
26
AT45xx User's Guide
9.
Command Reference
This chapter contains reference information on programming AT45xx with the SCPI
commands.
Terminator
Notation Conventions and Definitions
Header and Parameters
Command Reference
This chapter provides descriptions of all the AT45xx's available RS-232 commands which
correspond to Standard Commands for Programmable Instruments (SCPI) command sets, listed
in functional subsystem order.
9.1
Terminator
<NL>
:
The EOI line is asserted by New Line or ASCII Line Feed character (decimal 10, Hex 0x0A
,
or
ASCII ‘\n’)
9.2
Notation Conventions and Definitions
The following conventions and definitions are used in this chapter to describe RS-232 operation.
< > Angular brackets enclose words or characters that are used to symbolize a program code parameter or
an RS-232 command.
[ ] A square bracket indicates that the enclosed items are optional.
\n Command Terminator
9.3
Command Structure
The AT45xx commands are divided into two types: Common commands and SCPI commands.
The common commands are defined in IEEE std. 488.2-1987, and these commands are common for all
devices. The SCPI commands are used to control all of the AT45xx's functions.
The SCPI commands are tree structured three levels deep. The highest level commands are called the
subsystem commands in this manual. So the lower level commands are legal only when the subsystem
commands have been selected.
A colon (
:
) is used to separate the higher level commands and the lower level commands.
Semicolon (;) A semicolon does not change the current path but separates two commands in the same message.
Figure 9-1
Command Tree Example
Example:
ROOT:COMmand3:COMmand5 ppp
ROOT
Subsystem Command
COMmand3
Level 2
COMmand5
Level 3
ppp
Parameter
The basic rules of the command tree are as follows.
ROOT
COMmand1
COMmand2
COMmand3
COMmand4
COMmand5