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7.2 Communication
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This portion becomes the current path, and can be omitted from the message
immediately following.
③ Delimiter
Depending on transmission direction, the delimiter is as follows.
From computer to 3237/38/39: CR or CR + LF
From 3237/38/39 to computer: CR + LF
(3) Separators
① Command unit separator
Multiple commands can be written in a line by connecting them with a
semicolon";".
Example: FUNCtion 'VOLTage';VOLTage:RANGe 100
Multiple query commands can also be in a line. Response is returned in a
line with each responding data separated by a semicolon";". Writing multiple
commands without inserting semicolons results in text error failing to
complete command execution.
② Separator between command and parameter
Use space" " in command with both command and parameter to separate
command and parameter.
Example: VOLTage:RANGe 100
Compound Command Header Omission
When several commands having a common header are combined to form a
compound command (e.g., :CALCulate:LIMit:UPPer and
:CALCulate:LIMit:LOWer), if they are written together in sequence, the
common portion (here, :CALCulate:LIMit:)
can be omitted after its initial occurrence.
This common portion is called the“current path”(analogous to the path
concept in computer file storage), and until it is cleared, the interpretation of
subsequent commands presumes that they share the same common portion.
This usage of the current path is shown in the following example:
Full expression
:CALC:LIM:UPP 150000;:CALC:LIMit:LOW 120000
Compacted expression
:CALC:LIMit:UPP 150000;LOW 120000
The current path is cleared when the power is turned on, when reset by key
input, by a colon“:”at the start of a command, and when a message
terminator is detected.
Standard command messages can be executed regardless of the current path.
They have no effect upon the current path.
Acolon“:”is not required at the start of the header of a Simple or
Compound command. However, to avoid confusion with abbreviated forms
and operating mistakes, we recommend always placing a colon at the start of
aheader.
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