Command Syntax
Queries
Queries cause t
he oscilloscope to return status or setting information. Queries
have the structure:
[:]<Header>
[:]<Header>[<Spa
ce><Argument
>
[<Comma
><Argument>].
..]
You can specify a query command at any level within the command tree unless
otherwise noted. These branch queries return information about all the mnemonics
below the specified branch or level.
Headers
Use the HEADer command to control whether the oscilloscope returns headers as
part of the query response. If header is on, the query response returns command
headers, then formats itself as a valid set command. When header is off, the
response includes only the values. This may make it easier to parse and extract the
information from the response. The table below shows the difference in responses.
Table 2-3: Comparison of Header Off and Header On Responses
Query Header Off Header On
TIME?
14:30:00 :TIME “14:30:00”
ACQuire:NUMAVg?
100
:ACQUIRE:NUMAVG 100
Clearing the oscilloscope
You can clear the Output Queue and reset the oscilloscope to accept a new
command or query by using the selected Device Clear (DCL) function.
Command Entry
The following rules apply when entering commands:
You can enter commands in upper or lower case.
You can precede any command with white space characters. White space
characters include any combination of the ASCII control characters 00 through
09 and 0B through 20 hexadecimal (0 through 9 and 11 through 32 decimal).
The oscilloscope ignores commands consisting of any combination of white
space characters and line feeds.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-3
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