Programming Guide – 46
Program Message Formats
A program message consists of a command header, followed by its required parameters. The
parameters must be separated from the command header by a space, for example,
:INPUT:ATTENUATION 10. Multiple parameters must be separated by a comma (,).
Each program message can contain one or more message units. The message units in a
program message must be separated by a semicolon (;), for example,
:INPUT:ATTENUATION 10;INPUT:OFFSET 20
Terminating a Program Message
The terminating sequence <LF> (ASCII character 10) or an EOI sent with character signals the
attenuator that the end of the program message has been received. When an EOI is received
with any character other than the terminating sequence <LF>, <LF> is put in the input queue
immediately after the character. This action applies only to characters sent through the GPIB
interface because the RS232 interface does not have an EOI signal.
The terminating sequence <LF> does not always appear in the program examples provided in
this section; however, it is implied.
Command Header Variations
Each command header in the command tree has both a long form and a short form. Either
form is acceptable and each gives identical responses; for example, the following two
message units both set the attenuation to 10 dB.
:INPUT:ATTENUATION 10 dB
:inp:att 10db
The query form of a command must end with a question mark; for example, the query form of
:INPUT:ATT is :INPUT:ATT?.
A command can be entered in either uppercase or lowercase characters.
Specifying the Command Path
To use a command in the command tree, the attenuator must know the full path to the
command. If the command is the first one in the program message, the command header must
contain the full path to the command. Subsequent commands in the same program message
are automatically referenced in the same path as the previous command, unless the command
header is preceded by a colon (:), in which case the full path to the command must be included
in the command header.
:INPut
:OFFSet <value>
:DISPlay <value>
:WAVelength <value>
The following program messages are valid:
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