Ceyear 3986 Series, Руководство по программированию

Страница: 19 / 139

2 Remote Control
2.1 Remote control basis
11
-7.89E-01 exponent marker e may be upper or lower case
+256 l allowed
5 The decimal point can be prefixed
Extended numeric parameter
Most measurements related to Instrument-specific commands use extended numeric parameters to
specify the physical quantities. Extended numeric parameters receive all numeric parameters and
additional special values. All extended numeric parameters receive MAXimum and MINimum as
parameter values
。
Other special values, such as UP and DOWN are received by the instrument parsing
capability. SCPI command table will list all valid parameters.
Note: extended numeric parameters are not applicable to common commands or STATus subsystem
commands.
Examples of extended numeric parameters:
101 Numeric parameter
1.2 GHz The GHz can be used as an exponent (E009)
200 MHz The MHz can be used as an exponent (E006)
-100 mV -100 millivolts
10DEG 10 Degree
MAXimum Maximum valid setting
MINimum Minimum valid setting
UP Increase a step
DOWN Decrease a step
Discrete parameter
When there are a finite number of parameter values to be set, discrete parameters are used for
identification. A discrete parameter uses mnemonics to represent each valid setting. Like the SCPI
mnemonics, the discrete parameter mnemonics can be set in long and short formats, with both
capitalized and lowercase characters.
The following example illustrates the combined use of discrete parameter and command.
:TRIGger[:SEQuence]:SOURce BUS|IMMediate|EXTernal
BUS GPIB,LAN,RS-232 trigger
IMMediateImmediate trigger
EXTernal External trigger
Boolean parameter
Boolean parameters represent a single binary condition that is either true or false. There are only four
possible representations for a Boolean parameter.
Samples of Boolean parameters:
ON True
OFF False
1 True
0 False
String parameter