Remote Control
5–4
MTD200 MPEG Test Decoder User Manual
Responses
are messages sent by the device to the controller following a query.
They may contain results, device settings, or information about the device status
(refer to Responses to Queries on page 5–8).
Structure and syntax of the device-dependent messages are described on page
5–4. Commands are listed and explained on page 5–12. The description of the
commands requires basic knowledge of the manual operation of the MPEG test
decoder.
Structure and Syntax of Device-Dependent Messages
Standard Commands for Programmable Instruments (SCPI) describes a
standardized command set for the programming of instruments, regardless of the
type of instrument or manufacturer. The objective of the SCPI Consortium is to
standardize device-specific commands to a large extent. For this purpose, an
instrument model has been developed which defines identical functions within
an instrument or of different instruments. Command systems have been
generated and assigned to these functions so that it is possible to address
identical functions by the same commands. The command systems have a
hierarchical structure. Figure 5–1 shows this tree structure, using a detail from
the SYSTem command system for controlling parts of the instrument setup. The
other examples of syntax and structure of the commands are taken from this
command system.
SCPI is based on the IEEE 488.2 standard; it uses the same syntax elements as
well as the common commands defined therein. The syntax of the responses is
partly subjected to stricter rules than laid down in the IEEE 488.2 standard (refer
to Responses to Queries on page 5–8).
The commands consist of a so-called header and usually one or more parameters.
Header and parameters are separated by a white space with an ASCII code of 0
to 9 or 11 to 32 decimal (for example, a space). The headers may be composed of
several keywords. The query form is generated by appending a question mark
directly to the header.
NOTE
. The commands used in the examples below are not necessarily implement-
ed in the instrument.
SCPI Introduction
Command Structure
Summary of Contents for MTD200
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