Gaussmeter IGM11 Operating Instructions
Chapter 9 Serial Interfaces
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9.10
User Data
The transfer parameters of the interface, e.g. the data rate can be set in the set-up
menu.
9.10.1
Character Set
The ASCII character set is used. The following control characters are used:
Value
Character
Decimal
Octal
Hexadecimal
Function
<LF>
10
012
0A
End of command line
<CR>
13
015
0D
Feed
<STX>
2
002
02
Abort
Other control characters, e.g. tabulator (0x09h), can be sent from an external
controller in order to get a clear format. They will be ignored by the IGM11.
9.10.2
Introduction to the SCPI Language
The programming language SCPI (Standard Commands for Programmable Devices)
defines the way a measuring device (here the gaussmeter) can communicate with a
controller. The SCPI language uses a hierarchical structure. The command tree
consists of root node commands that are placed on top and several levels below
each root node command. You have to specify the complete path to execute
commands of the lower levels.
9.10.2.1
Command Structure
The commands generally have a short and a long form. In the following descriptions,
the short form is written in upper case. The appended long form is written in lower
case. Only the characters of the short form are checked for syntactic correctness. The
evaluation of a command is case insensitive. The same applies to the parameters. A
parameter is always written in long form and in upper case.
9.10.2.2
Path Separator “:“
A command of the root node starts with a colon. A colon between two commands
separates one hierarchical level from the subsequent lower level. You can omit the
colon at the beginning of a command if the command is the first of a new command
line.
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