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38 RF Multiplexer Command Reference
Chapter 4
Command Separator
A colon (:) always separates one command from the next lower level
command, such as ROUTe:CLOSe? Colons separate the root command
from the second level (ROUTe:CLOSe?). If a third level exists, the second
level is also separated from the third level by a colon.
Abbreviated Commands
The command syntax shows most commands as a mix of upper and lower
case letters. The upper case letters indicate the abbreviated spelling for the
command. For shorter program lines, send only the abbreviated form. For
better program readability, you may send the entire command. The
instrument will only accept either the abbreviated form or the entire
command.
For example, if the command syntax shows CLOSe, CLOS and CLOSE are
both acceptable forms. Other forms of CLOSe, such as CL or CLO will
generate an error. You may use upper or lower case letters. Therefore,
CLOSE, and ClOsE are both acceptable.
Implied Commands
Implied commands are those which 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 intend to use the implied command and it responds as if you
had sent it. Examine the portion of the ROUTe subsystem shown below:
[ROUTe:]
CLOSe? <channel_list>
The root command ROUTe: is an implied command. To make a query about
a channel’s present status, you can send either of the following command
statements:
ROUT:CLOSe? <channel_list> or CLOSe? <channel_list>
Parameters
This table contains explanations and examples of parameter types that can
be used.
Parameter
Type
Explanations and Examples
Numeric Accepts all commonly used decimal representations of numbers including
optional signs, decimal points, and scientific notation, such as 123 or
1.23E2; -123 or -1.23E2; .123, 1.23E-1, or 1.23000E-01. Special cases
include MIN, MAX, and DEF. MIN selects minimum value available, MAX
selects maximum value available, and DEF selects default or reset value.
Boolean Represents a single binary condition that is either true or false (1 or ON;
0 or OFF)
Discrete Selects from a finite number of values. These parameters use mnemonics
to represent each valid setting. An example is the TRIGger:SOURce
<
source > command where < source > can be BUS, HOLD, or IMMediate.
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