B&K Precision 4078 - Manual - Manual (Page 44)

c) LF being sent with EOI true.
The Program Message Unit can be divided into three sections as follows:
a) Program Header
The Program Header represents the operation to be performed, and consists of ASCII character mnemonics. Two
types of Program Headers are used in the 4075 & 4078: Instrument-control headers and Common Command and
Query headers. A Program Header may consist of more than one mnemonic, in which case the mnemonics are
separated from each other by the colon (':'). For instrument control commands, the mnemonics are specified by the
SCPI standard, and indicate the tree structure of the command set. The first mnemonic indicates the subsystem being
controlled. Common Command and Query Program Headers consist of a single mnemonic prefixed by an asterisk
('*').
The mnemonics consist of upper - or lower-case alpha characters. Mnemonics may be written in either the long
form, in which the entire mnemonic is written out, or the short form, in which only a specified portion of the
mnemonic is written out. Some mnemonics have only one form due to their short length. Where a command is
described, the portion appearing in upper case is the short form. Only the short form or the long form may be used.
Example: The command to set the frequency to 1KHz may be written in the following ways:
SOURCE:FREQUENCY 1KHZ
SOUR:FREQ 1KHZ
SOURCE:FREQ 1KHZ
Some mnemonics in a specified Program Header may be optional. This is indicated in the command description by
the mnemonic being enclosed in square brackets ([...]). This means it is not necessary to write the mnemonic into the
Program Header: it is a default condition. The 'SOURCE' mnemonic, for example, is optional. Not specifying it will
cause the device to search for the mnemonics in the Program Header under the Source Subsystem. For example, the
frequency may be set by the commands
FREQ:CW 1KHz
FREQ 1KHz
since the 'CW' mnemonic is also optional.
b) Program Header Separator
The Program Header Separator is used to separate the program header from the program data. It consists of one or
more whitespace characters, denoted as <ws>. Typically, it is a space.
c) Program Data
The Program Data represent the values of the parameters being set, for example, the '1KHZ' in the above
examples. Different forms of program data are accepted, depending on the command. The Program Data types used
in the instrument are:
i) Character program data
This form of data is comprised of a mnemonic made up of lower - or upper-case alpha characters. As with Program
Header mnemonics, some Character Data mnemonics have short and long forms. Only the short or the long form
may be used.
ii) Boolean data
Boolean data indicate that the parameter can take one of two states, ON or OFF. The parameter may be character
type
ON or OFF