Manual Keithley 2001 (page 30 of 476) (English)

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Getting Started

2-16 2001-900-01 Rev. K / August 2010

:VOLT:DC:RANG:AUTO ON

The root command for the above example is [:SENSe[1]].

This is an optional command word (as indicated by the

brackets in the table) and need not be used.

Note that there must be a space between the command word

and the parameter. In the above example, there is a space

between the :AUTO command word and the ON parameter.

SCPI command words and common commands are not case

sensitive. They can be sent in uppercase or lowercase. The

commands in Table 2-7 show a combination of upper and

lowercase characters. The uppercase characters identify the

short-form version of the command. For example, all the

following versions of the same program message are valid:

:ARM:LAYER2:SOURCE MANUAL

:ARM:LAY2:SOURCE MAN

:ARM:LAY2:SOUR MAN

:arm:layer2:source manual

:arm:lay2:sour man

:Arm:Lay2:Sour Man

:ArM:LaY2:SouR MaN

Parameters

As previously mentioned, a parameter is separated from the

command word by a space character. The parameter can

consist of one or more data types, such as integer, real,

Boolean, string, name, or list. Some examples follow:

1. :voltage:dc:resolution 4

2. :trigger:delay 0.5

3. :display:window2:text:state on

4. :display:window2:text:data ‘Model 2001’

5. :voltage:dc:average:tcontrol moving

6. :route:scan:internal (@1:3,5)

1. 4  This integer parameter sets the DC voltage

resolution to 3.5 digits.

2. 0.5  This real number parameter sets the trigger delay

period in seconds.

3. ON  This Boolean parameter enables the display of

user text messages on the display, in this case, the

bottom line. A “1” could have been used instead. “OFF”

or “0” disables the function.

4. Model 2001  This string parameter specifies the user

text message. Single or double quotes delimit the

message. Note that the previous command must be sent

to enable the display of user text messages.

5. MOVing  This name parameter specifies the mode of

the averaging or advanced digital filter.

6. (@1:3,5)  This list parameter specifies an internal

scan list for the Model 2001-SCAN. Parentheses are

used to enclose the list of channels. The @ symbol must

precede the first channel in the list. A colon is used as a

separator for the range limits (channels 1 through 3).

Each channel or channel range in the list must be

separated by a comma.

Multiple commands

Multiple commands can be sent in the same message as long

as they are separated by semicolons. For example:

Instead of sending ...

:system:error?

:system:preset

You can send ...

:system:error?;preset

When the above message is sent, the first command word is

recognized as the root command. When the command parser

sees a colon after a semicolon, it resets the path pointer to the

root before processing the next command.

Proper use of the path pointer allows commands in the same

command level to be serviced without having to retype the

entire command path. For example, the command

:ARM:LAYer2:SOURce MANual moves the path pointer

down to the last command level in the path. As a result, the

:count, :delay, and :timer commands and their companion

query commands can be included in the same program

message without repeating the entire path. Some examples

follow:

Instead of sending ...

:arm:lay2:sour man;:arm:lay2:sour?

You can send ...

:arm:lay2:sour man;sour?

Instead of sending ...

:trig:coun 1;:trig:del 1;:trig:tim 1

You can send ...

:trig:coun 1;del 1;tim 1

Notice that the colon for the additional commands is not

included. Remember, when a colon (not preceded by a

semicolon) is seen, the path pointer moves down to the next

command level. For example:

:trig:del 1;tcon:prot asyn

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Keithley 2001 Manual

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