10-14
Remote Operations
Model 2520 User’s Manual
:stat:oper:enab <NRf>
:stat:oper:enab?
:stat:pres
In each of the above program messages, the path pointer starts at the root command (:stat)
and moves down the command levels until the command is executed.
Multiple command messages
You can send multiple command messages in the same program message as long as they
are separated by semicolons (;). The following is an example showing two commands in
one program message:
:stat:oper; :stat:oper:enab <NRf>
When the above is sent, the first command word is recognized as the root command (:stat).
When the next colon is detected, the path pointer moves down to the next command level
and executes the command. When the path pointer sees the colon after the semicolon (;), it
resets to the root level and starts over.
Commands that are on the same command level can be executed without having to retype
the entire command path. Example:
:stat:oper:enab <NRf>; enab?
After the first command (:enab) is executed, the path pointer is at the third command level
in the structure. Since :enab? is also on the third level, it can be typed in without repeating
the entire path name. Notice that the leading colon for :enab? is not included in the pro-
gram message. If a colon were included, the path pointer would reset to the root level and
expect a root command. Since :enab? is not a root command, an error would occur.
Command path rules
•
Each new program message must begin with the root command, unless it is
optional (e.g., [:SENSe[1]]). If the root is optional, simply treat a command word
on the next level as the root. For fastest operation, do not send optional data.
•
The colon (:) at the beginning of a program message is optional and need not be
used. Note that eliminating the first colon will result in fastest operation. Example:
•
:stat:pres = stat:pres
•
When the path pointer detects a colon (:) it moves down to the next command level.
An exception is when the path pointer detects a semicolon (;), which is used to sep-
arate commands within the program message (see next rule).
•
When the path pointer detects a colon (:) that immediately follows a semicolon (;),
it resets to the root level.
•
The path pointer can only move down. It cannot be moved up a level. Executing a
command at a higher level requires that you start over at the root command.
Содержание 2520
Страница 250: ...A Specifications ...
Страница 254: ...B StatusandErrorMessages ...
Страница 262: ...C DataFlow ...
Страница 266: ...D IEEE 488BusOverview ...
Страница 281: ...E IEEE 488andSCPI ConformanceInformation ...
Страница 285: ...F MeasurementConsiderations ...
Страница 308: ...G GPIB488 1Protocol ...
Страница 312: ...H ExamplePrograms ...
Страница 317: ...I ContinuousPulseMode ...