User manual
IEEE-488 Reference
4-32 2001-900-01 Rev. J / October 2009
:TRACe:FEED:CONTrol PRETrigger
<NRf> Numeric representation format: This parameter is a
number that can be expressed as an integer (e.g., 8), a real number (e.g., 23.6) or an expo-
nent (2.3E6). Example:
:SYSTem:KEY 16 “Press” NEXT key from over the bus.
<n> Numeric value: A numeric value parameter can consist
of an NRf number or one of the following name parameters; DEFault, MINimum or MAX-
imum. When the DEFault parameter is used, the instrument will be programmed to the
*RST default value. When the MINimum parameter is used, the instrument will be pro-
grammed to the lowest allowable value. When the MAXimum parameter is used, the instru-
ment will be programmed to the largest allowable value. Examples:
:TRIGger:TIMer 0.1 Sets timer to 100msec.
:TRIGger:TIMer DEFault Sets timer to 1sec.
:TRIGger:TIMer MINimum Sets timer to 1msec.
:TRIGger:TIMer MAXimum Sets timer to 999999.999sec.
Angle brackets < >: In this manual, angle brackets (<>) are used to denote parameter type.
Do not include the brackets in the program message. For example:
:SOURce:TTL2 <b>
The <b> indicates that a Boolean type parameter is required. Thus, to set digital input line
#2 true, you must send the command with the ON or 1 parameter as follows:
:SOURce:TTL2 ON or :SOURce:TTL2 1
2. Query commands: This type of command requests (queries) the currently programmed
status. It is identified by the question mark (?) at the end of the fundamental form of the
command. Most commands have a query form. Examples:
*OPT? Common query command.
:TRIGger:TIMer? SCPI query command.
Most commands that require a numeric parameter (<n>) can also use the DEFault, MINi-
mum, and MAXimum parameters for the query form. These query forms are used to deter-
mine the *RST default value, and the upper and lower limits for the fundamental command.
Examples:
:TRIGger:TIMer? DEFault Queries the *RST default value.
:TRIGger:TIMer? MINimum Queries the lowest allowable value.
:TRIGger:TIMer? MAXimum Queries the largest allowable value.
3. Case sensitivity: Common commands and SCPI commands are not case sensitive. You can
use upper or lower case, and any case combination. Examples:
*RST = *rst
:SCAN? = :scan?
:SYSTem:PRESet = :system:preset