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Command Separator
Abbreviated Commands
Implied Commands
Variable Command
38 Relay Matrix Switch Command Reference
A colon (:) always separates one command from the next lower-level
command, such as [ROUTe:]SCAN:MODE? Colons separate the root
command from the second-level command ([ROUTe:]SCAN) and the
second level from the third level (SCAN:MODE?).
The command syntax shows most commands as a mixture of upper- and
lowercase letters. The uppercase letters indicate the abbreviated
spelling for the command. For shorter program lines, send the
abbreviated form. For better program readability, you may send the
entire command. The instrument will accept either the abbreviated form
or the entire command.
For example, if the command syntax shows DIAGnostic, DIAG and
DIAGNOSTIC are both acceptable forms. Other forms of DIAGnostic,
such as DIAGN or DIAGNOS will generate an error. You may use upper-
or lowercase letters. Therefore, DIAGNOSTIC, diagnostic, and
DiAgNoStIc are all acceptable.
Implied commands appear in square brackets ([ ]) in the command
syntax. The brackets are not part of the command and are not sent to the
instrument. Suppose you send a second-level command but do not send
the preceding implied command. In this case, the instrument assumes
you intended to use the implied command and it responds as if you had
sent it. Examine the [SOURce] subsystem shown below:
[SOURce:]
PULSe
:COUNt
:COUNt?
:PERiod
:PERiod?
The root command [SOURce:] is an implied command. To set the
instrument's pulse count to 25, you can send either of the following
command statements:
SOUR:PULS:COUN 25 or PULS:COUN 25
Some commands have what appears to be a variable syntax. For
Syntax
example, OUTP:ECLTn and OUTP:TTLTn. In these commands, the n is
replaced by a number. No space is left between the command and the
number because the number is not a parameter. The number is part of
the command syntax. In the case of OUTP:ECLTn, n can range from 0
to 1. In OUTP:TTLTn, n can range from 0 through 7.
Chapter 3
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