SCPI Introduction
Copyright © ITECH Electronic Co., Ltd. 8
Commands requiring numerical parameter support the notations of all
common decimal notations, including optional signs, decimal points, scientific
notation, etc. Special values of numerical parameter are also acceptable,
such as MIN, MAX and DEF. In addition, suffixes for engineering units can
also be sent together with numerical parameter (including M, k, m or u). If the
command accepts only some specific values, the instrument will
automatically round the input parameter to acceptable values. The following
commands require numerical parameter of frequency value:
[SOURce[1|2]:]FREQuency:CENTer {<Frequency>|MINimum|MAXimum}
– <NR1>: represents an integer value, such as 273;
– <NR2>: represents a real number in floating-point format, such as .273;
– <NR3>: represents a real number in scientific notation, such as 2.73E+2;
– <Nrf>: The extensible form includes <NR1>, <NR2> and <NR3>;
– <Nrf+>: The extensible decimal form includes <Nrf>, MIN, MAX and DEF.
MIN and MAX are the minimum and maximum finite number. Within the range
of the parameter definition, DEF is the default of the parameter.
âš« Discrete parameter
Discrete parameter are used for settings with limited number of programming
values (such as IMMediate, EXTernal or BUS). They can use short and long
format like key words of commands. They may be expressed in both upper
and lower case. The query response always returns uppercase Parameter in
short format. The following commands require discrete parameter in voltage
unit:
[SOURce[1|2]:]VOLTage:UNIT {VPP|VRMS|DBM}
âš« Boolean parameter
Boolean parameter refer to true or false binary conditions. In case of false
conditions, the instrument will accept "OFF" or "0". In case of true conditions,
the instrument will accept "ON" or "1". In query of Boolean settings, the
instrument will always return "0" or "1". Boolean parameter are required by
the following commands:
DISPlay {OFF|0|ON|1}
âš« ASCII string parameter
String parameter may actually include all ASCII character sets. Character
strings must start and end with paired quotation marks; and single quotation
marks or double quotation marks are both allowed. Quotation mark
separators may also act as one part of a string, they can be typed twice
without any character added between them. String parameter is used in the
following command:
DISPlay:TEXT <quoted string>
For example, the following commands display message of "WAITING..."
(without quotation marks) on the front panel of the instrument.
DISP:TEXT "WAITING..."
Single quotation marks may also be used to display the same message.
DISP:TEXT 'WAITING...'
– <SPD>: string program data. String parameters enclosed in single or
double quotes.
– <CPD>: character program data.
1.7 Remote Interface Connection
IT7900 series power supplies are equipped with three communication interfaces
as standard: USB, LAN and CAN, and two optional interfaces: RS232 and GPIB.
Users can choose any one to realize communication with the computer. For
detailed introduction of remote interface connection, please refer to the content in
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