Tabor Electronics Ltd. - OED

4-9. SCPI Parameter Types
The SCPI language defines several different data formats
to be used in program messages and response
messages.
4-9-1. Numeric Parameters
Commands that require numeric parameters will accept
all commonly used decimal representations of numbers
including optional signs, decimal points, and scientific
notation. Special values for numeric parameters like
MINimum and MAXimum are also accepted.
You can also send engineering unit suffixes with numeric
parameters (e.g., Mhz or Khz). If only specific
numeric values are accepted, the function generator
will ignore values which are not accepted and will generate
an error message. The following command is an
example of a command that uses a numeric parameter:
“VOLT:AMPL { | MIN | MAX}
4-9-2. Discrete Parameters
Discrete parameters are used to program settings that
have a limited number of values (like FIXed, USER,
and SEQuence). They have a short form and a long
form just like command keywords. You can mix upperand
lower-case letter. Query responses will always return
short form in all upper-case letters. The following
command uses discrete parameters:
SOUR:FUNC:MODE {FIXed | USER | SEQuence}
4-9-3. Boolean Parameters
Boolean parameters represent a single binary condition
that is either true or false. For a false condition, the
generator will accept “OFF” or “0". For a true condition,
the generator will accept ”ON" or “1". When you query
a boolean setting, the instrument will always return
”0" or “1". The following command uses a boolean
parameter:
OUTP:FILT { OFF | ON }
The same command could be written as follows:
OUTP:FILT {0 | 1 }
4-9-4. Arbitrary Block Parameters
Arbitrary block parameters are used for loading waveforms
to the generator’s memory. The Model 8024 can
accept binary blocks of data, files that contain binary
data, and files that contain ASCII data. The following
command uses an arbitrary block parameter that is
loaded as binary data:
TRAC:DATA
4-10. Setting the GPIB Address
GPIB address is modified using front panel programming.
The GPIB address is stored in the non-volatile
memory. To change the address press the [SYSTEM]
button. The display reading will change as follows:
GPIB address 19
commands SCPI
At this point, if you want to change the GPIB address,
rotate the dial until the display reads the required address.
To resume normal operation, press any front
panel key.
4-11. Selecting a Command Set
The Model 8024 can accept two sets of commands:
SCPI commands and short-form commands. The SCPI
set of commands is the default setting of the generator.
The short-form commands set is available for those
programmers who do not want to use the lengthy programming
code that SCPI requires.
The short-form command set speeds bus communications
and is also required in conjunction with WaveCAD
operation. Appendix C lists the short-form command
set. Selection of which command set is used as GPIB
protocol is done from the front panel. To change the
GPIB command set press the [SYSTEM] button, then
press the cursor button to move the cursor one menu
down. Rotate the dial. The display toggles between
“SCPI” and “std.”. Select the required command set
and press any front panel key to resume normal operation.
If you select to use the “std”. set of commands
make sure that the generator displays the following:
GPIB address 19
commands std.
Remote Interface
4-12. SCPI Command Summary
Table 4-1 summarizes the complete SCPI command
tree available to program the generator over the GPIB.
Tables 4-2 through Table 4-5 categorize these commands.
Refer to later sections in this manual for more
complete details on each command.
4-3