ITech IT8200 Series Programming Guide

SCPI Introduction
Copyright © ITECH Electronic Co., Ltd. 4
DELAY. In the short form, the header has only the first three or four letters, such
as VOLT, STAT and DEL.
Query indicator
Following a header with a question mark turns it into a query (VOLTage?,
VOLTage:PROTection?). If a query contains a parameter, place the query
indicator at the end of the last header (VOLTage:PROTection?MAX).
Message unit separator
When two or more message units are combined into a compound message,
separate the units with a semicolon (STATus:OPERation?;QUEStionable?).
Root specifier
When it precedes the first header of a message unit, the colon becomes the root
specifier. It tells the command parser that this is the root or the top node of the
command tree.
Message terminator
A terminator informs SCPI that it has reached the end of a message. Three
permitted message terminators are:
⚫ newline (<NL>), decimal 10 or hexadecimal 0X0A in ASCII.
⚫ end or identify (<END>)
⚫ both of the above (<NL><END>).
In the Examples of this guide, there is an assumed message terminator at the end
of each message.
Command execution rules
⚫ Commands execute in the order that they are presented in the program
message.
⚫ An invalid command generates an error and, of course, is not executed.
⚫ Valid commands that precede an invalid command in a multiple command
program message are executed.
⚫ Valid commands that follow an invalid command in a multiple command
program message are ignored.
1.4 Response Data Type
Character strings returned by query statements may take either of the following
forms, depending on the length of the returned string:
⚫ <CRD>: character response data. Permits the return of character strings.
⚫ <AARD>: arbitrary ASCII response data. Permits the return of undelimited
7-bit ASCII. This data type has an implied message terminator.
⚫ <SRD>: string response data. Returns string parameters enclosed in double
quotes.
⚫ <Block>: arbitrary block data.
Response messages
A response message is the message sent by the instrument to the computer in

ITech IT8200 Series Specifications

General

Brand	ITech
Model	IT8200 Series
Category	Measuring Instruments
Language	English