings.
Arbitrary ASCII Response Data. Permits the return of undelimited 7-bit
ASCII. This data type has an implied message terminator.
String Response Data. Returns string parameters enclosed in double
quotes.